Powder for short 20 PPC

J

jeffsvice

Guest
Just got my short .20 PPC (-.150) and dies from the smith. A little powder testing and chrongraphing yeilded the following. Shooting 40 bergers, 3-shot averages.

N-133 20.5 gr - 3172 fps
N-133 23.6 gr - 3606 fps
N-133 25.0 gr - 3744 fps (gotta tap the case to keep this one from spilling over - about all it'll hold.)

H-4198 21.0 gr - 3483 fps
H-4198 21.5 gr - 3569 fps
H-4198 22.0 gr - 3670 fps
H-4198 22.5 gr - 3717 fps (2 shots only, popped the primer - don't we feel smart when we wear shooting glasses while working up loads!?)

I want to try something with a burn rate between these two powders. According to Hodgdon, H-322 is slightly faster than N-133, but all the other charts say it's slower than N-133. (The other charts also rank H4198 slower than N-133 but that's obviously wrong.) According to my search, this has been kicked around on the forum in the past... Is there a trustworthy powder burn rate chart out there?

Any powder recommendations from others that have tinkered around with small cases?
 
I think you can try H322 at a volume similar to H4198 and be OK. Start low just like what you've done already. Current H322 is a bit slower than H4198.
 
I've shot better

small of 0.127, large, just over an inch. I did a barrel break-in routine or practiced my cleaning skills, whichever you prefer. Fooled around with the scope, tightened rings, all the stuff you do with a new rifle. Left the bullets hard in the lands to sharpen up the fireforming, left the shoulders with the bolt closing hard...so I wasn't really hoping to get much on groups.

I've got 7 X 3-round groups of H-322 loaded in half-grain increments for tomorrow's range trip - backed out the bullets to just touching so maybe I'll get something useful then...

Thanks all for the replys
 
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