25 Creedmoor Info Thread

ABC1000

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I am waiting to order my 25 CM barrel and will be shooting Berger 133s and 135s exclusively but bought enough that I’ll have enough to shoot this and the 25 SST barrel I have coming out. Im trying to figure out what ideal freebore will be but I will be running this out of a range gun 28” 7twist 6 groove that will be in a switch barrel setup. They have one in stock now I could get here in a couple of weeks but need to make sure freebore will work. They say it’s reamed for 120 grain bullets plus and it looks like it’s .2575” FB. I think my 25 SST barrel is going to be a .290” but need to verify as I’m away from home.

 

ABC1000

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Here’s a copy of the reamer diagram. Any thoughts on whether this will work with the 133 & 135 Berger’s?
 

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JTB

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It looks like your freebore with this reamer is .100”. I have been using the reamers designed by blackjack with a .115” freebore and they work well with the 133/135 Bergers. The reamer you illustrated should work fine. Could give you an extra .015 of clearance, vs blackjack, in your magazine depending on your ideal seating depth and slightly less powder capacity. I am .015” off lands with the 135gr. Honestly that is what I started with and had no reason to change as accuracy is outstanding at 2870 fps from my 24” M24 barrel
 

ABC1000

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It looks like your freebore with this reamer is .100”. I have been using the reamers designed by blackjack with a .115” freebore and they work well with the 133/135 Bergers. The reamer you illustrated should work fine. Could give you an extra .015 of clearance, vs blackjack, in your magazine depending on your ideal seating depth and slightly less powder capacity. I am .015” off lands with the 135gr. Honestly that is what I started with and had no reason to change as accuracy is outstanding at 2870 fps from my 24” M24 barrel
Thank you! I don’t pretend to know what im
Doing looking at a reamer diagram. Thanks! I’ll order the barrel!
 

ABC1000

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It looks like your freebore with this reamer is .100”. I have been using the reamers designed by blackjack with a .115” freebore and they work well with the 133/135 Bergers. The reamer you illustrated should work fine. Could give you an extra .015 of clearance, vs blackjack, in your magazine depending on your ideal seating depth and slightly less powder capacity. I am .015” off lands with the 135gr. Honestly that is what I started with and had no reason to change as accuracy is outstanding at 2870 fps from my 24” M24 barrel
Thank you! I don’t pretend to know what im
Doing looking at a reamer diagram. Thanks!
 

ABC1000

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I’m hoping that the 28” gives a little more velocity bit I’m excited to go 25 CM. I’ve thought about this for a couple of years now.
 

ABC1000

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Anybody know what bushing will be best for 6.5 CM Lapua necked down?
 

ABC1000

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I just measured the Lapua brass and you’re spot on at about .014” thickness.

Also, FWIW I just heard back from Forster as I run Forster on 6.5 CM (Redding on 6cm) but here’s there response seating stem:

Thanks for reaching out, my recommendation is to use the stem supplied with he 6.5 CM for this application. It is going to have plenty of clearance for the longest of bullets but as opposed to switching to the 257 stem it is going to stay supported in the bullet channel. I don’t think any additional stem will be needed for this application.
 

ABC1000

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The main reason I use SRP brass is due to the added brass in the case head vs the LRP cases, ie, primer pockets hold up longer and to higher pressures. Some say SRP may be a little more consistent but not sure that theory would hold up. The Lapua SRP brass has been the most durable under higher pressures in my experience (I understand Alpha has a new line of more durable brass but have yet to get my hands on any).
I have recently moved to Preferred barrels. They are very straight and have been very resistant to copper fouling. I like the lighter Hart barrels for hunting. I used to be a cut rifling only guy but the newer button barrels have been impressive lately.

The only negative I’ve heard of SRP is that in extreme cold (sub zero I believe) consistent ignition of small rifle primers can become an issue. I hunt coyotes in what I’d call extreme conditions and haven’t seen that myself but have heard from several people that believe that’s the case.
 

ABC1000

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It looks like your freebore with this reamer is .100”. I have been using the reamers designed by blackjack with a .115” freebore and they work well with the 133/135 Bergers. The reamer you illustrated should work fine. Could give you an extra .015 of clearance, vs blackjack, in your magazine depending on your ideal seating depth and slightly less powder capacity. I am .015” off lands with the 135gr. Honestly that is what I started with and had no reason to change as accuracy is outstanding at 2870 fps from my 24” M24 barrel
Per barrel manufacturer it’s .116” that’s what was throwing me off.

 

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