7mm prc

[Martin2]

I have a slot for a 7mm prc and have been looking to get one. I have been told by a good friend that there is a few issues with pressure and they need cleaning more than normal something to do with the right tolerances and there is little space for the neck to expand and any carbon build up causes pressure issues quicker than normal has anyone heard anything about this?

 

[angusb1]

I also have an unfilled slot for a 7mm PRC. Watching this thread with interest.

 

[Dave_45]

I am considering a 7mm build

From what I can glean it doesn’t offer anything above and beyond what’s already out there and proven

Other than Hornady backing and the likely availability of parts.

 

[25 Sharps]

I have a slot for a 7mm prc and have been looking to get one. I have been told by a good friend that there is a few issues with pressure and they need cleaning more than normal something to do with the right tolerances and there is little space for the neck to expand and any carbon build up causes pressure issues quicker than normal has anyone heard anything about this?

No idea but probably true, I’ve just ordered a Bergara wilderness in HMR, one of the design features on the 300 is tight freebore, 8 thou from memory. The idea being it aids accuracy with long, high BC bullets, as they can’t yaw as they apparently do with the 300 win mag.

Makes sense they designed the 7 around the same principle.

 

[C h r i s]

I have one, Tikka T3x rebarelled to 7mm PRC by Steve Kershaw, action in an MDT ESS chassis. Shooting 180gn ELDM's at just under 3000ft/sec, Peterstone brass, RS76 powder, CCI large rifle magnum primers. No issues whatsoever, just spectacular accuracy, and with a Dolphin guns muzzlebrake the perceived recoil is down to 223 levels.

 

[NullMac]

right tolerances and there is little space for the neck to expand and any carbon build up causes pressure issues quicker than normal has anyone heard anything about this?

Dunno about the problem but allegedly the chamber specs are a bit tighter on the 'modern' cartridges ie 65CM onwards. More qualified people on here will have a definitive view

 

[C h r i s]

Should be able to work out if there is any truth to this from here: 7mm PRC SAAMI spec

Case OD 8.05mm, chamber ID taper from 8.10mm to 8.08mm - so "tight" but not a jam fit.

 

[scotch_egg]

Some magnums are prone to the dreaded carbon ring. I believe this is due to the type of powder used. I suffered it in my 7mm SAUM, I put it down to the barrel being at the end of life. It’s worth keeping an eye on and scrubbing the neck where it meets the freeboor.

 

[Edinburgh Rifles]

You need to find better friends….

The ENTIRE USP of the PRC range is a tighter freebore tolerance
Commonly found on match and custom rifles that require neck turning.

There is no sudden new regime required
Carbon rings are a thing in many cartridges.
Clean them
Go shoot

Listen to friends less…