I just tried Dastardly's Big Lube bullets in my 5 1/2" stainless ROA today. I lubed them with GreenSpeed, and sized them to .454" like Dick suggests. I settled on 30 grns 777 for a powder charge. They grouped GREAT, averaging about 1.5" @ 25 yds from a rest, (better than Lee's boolits), although POI was a good 3" above the RB groups, I just used a 6 O'clock hold to hit the Bullseye! The grease groove is nice and deep/wide and showed a lube star after 12 shots. I see them as an excellent choice for hunting. Try 'em, you'll like 'em!