Another 25PRC

mullmann

Active member
Joined
May 11, 2013
Messages
232
Reaction score
213
Points
43
Location
Chandler, Az
My 25 caliber rifle project started last August when I ordered my second barrel from Carbonsix. I was originally going to build a 25SST, but changed my mind about a month ago to build off a long action. I sold the stock, bottom metal and magazine and acquired the long action components.

I am waiting for my second Terminus action to arrive and then the action and barrel will be sent off to Alex Wheeler. Once I get the barreled action back it will go to Axisworks to be completed. This rifle will look very similar to the 300 Norma I built last fall. I am going to run my Thunderbeast ultra 9 gen 1 on this rifle.

Terminus Kratos
Carbonsix sendero 22” 1-7 twist
Mesa Precision arms altitude, glacier
Hawkins bottom metal black anodized
Wyatts CFE 13
Triggers tech special
SRS rail
Hawkins medium rings
NF NX8 4-32 SFP

I have acquired the following components for this rifle.

Lapua 6.5PRC brass
Berger 133GR elite hunter
VV N565
CCI br2 primers

I am hoping to have the rifle finished by October.

 

jla74

Member
Joined
Jan 18, 2022
Messages
30
Reaction score
12
Points
8
My 25 caliber rifle project started last August when I ordered my second barrel from Carbonsix. I was originally going to build a 25SST, but changed my mind about a month ago to build off a long action. I sold the stock, bottom metal and magazine and acquired the long action components.

I am waiting for my second Terminus action to arrive and then the action and barrel will be sent off to Alex Wheeler. Once I get the barreled action back it will go to Axisworks to be completed. This rifle will look very similar to the 300 Norma I built last fall. I am going to run my Thunderbeast ultra 9 gen 1 on this rifle.

Terminus Kratos
Carbonsix sendero 22” 1-7 twist
Mesa Precision arms altitude, glacier
Hawkins bottom metal black anodized
Wyatts CFE 13
Triggers tech special
SRS rail
Hawkins medium rings
NF NX8 4-32 SFP

I have acquired the following components for this rifle.

Lapua 6.5PRC brass
Berger 133GR elite hunter
VV N565
CCI br2 primers

I am hoping to have the rifle finished by October.
Sounds like a nice project
 

J2shooter

Well-known member
Joined
Jan 10, 2020
Messages
1,255
Reaction score
1,471
Points
113
My 25 caliber rifle project started last August when I ordered my second barrel from Carbonsix. I was originally going to build a 25SST, but changed my mind about a month ago to build off a long action. I sold the stock, bottom metal and magazine and acquired the long action components.

I am waiting for my second Terminus action to arrive and then the action and barrel will be sent off to Alex Wheeler. Once I get the barreled action back it will go to Axisworks to be completed. This rifle will look very similar to the 300 Norma I built last fall. I am going to run my Thunderbeast ultra 9 gen 1 on this rifle.

Terminus Kratos
Carbonsix sendero 22” 1-7 twist
Mesa Precision arms altitude, glacier
Hawkins bottom metal black anodized
Wyatts CFE 13
Triggers tech special
SRS rail
Hawkins medium rings
NF NX8 4-32 SFP

I have acquired the following components for this rifle.

Lapua 6.5PRC brass
Berger 133GR elite hunter
VV N565
CCI br2 primers

I am hoping to have the rifle finished by October.

I'll follow along. Sounds great 👍.
 

mullmann

Active member
Joined
May 11, 2013
Messages
232
Reaction score
213
Points
43
Location
Chandler, Az
I necked down and prepped 101 pieces of Lapua brass today. I love when you get to the bottom of the the Lapua box and there is one extra piece. First time I have necked down brass and it went nice and easy. I ordered 300 pieces of brass. I am going to wait and see how this rifle performs, but with all the components I have I am thinking a 6PRC with a 109 or 115 Berger would be fun. One project at a time though. Here is a picture of all the pieces minus the action and a picture of the Norma I built last year for a comparison of how similar they will be.
 

Attachments

  • EA64DD62-516E-425A-B80F-7AEE2B5C8FC7.jpeg
    EA64DD62-516E-425A-B80F-7AEE2B5C8FC7.jpeg
    79.4 KB · Views: 56
  • 9FF0B589-966F-4C0A-82AD-108EBA236E3C.jpeg
    9FF0B589-966F-4C0A-82AD-108EBA236E3C.jpeg
    68.5 KB · Views: 54

mullmann

Active member
Joined
May 11, 2013
Messages
232
Reaction score
213
Points
43
Location
Chandler, Az
I would definitely try to find a deal on steel barrel if I did that. Not paying for a carbon barrel for short barrel life.
 
