22-284

I don't know about the "short" you mention, but in a full blown 22-284 I was burning 50.0 grains of RL25 with an 80 grain MK.
I also reached 53 grains of N170, and 51 grains of H1000.

Muzzle velos from a 29" barrel were from 3550 to 3675.
 
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