How often do you clean your gun barrel? Does it shoot better clean, slightly fouled, or after 10+ shots? I have a t/c that shoots best after about 3 rounds so that's how I always test it when trying new loads. 3-4 cheap factory loads then let it cool and try my stuff. Then I always clean it after a hunting trip or a range session before I put it up like I do all my guns. On the contrary. I have a cousin who has a bolt action browning 7mm rm that he swears he hasn't cleaned once for the 15 years he's had it and I swear it will shoot clovers at a hundred yards with factory ammo every time. That guns been all over the place deer and elk hunting and had hundreds of rounds through it without cleaning and shoots as good as you could want a hunting rifle to shoot. How is it even possible? Maybe I'm just too ocd with my stuff..