I swapped the barrel from a stock 22-250 to a 243 Win. Went with the a new Shillen 26" varmint. According to the "Go" and "No Go" gauges spacing is right. Then I tried to chamber several pcs of brass and none would chamber. Always stick and some would not allow the bolt to go down. These were all full sized and primed. I checked them and they are within tolerance. Any ideas?