I have a marlin model 30AW in 30-30, it likes the 170 grain Remington Core-lokt bullets the best asfar as accuracy on paper I can hold 1 inch groups with open sights at 100 yards. It also doesn't do to bad with a 170 grain winchester silvertip shoots about a 1 to 1.5 inch group at 100 yards. I prefer the remingtons because a box of them are $8.99 and the silvertips are $10.99 I have killed deer with both brands and have seen no difference in performance asfar as killing a deer better but the core lokt does make a bigger exit whole.