I am fairly new at this smokeless PP thing. Out of a 1-13" twist Krieger barrel (.308 Winchester) the best I've done with PP so far, with a fair amount of work, is 2-2.5 MOA. I'm sizing the NOE copy of the Saeco #315 down to .301", though I haven't proven to myself there is a significant difference between sizing before patching or just patch as cast and then ram it through the push thru sizer. I'm sizing to .301" using the NOE push thru system, FYI if you order an airgun body sizing die they have a larger mouth radius than the .300/.301" nose sizing does. Best result at 100yd so far, 41.0gr N140, chronographed AVG 2428fps:
And this is with fire formed, neck sized Lapua brass and CCI BR primers.
Looks pretty decent until you compare it to the ladder test... My experience this far has been at higher velocity very minor changes have a huge effect on accuracy:
FWIW any time I've tried patching less than 100% bearing surface at higher velocity the accuracy is non existent; this gun has standard throat so I have to seat very deep:
I can turn out groups like the top target with that PP load about 75% of the time but plagued by flyers. I'm still trying different kinds of paper and patch lube. Do I think much better can be done? Yes. Just haven't gotten there myself. For reference This gun will easily shoot under 1" 5 shot groups @ 100yd on demand with jacketed bullet handloads.
*Edit- pictures are rotated for some reason. On the larger target the left column is sized .309" and the right .311". Loads from 38-41gr N140 with charge increasing further down. The 40gr group with both sizes was inexplicably enormous.