People need to shoot more and give advice less. If a 300WM went from "lights out" to 2 inch groups, it isn't due to fouling. If it is- get a new barrel. We shoot tons of 300WM, 300NM, and 338L and at 200 rounds some have opened up from sub MOA 10 round groups, to 1-1.2moa for ten. Most will go 250-400 rounds before getting a wipe down.
Have a 300 win mag (krieger, manners,surgeon zeiss v8 glass) Broke in barrel properly. Immediately developed load gun shot lights out, After about 200 rounds 2 inch groups now. Very disappointed and looking for any intelligent suggestions. Thanks for any input!
You need to start in this order or you are wasting time-
Action screws degreased and torqued.
Scope base, screws and action degreased and torqued.
Change scopes.
Scopes fail a lot. Even the one you have.
