I sold my Winchester Coyote 22-250 years ago and recently picked up another Custom model 70 in 22-250. I ran some of my old brass through the full length sizer and tried to chamber them before reloading them. They would chamber but it took a lot of effort to close the bolt and there looks to be some obvious wear and rubbing just in front of the webbing of the brass. Brand new brass chambers much easier. The fired brass had been fired about 4-5 times and was used with a pretty hot load of H380 and 52 gr A-maxes. I had flat primers and decent cratering after a firing. Anyone know what gives? All I can figure is that this custom gun has a smaller chamber than my die will allow for. Thoughts on what to do? Thanks.