Welcome! Have you ran any of your loads through a chronograph? I've never loaded anything heavier than 120 grains in my 6.8, and I'm interested in your velocity. The longer barrel of your Stag should give pretty decent numbers.
try the 120 grain CBB for superior hunting bullets or if you are set with 130 grain try loading long with the 130 VLD or fusion pulls, loading long and using LVR powder you can achieve 2800fps with those 2 bullets I listed in 20" barrels--X-man started a thread on loading long and he and Yam have developed great loads with the 130 vld and fusion303 HUNTER, no i have not ran them though a chrono but with what I've found here, I'm thinking middle 23's to upper 23's close to 2400 fps. Info from post#471451.