Troubleshooting reload for 300 Winchester
Hey, all! I could use some comments to help troubleshoot a new Ramshot load for a 300 Winchester.
There was no IMR 4350 available when I went to buy more power, so I am trying some Ramshot Magnum. I put 80 grains behind a 168 gn Hornady Match HPBT, with a CCI-250 primer, and just tried firing it out of my Wincehster Model 70 hunting rifle (which I've had for 35 years, Leopold 4x scope). I can normally group around 1.5" at 100 yd with the gun, but that load was all over the place, at least a 6" diameter circle with 5 shots, both left-right and vertical stringing. Just for kicks (and to make sure I wasn't having a bad day) I put three of my old 180 grain Normas ahead to 72 grains to IMR 4350 (same primer), and got the expected 1.5" group.
Any ideas what could be going wrong?