I just purchased an all weather Ruger M77 MarkII in 7mm Rem Mag. The gun currently groups 1.5" at 100 yds with 140 gr. Nosler Ballistic tips. I am intersted in swapping the stock for a drop in mcmillan that is from cabelas ($359). Does anyone have any experience with this stock or can you recommend a good drop in alternate? Should i expect improved accuracy if I change the stock?