First off, about the core locts, they're cheap, and I firmly believe that you get what you pay for with them...It's a pretty good bullet, does as well as any other soft point jacketed bullet out there I suppose, but they're awful for accuracy...most guys can get them accurate enough for 100yrd hunting, but not much farther.

All rifles will shoot differently with different types of bullets, even the same manufacturer's in different weights/loads/types are going to be hugely different...I've got a Ruger 77 with a 4-16x glass that shoots one ragged hole at 150yrds with 150grn Winchester Supreme Balistic Silvertips, while getting huntable accuracy (sub 6" groups at 150yrds) with 150grn Win. Super-X Silver tips, 150grn Power Point plus's give 3" groups usually in this rifle at 100yrds....On the same token, My M-1Garand (bluesky) shot the 150grn Balistic Silvertips into 8" groups at 100yrds and took the power points to 1.5" at 100yrds, this was without a scope.

Before you blame the rifle for being inaccurate, think about what you're doing, you readily admit that you're new to rifle shooting, it could be that you're moving on the shot, or maybe you're not used to the scope and getting a shadow, if you're using iron/open sights, you're probably doing as well as you can see, if you're shooting without a rest (bipod, bag, vise, etc) I'm not honestly surprised you get poor results...100yrds is a lot farther than people give it credit, jump up and go sprint it sometime, or try throwing a baseball half that far (no accuracy, just range), shooting to 100yrds can become easy if you do your part, but just jumping into a race car doesn't make you ready for the Indy 500. I'm going to say it, I'm betting it's you, not the rifle (although the 2" group would have been doing well for a factory rifle).

What you're experiencing is fairly normal in theory, you've got some pretty extreme variations in zero between the two Winchester loads which surprise me, but the difference in precision of the Corelokts and Wins don't surprise me at all...one thing I'm curious about, with the 165grn Super-X's, was the group small but a foot off, or was it a 12" group on center? The difference in group size doesn't surprise me a bit, however, if your central point of impact (the center of your groups) changes 12" between the two loads, you've got a weird rifle.



I don't know the condition of your 70, nor if it's a "fluke" crapper that makes it out of the factory, nor what scope you're using (if you've got one), nor what mounts you're using... all of these things and about half a million others effect your accuracy, shooting factory ammo, especially cheap factory ammo is basically what it is...shooting crap is a crap shoot, so to speak, don't expect premium grade accuracy from bargain bin ammo.