MountainDevil54

OK... the first OAL that you gave me was 1.644" Confirm for that was with the w209 in the primer cup and it was siting completly on and against the primer shelf in the cup. You may have to gently tap the primer down snug to get this measurement. Yes - No???

The next measurment with the primer on or close to your firing pin bushing the OAL is 1.651"

So to me it shows that you primer shelf should be .007 higher in the cup to get a snug fit with the w209 primer.

That is so little difference it is hardly worth doing anything.....

Next question... When you are shooting with a standard sub and a stock CVA BP - do you get enough blowback to even worry about. It seems to me that you would be fairly clean.

Since I do not have a break open CVA, I would suggest to you that I would univerally build (shim) the primer cup maybe .010 higher in the pocket to allow all the primers shorter than the W209 to work equally well in that gun. That would also mean anythime you use a Winchester primer you would be crushing the very tip everytime when you closed it and the middle length primers like the Fed and CCI would be very close to sitting on the shelf. But again it goes back you are so close it might not be worth the project.

Next asignment... measure the depth of the primer pocket from the top of the BP to the primer shelf....

I am on the road now but possibly when I get home, i will try to find or order a CVA hex head breech plug take another good look at one. The only CVA BP i MIGHT have is one for the old Fire Bolt.

Do you still have either of those BP's that I thought you got from Saxman1?

The only clear thing that does for me is to assure me that a doulble modified CVA plug should work very well with BH in your gun 100% of the time, actually probably all of your more modern CVA's.

Here is another one of my 2 bit drawings - look at it and see if it makes any sense to you...