Originally Posted by
cobullseye
Mosin Nagant
barrel slugged, bore .299/.300, grooves .313. Really clean, smooth, shiny. Shoots jacked ammo very well.
Brass cases boxer primed. After firing the inside of the case mouth is .308. Only knock out the spent primer, do not full length or neck resize.
Lee 178 grain bullet, out of range scrap, fluxed, dropped on a towel, at a temperature near frosty to get to fill out, air cooled, left in mold long enough to get the scar on the back of the bullet to be round, not scraped. They drop .311 to .313, not sized, pan lubed with liquid Alox. I have tried as cast and Beagled the mold up a couple thousandths, does not seam to matter much. I did size in a 308 sizer a batch of these, tried them same results. Also added gas checks to the above, same results.
Also tried Lee TL314-90-SWC 90 grain bullet, 90 grains, with 6.9 grains of H110. Same results.
Loaded with a Lyman M dies, flares the mouth a little to get bullet started. Lee factory taper crimp die just a tiny bit to push bell back.
Powder 13 grains N110, no filler, WLR primer. Gone up and down in powder, seams the sweet spot.
Best I can do is 2.3” at 25 yards off a rest
I think it should shoot better, What else can I try? I was hoping for 2-3 MOA, is that reasonable?