I've decided to see what I can do with my grandfather's Winchester model 100 in 308. Like many, we have had reliability problems with factory ammo. One loading manual said to stick to medium burn rate powders and not to go too fast or slow. I will be shooting lighter bullets, 125 and 150 mostly for varmints and targets. I gave it a good cleaning and brushed out the chamber which helped the failure to extract cases, and think a stiffer magazine spring would help failure to load the last round in the magazine. Should I crimp the bullets when using standard sizing die? I will start with standard sizing dies, and maybe go to a small base die if required. I don't have much of medium to fast burning powder on hand, I'm thinking of getting some W748, H4895 or reloader 15. The 4895 might be good for the 45-70 as well.