Last edited:

mullmann

Active member
Joined
May 11, 2013
Messages
232
Reaction score
213
Points
43
Location
Chandler, Az
Credit card got hit for my action. Hopefully it will get shipped this week. Barrel will hopefully be back this week or next from straight jacket. Once those parts arrive it’s off to the gunsmith for bedding, assembly and cerakote. I loaded up the rounds last week and they just need to be set to final seating depth once I measure the rifle. I also switched to ADG brass.
 

XTREMHTR16

Well-known member
Joined
Sep 24, 2017
Messages
290
Reaction score
253
Points
63
Location
Indiana
I’ve got a bunch of Lapua PRC brass, a 25 might be fun. Does it get you anything over a 25-284 or a 25 SAUM?
 

mullmann

Active member
Joined
May 11, 2013
Messages
232
Reaction score
213
Points
43
Location
Chandler, Az
I’ve got a bunch of Lapua PRC brass, a 25 might be fun. Does it get you anything over a 25-284 or a 25 SAUM?
Based on load data from unknown munitions website for the 6.5 prc, 6.5 saum and 6.5-284 with same bullet the saum would be a few FPS faster and the 284 would be 100 FPS slower. But that is purely off 6.5 data.
 

mullmann

Active member
Joined
May 11, 2013
Messages
232
Reaction score
213
Points
43
Location
Chandler, Az
Picked up the 25PRC today. I just need to mount the NX8. It is almost identical to the 300 Norma I built last year. The stock texturing and color is quite a bit different between the two mesa stocks. Hopefully the kratos runs as smooth as the Zeus.

Edit: I got the scope mounted and the finished barrel length came out to 22.25”.
 

Attachments

  • B559B521-17C5-4C74-B332-DBA8EB6B2797.jpeg
    B559B521-17C5-4C74-B332-DBA8EB6B2797.jpeg
    86 KB · Views: 66
  • 564DD201-9C13-43D4-A9D6-EE1EB1916D0F.jpeg
    564DD201-9C13-43D4-A9D6-EE1EB1916D0F.jpeg
    77.8 KB · Views: 67
  • 024E2D06-A819-4646-A622-2DB79B5D5263.jpeg
    024E2D06-A819-4646-A622-2DB79B5D5263.jpeg
    82.8 KB · Views: 54
Last edited:

mullmann

Active member
Joined
May 11, 2013
Messages
232
Reaction score
213
Points
43
Location
Chandler, Az
I don’t have a modified case or a fired case so I started long and kept seating the bullet deeper until I got the bolt to close with ease. Measurements came to CBTO 2.260 the COAL is 2.920. Shorter then I would have liked but it will work.
 

Attachments

  • AA1A88A0-1902-4F97-A7B1-EB708D81C039.jpeg
    AA1A88A0-1902-4F97-A7B1-EB708D81C039.jpeg
    94.1 KB · Views: 38
Last edited:

mullmann

Active member
Joined
May 11, 2013
Messages
232
Reaction score
213
Points
43
Location
Chandler, Az
I went out this morning to do a pressure test and check velocities. I’m using new ADG brass with N565 and BR2’s.

57.5 was the tightest with velocities of 3035 and 3017. 58 might be the slightest bit of pressure with velocities of 3044, 3061, 3065 and 3067. 58.5 had stiff bolt lift.

I had one round that would not chamber. When I got home I measured to the shoulder and it was .002 over the the longest of my fired brass. I found two other pieces of my 100 that are also long.

I loaded up 57.2, 57.5, 57.8 and 58 to check next weekend.

Hopefully I can find what I am looking for and I can fine tune a load after that.
 

mullmann

Active member
Joined
May 11, 2013
Messages
232
Reaction score
213
Points
43
Location
Chandler, Az
When I got this rifle I did not have a modified case so I waited until I could close the bolt on a round and -.010. Pressure test seemed fine, but today when I shot a 100 yard OCW some rounds seemed to show signs of pressure.

I came home and after destroying two cases I was able to make a modified case. It turns out I was loading exactly where the lands are. 2.050 CBTO.

I loaded the same weights as I shot today and this time I loaded them -.010 off. I’m going to reshoot them and see how they perform.
 

Attachments

  • E38DD43B-48BD-4988-B6B4-1E79CC356BF0.jpeg
    E38DD43B-48BD-4988-B6B4-1E79CC356BF0.jpeg
    379.1 KB · Views: 39

mullmann

Active member
Joined
May 11, 2013
Messages
232
Reaction score
213
Points
43
Location
Chandler, Az
This rifle now has 49 rounds down the barrel. I went today and shot the target pictured below with my suppressor mounted. These are -.010 off the lands. Any ideas on what to shoot when I go back?
 

