Trying to get some 500 grain loads going...

[Rikky Lee]

Results time.

All loads are 4198 and all velocities average. No test for accuracy.

a. 20 grains: 975fps

b. 19 grains: 925fps

c. 18 grains: 900fps

d. 17 grains: 840fps

The steep drop off in velocity at the 17 grain mark is very telling of a load that needs more love.

Looking like 21 grains will sit in the 1025fps mark and 21.5 about the 1050fps mark.

Penetration test - try over 2 feet of wet clay before I got bored digging!