How many rounds are through the rifle so far? Do you reload? Well, there's a lot of questions that play into the accuracy of a rifle. Fire lapping is permanent and irreversable if done wrong. Have you made sure the action screws are equally tight, bbl floated, action bedded, different recipes tried on the loading bench?
A half-inch group aint bad. A lot of what is done is done as an answer to a problem, not a problem looking for a question.
Rednecks... Keeping the woods critter-free since March 2, 1836. (TX Independence Day)
I'm going to use the words "clip" and "Long Colt" every chance I get. It grinds my gears to see new members attacked when we all know dang good and well what's being refered to.