What Length in the 7mm PRC

[Hard Head]

Just loaded up some 7mm PRC with 180 ELD Match with Staball HD,it will be shot out of my Bergara HMR wilderness, what length would you start with have 27 shells loaded with 3 sets of different powder charges and want to try some seating depths. My Hornady bullet o/l gauge shows the 180 hits at 3.350". Pete

 

[Dmagna]

.020 off the lands

 

[K.E.C.]

If you have mag.length, I would start at
10thou. Or max mag length.

 

[crashlanding]

Delete

 

[Hard Head]

If you have mag.length, I would start at
10thou. Or max mag length.

It has a inside max length of 3.780

 

[MagnumManiac]

Start at touching and move away in .010" increments, 5 of each measurement with 3 shot groups should tell you which is best.

Cheers.

 

[MagnumManiac]

To add, if those depths do not gel, use the Berger seating depth test.
Personally I've only ever needed to use it on a 3.34" mag box with a cartridge requiring 3.6"+ to reach the rifling due to those above restrictions, in the end I just loaded to .010" under max mag box length and was happy enough. I know you have no restriction, but you might just find tighter groups with more jump than .050"…it happens.

Cheers.

 

[Hard Head]

Thanks, I am not going to try and shoot it for pure velocity, I want accuracy, like a old gentleman once said "Only Accurate Rifles Interest ME"!! Besides speed burners are costly in noise, recoil and very hard on barrels and are annoying to other shooters at the range. When you sit at a bench trying to just touch the trigger and very lightly put pressure against it and a huge blast from a tank brake hits you its annoying . Macho is putting 5 shots at 1000 yards in a 4" group , only a very accurate rifle and a well trained Rifleman will do that, Pete

 

[deputyrpa]

This is too close to the lands with a hot charge and 4x fired Hornady brass.

 

[Phil Rizzo]

That brand brass doesn't appear to handle pressure well.
I've seen primers come out, but haven't had one vent before .
Not yet anyhow

 

[quigley257]

This is too close to the lands with a hot charge and 4x fired Hornady brass.

Winchester primers?

 

[deputyrpa]

Winchester primers?

Winchester Large rifle. Not magnums.

 

[deputyrpa]

That brand brass doesn't appear to handle pressure well.
I've seen primers come out, but haven't had one vent before .
Not yet anyhow

That was my first.

 

[quigley257]

Definitely a primer problem, not brass problem. Winchester large rifle primers are notorious for leaking and pitting bolt faces. Winchester will replace them.