thought you might like to see this
Category: .284 7mm
Product: 7MM .284 139 gr GMX®
Posted: Aug 9, 2012
Here is a 3 shot group at 100 yds sand bags from a Ruger M77 in 7x57 Mauser that is 30 years old.
139 gr GMX, 46.5 gr win 760 powder, and a federal Gold medal match 210 primer winchester cases.