Attachments

  • A679E342-3260-4588-9DF6-3628A544B2CE.jpeg
    A679E342-3260-4588-9DF6-3628A544B2CE.jpeg
    296.9 KB · Views: 61

Ladd

LRO Field Editor/Precision Hand loading Specialist
Joined
Mar 17, 2019
Messages
6,544
Reaction score
8,041
Points
113
Location
Utah
It appears to me that 57 and 57.2 are right in the middle. 57.5 looks to be really good with respect to the group but the last before the POIs start to change and so close that I would not continue forward with that.
 
Last edited:

hokiepride44

Well-known member
Joined
Apr 18, 2021
Messages
264
Reaction score
397
Points
63
Location
Virginia
If it were me, and you have access to a 600 or longer range, I would do a two round ladder at 56.8, 57, 57.2 and 57.4 and then do seating at the tightest vertical from those.

If you don’t have access, do as @windypants said and tune seating at 57.2.
 

mullmann

Active member
Joined
May 11, 2013
Messages
232
Reaction score
213
Points
43
Location
Chandler, Az
It appears to me that 57 and 57.2 are right in the middle. 57.5 looks to be really good with respect to the group but the last before the POIs start to change and so close that I would not continue forward with that.
My only thought with the 57.5 was to try 57.4 and 57.6 and see where the 57.6 goes.
 

mullmann

Active member
Joined
May 11, 2013
Messages
232
Reaction score
213
Points
43
Location
Chandler, Az
If it were me, and you have access to a 600 or longer range, I would do a two round ladder at 56.8, 57, 57.2 and 57.4 and then do seating at the tightest vertical from those.

If you don’t have access, do as @windypants said and tune seating at 57.2.
I want to find a load before I go back to Michigan in a few weeks for deer season. While I am there I will have access to farm fields that if they have the crops down I could shoot a little over 900 yards and easily 3,4,5 or 600 yards. With the suppressor it wouldn’t effect the deer hunting if I went out around 12 to test.
 

mullmann

Active member
Joined
May 11, 2013
Messages
232
Reaction score
213
Points
43
Location
Chandler, Az
I would reshoot the 57.2 and do seating tests with it. I think it could be the winner. 57 is tight as is the 57.5, so good chance the next 57.2 would be as well or you could shoot 57.3 too and all 3 have the same POI
I have 3 more days I can go to the range before I leave due to my busy work schedule. That should be enough time to fine tune it.
 

mullmann

Active member
Joined
May 11, 2013
Messages
232
Reaction score
213
Points
43
Location
Chandler, Az
In the past I have never done seating depth testing. I probably should or could have, but all my other rifles have shot well at -.010 off so I never messed with it.

I am going to reshoot 57.2, shoot 57.3, 57.4, reshoot 57.5 and shoot 57.6. Once I get those results I will post and do some seating depth testing if that’s what the consensus is.
 

windypants

Well-known member
Joined
Jan 1, 2022
Messages
350
Reaction score
256
Points
63
Location
Foothills of the Snowy Mtns., Montana
I've gotten really lost chasing a lucky group that wouldn't repeat, although 57.5 isn't a lucky group because it is in your node. My very limited experience is that seating depth will make 57.2 group like that. Also consider that if you shoot too much now, you might be in the middle of barrel speed-up about the time you are ready to go hunting. If you tune seating depth now, it should only take a narrow OCW to get to the middle of your node again later. Just my .02. Good luck!
 

mullmann

Active member
Joined
May 11, 2013
Messages
232
Reaction score
213
Points
43
Location
Chandler, Az
I've gotten really lost chasing a lucky group that wouldn't repeat, although 57.5 isn't a lucky group because it is in your node. My very limited experience is that seating depth will make 57.2 group like that. Also consider that if you shoot too much now, you might be in the middle of barrel speed-up about the time you are ready to go hunting. If you tune seating depth now, it should only take a narrow OCW to get to the middle of your node again later. Just my .02. Good luck!
Thanks for the info. Seating depth testing may be in my future. Not something I have done before, but I will definitely go that route if I need to.
 

Lancetkenyon

LRO Editor and Precision Rifle Specialist
Joined
Aug 29, 2017
Messages
986
Reaction score
1,852
Points
93
Location
AZ
My only thought with the 57.5 was to try 57.4 and 57.6 and see where the 57.6 goes.
This is where I would be looking for a hunting rifle. 57.3, 57.4, 57.5, 57.6 to check repeatability and POI/group/ES.
 

mullmann

Active member
Joined
May 11, 2013
Messages
232
Reaction score
213
Points
43
Location
Chandler, Az
I went to the range Wednesday and right away it was apparent the rifle did not like to be dirty. The poi’s were the same but the groups opened way up. I went home and gave it a good cleaning.

