Maybe powder

Watch bullet velocity with Berry's Spire points!

2000 FPS is the max for Berry's 123 Spire Point. Using most published data will typically push the bullet well past 2000. I found the best results with IMR 4198, 23.1 grains which maxed out at around 2000 FPS out of a 16-1/2" barrel. The best group out of the Ruger American Ranch 7.62X39 was with 22.0 grains of IMR 4198, which resulted in 1900 FPS muzzle velocity.

Two bits...
 
Thanks everyone !!!!
I just received my RCBS dies today and the mandrel in the die was .307 and the other one was also a .307.
Contacted them now I gotta wait on my .310 mandrel to arrive
 
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