I'll start the ball rolling with something that has been bothering me about my Mini 14. When I switch ammo brands I get alot of horizontal stringing. Meaning my rifle is dialed in with my reloads at 100 yards.(winchester748 55gr soft points) If I shoot UMC 55gr ball it shoots about 6 inches right of the target. If I shoot winchester USA brand (55gr) it shoots more than 12 inches. I have shot some miltary surplus ball ammo made in Malayisa that shoots more than foot to the right. Each ammo shoots fair to good groups, just to a different point of aim. I have a friend with a Mini 14 and he gets the same results. I could understand vertical strings if one ammo was hotter, but not the horizontal. I also suspect this is why some people think the Mini 14 has bad accuracy. If I switch ammo without changing the point of aim of my scope, sometimes I can't even hit the paper.