I had a 22x250 1x8 twist done up a few years ago and never shot it. Simison built finished 29" lilja in a McMillan Hunter class stock. I want to work up a load for this but need some help on the loads. Early fall I like to use it for Pdogs at 500 plus shooting. Don't know if I should cull winchester brass or go for the Norma?? Bullet selection there's a few choices Berger 73 gr Match BT or the 77 gr Match BT. Hornady has the A Max 75gr and the 80gr. It's the starting load and powder selection that I am after. Seems there's not allot of info on data once you move past the 60 grainers.