My Ruger 77 mk II .223 will shoot the cheapwinchester varmint factory loads (45gr hollow point, 3600 fps, 40 rounds per box) into a group less than 1/2" at 100 yards. I want to duplicate these loads with my handloads and I was wondering if they use the Win 748 powder for these factoryloads? Does Winchester only use their own powder in their factory loads?

Thanks
Tom

I had a similar question and called Winchester. They said they don't give out load data for their factory ammo. They just said look at their free reloading data and that might give me an idea.

Ok thanks I will check out their free load data.