My new 300 WSM

rpierce

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Well I finished load development on my new 300 WSM I built myself. I wanted to do a compact setup so I went with a 22" Benchmark carbon barrel since Im running a suppressor. The reamer is set up for 205 gr Bergers but will work for others in that weight class including the 215s. Contrary to popular belief it was easy to get my Defiance XM to feed in a mdt detachable magazine. I moved the hole forward .275 that has the spring go through it. This put more pressure on the front of the follower and would keep the round inline when getting chambered. Feeds flawless and won't go below the feed ramp like people have experienced w this combo. Very first load I tried out of this barrel to break it in shot in the .3s at 100.

After the barrel settled down for velocity I decided to do a powder charge test. Reloader 23 is pushing a 205 berger at 2860 fps with an es of 12 for 10 shots. I didn't hit pressure til 2935 fps. There was another node at 2900 but I didn't wanna be that close to pressure since it was less than a gr from hitting it. Picked the milder 2860 fps node. 4 seating depths later it shot a 3 shot group that measured .195" @ 100 yds. I decided to load 3 more rounds to verify at 580 yds. Heres the group it shot at 580 in a 10 mph wind. 1.5" tall by 3.0" wide. More than happy with it in those conditions.

While breaking the barrel in with a super mild load at 2650 fps I decided to shoot two 3 shot groups in a row at 580 yds. One measured .6" and the other measured 1.2". This cartridge has been about the easiest magnum Ive seen to load for that Ive seen. While breaking the barrel in I tried 3 different neck tensions and seating depths from .015-.060 off. It shot everything 1/2" or better with most being in the .3 moa range.

Im expecting 2000+ round barrel life with awesome accuracy since this will be only shot cold bore. Plugging in the ballistics of a 205 at 2860 youll see its pretty much identical in the wind compared to the 6.5 prc,saum/shermans etc with a 156. However it has 20% more energy at 1000 and way more barrel life. Very easy to keep in tune and minimal throat erosion.

Rifle has the following:

Defiance ANTIX XM length w nitride
Manners LRH
Benchmark 22" 30 cal 10 tw sendero light
Hawkins Bottom metal
Modified MDT magazines
Triggertech Diamond
Thunderbeast Dominus SR Suppressor
Nightforce ATACR 4-20x50 bedded into a set of NF Rings

Rifle weighs 11.0 lbs with optics and suppressor.

www.piercisionrifles.com

313466970_807197663941306_1457136567063510291_n.jpg 314472732_414533827401228_5692274326008312665_n.jpg 313202970_6054268551274518_6398556579460261737_n.jpg 313467281_869690567362380_2110918015395411473_n.jpg 314361126_656246609437361_6817086252814796592_n.jpg 314419891_646610257101572_2879489405317914143_n.jpg 315098564_657304489354756_7675827440283660641_n.jpg 312893738_682124793521632_3496671809972567858_n.jpg 313849266_434633325489522_8238164695658300397_n.jpg

 

Spreedizzle

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I'm not a DBM guy.....but that is a damn fiiiiiiine looking rifle otherwise. Especially great job on the groupings. Never done any of the Short Mags before, but you definitely have my interest peaked.
 

Jud96

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I saw this earlier and commented, but I’ll say it again. Sweet right and great work as always Ryan!
 

Ladd

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Pretty sweet looking rifle. Very nice. That caliper needs some love too. ;)
 

rpierce

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I'm not a DBM guy.....but that is a damn fiiiiiiine looking rifle otherwise. Especially great job on the groupings. Never done any of the Short Mags before, but you definitely have my interest peaked.
thanks. this rifle will be what I grab for 90% of the hunts I go on from here on out. I stopped using hinged floor plates a few years ago. Ive had several instances where having another magazine to throw in resulted in more game getting shot in that sitting. Depredation deer hunts where alot are getting shot in a very short amount of time. Cant be single loading cause you ran out of ammo in the box. Vs throw another 5-7 round magazine in and let her rip LOL.
 

rpierce

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Pretty sweet looking rifle. Very nice. That caliper needs some love too. ;)
Thanks. I leave that set of calipers down at the 580 yd berm. Got tired of forgetting a pair when I would go down to measure a group LOL
 

Spreedizzle

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thanks. this rifle will be what I grab for 90% of the hunts I go on from here on out. I stopped using hinged floor plates a few years ago. Ive had several instances where having another magazine to throw in resulted in more game getting shot in that sitting. Depredation deer hunts where alot are getting shot in a very short amount of time. Cant be single loading cause you ran out of ammo in the box. Vs throw another 5-7 round magazine in and let her rip LOL.
Never been on a hunt like that.....but feels like an awfully fun way to contribute to the ammo shortage!!! ;)
 

Daniel

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wow! great looking stick!
 

rpierce

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Never been on a hunt like that.....but feels like an awfully fun way to contribute to the ammo shortage!!! ;)
its not the worst way to contribute to the shortage that ive seen haha. quick way to fill the freezer. generally they don't run off since im running a can. Can kill quite a few before they figure out whats going on.
 

JoshHaker

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Very nice!

300 WSM we keep hearing the same message over and over. Easy. I just may have to try one.
 

md99cobra

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Nice looking stick Ryan. I think this will be my next cartridge I build around. I’ll probably stick with a 20” barrel though and run the 185 Juggernaut.


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6.5wsm

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they will all be high plains that are coming in a few weeks.
thanks. this rifle will be what I grab for 90% of the hunts I go on from here on out. I stopped using hinged floor plates a few years ago. Ive had several instances where having another magazine to throw in resulted in more game getting shot in that sitting. Depredation deer hunts where alot are getting shot in a very short amount of time. Cant be single loading cause you ran out of ammo in the box. Vs throw another 5-7 round magazine in and let her rip LOL. Great looking. Rifle
thanks. this rifle will be what I grab for 90% of the hunts I go on from here on out. I stopped using hinged floor plates a few years ago. Ive had several instances where having another magazine to throw in resulted in more game getting shot in that sitting. Depredation deer hunts where alot are getting shot in a very short amount of time. Cant be single loading cause you ran out of ammo in the box. Vs throw another 5-7 round magazine in and let her rip LOL.
Hey. That’s a great looking rifle. I’m a WSM. Guy I have 3 diff. Ones built. 257 a 6.5. And. 300. All. Built. On the newer mod 70. Actions.that are Blue printed Your project. With DBM. Mag and your rework. Leads to this question. Have you ever put a DBM. Mag and bottom metal on a factory. Mod 70. Action. ?

 

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