I went out today and the wind was 4-12mph right to left. I started by shooting two 57 foulers and one 57.2 fouler. After 57.2 I grabbed the 57.4 so those were shot before the 57.3. I definitely need to get a cover for the suppressor. Even waiting in between shots I am getting a lot of shimmers.

Not sure where I want to go from here.
 

Attachments

  • 47FBE910-7718-4D56-B318-5639E2176F64.jpeg
    47FBE910-7718-4D56-B318-5639E2176F64.jpeg
    293.6 KB · Views: 18

mullmann

Active member
Joined
May 11, 2013
Messages
232
Reaction score
213
Points
43
Location
Chandler, Az
57.3 are almost the same poi’s from 10/26 and 10/29. 57.5 has been about the same all three times I have shot.
 

Attachments

  • 984BE607-226D-48FF-821A-3E9A9B0467CE.jpeg
    984BE607-226D-48FF-821A-3E9A9B0467CE.jpeg
    333 KB · Views: 10
  • 6D953C48-F624-44CB-8513-CF8EB391AEF5.jpeg
    6D953C48-F624-44CB-8513-CF8EB391AEF5.jpeg
    347 KB · Views: 12
  • 38A62A09-E45B-4E3E-94E9-2D16AB728B55.jpeg
    38A62A09-E45B-4E3E-94E9-2D16AB728B55.jpeg
    323.7 KB · Views: 12
  • 9CC276B7-F382-446B-ACBE-8216DC265039.jpeg
    9CC276B7-F382-446B-ACBE-8216DC265039.jpeg
    333.8 KB · Views: 12
  • A17F7F52-4E18-4C8C-8E64-516C994101ED.jpeg
    A17F7F52-4E18-4C8C-8E64-516C994101ED.jpeg
    334.5 KB · Views: 9

Ladd

LRO Field Editor/Precision Hand loading Specialist
Joined
Mar 17, 2019
Messages
6,544
Reaction score
8,041
Points
113
Location
Utah
I still think 57.5 is too close to the edge. I would go with 57.3 or shoot these at distance over 500 yards to really flesh it out. After a while, shooting 100 yards becomes too much. Your rifle may even act differently making a load stand out or it will fall apart.
 

mullmann

Active member
Joined
May 11, 2013
Messages
232
Reaction score
213
Points
43
Location
Chandler, Az
I still think 57.5 is too close to the edge. I would go with 57.3 or shoot these at distance over 500 yards to really flesh it out. After a while, shooting 100 yards becomes too much. Your rifle may even act differently making a load stand out or it will fall apart.
I am taking rounds with me to Michigan to shoot at longer distances. I will be able to shoot at least up to 600. Maybe up to 960.
 

Ladd

LRO Field Editor/Precision Hand loading Specialist
Joined
Mar 17, 2019
Messages
6,544
Reaction score
8,041
Points
113
Location
Utah
I am taking rounds with me to Michigan to shoot at longer distances. I will be able to shoot at least up to 600. Maybe up to 960.
Perfect. You know what to try. I think you are there in my opinion. All you need to do is check it at distances you intend to shoot game and verify it at a few different yardages.
 

mullmann

Active member
Joined
May 11, 2013
Messages
232
Reaction score
213
Points
43
Location
Chandler, Az
Broke the rifle in today. Second day of Michigan rifle deer season. 280 yard shot on a doe. The 133 Berger did plenty of damage to the lungs. Very happy with the bullet performance. I have had lots of deer from 4-600 yards so I should get a chance for a longer one. I wanted a shorter shot for the first one.
 

Lynn31344

New member
Joined
Jun 13, 2021
Messages
8
Reaction score
2
Points
3
When I got this rifle I did not have a modified case so I waited until I could close the bolt on a round and -.010. Pressure test seemed fine, but today when I shot a 100 yard OCW some rounds seemed to show signs of pressure.

I came home and after destroying two cases I was able to make a modified case. It turns out I was loading exactly where the lands are. 2.050 CBTO.

I loaded the same weights as I shot today and this time I loaded them -.010 off. I’m going to reshoot them and see how they perform.
You probably already know this, but thought I would mention. I’ve been getting CBTO measurements with the bullets I feel certain I will be using before I screw the barrel on. Later when I check with an OAL gauge that reading is always 3-5 thou longer. I saw it on a Mark Gordon YouTube video. I’m chasing this thread because I built 2 25 CMs & am not happy with my velocities. Thanks for posting your build.

 

Forum Sponsors

Top