Dave ... I wouldn't sweat the larger groups ... could very well be the ammo, I've had some rifles that love the PSP's and some that hated them. My '06 will shoot <1" with 165 gr Remmy green box. My 7-08 which likes Federal Fusion and Federal TSX loads (both right at an inch with the TSX being a little less) HATES greem box PSP's (2.5").
I doubt its the scope and more like the ammo. The low first group could be due to the loss of the pressure point (although dat is a big drop IMHO). Get some more of the Winnie loads and let us know how she does. Not reloading finding the load could be expensive (I've tried with a 300 Roy :()
