Gewehr 88 Low Pressure -- What Should I Bump It To?
My load for the Gewehr 88 with a bore that slugs 0.318" is as follows:
Winchester case formed from .30-06 Winchester case
0.318" 150 grain spitzer bullet
46.5 grains Varget
Federal large rifle primer
Now, I'm having signs of gas leakage around the neck. I'd like to bump it up a little bit to make that stop, but it's probably due to the "S" rethroating.
I don't remember the upper limit for the 7,92x57J cartridge, or for the rifle. I was thinking 40,000PSI, but am not sure. Could be 45,000 PSI. One is CUP.
I do believe I'll stick with 40,000 PSI though.
I was going to start bumping it a grain at a time, but I'm really not sure when to stop. I know that by the time it shows pressure signs I'll be exceeding the action design.
I'd love me a pressure gun, but since I don't have one, I'll have to take educated approximations from you all.
So, where do you suppose I should stop? What load would max at 40,000 PSI?