Back again after a fairly long absence! I am shooting my 7mmWSM with 162gr Hornady A-Max projies. Nice and accurate - if they reach the target! Was using 64gr REL22 which is 2gr above book max. so I changed to 70gr AR2225 (Retumbo, REL25)which is a half grain below max. Bullets still blowing on the way to the target. Barrel is 500 rounds old and 1 in 9 twist stainless steel. Normally clean the barrel with Ed's Red with ammonia but checked out if there was any copper still in it by using Sweets 7.62 - no copper fouling. Happens more in warmer weather. I am using Federal large rifle magnum primers, cases are annealed and neck turned. Any help will be appreciated!!