How does new brass fit?

If one of your rifles has an extremely tight chamber and you aren't keeping your brass for these rifles seperated, that could be your problem. Some rifle chambers are so small that the user must actually use the special "small base" resizing dies or else nothing will chamber in them...or only with difficulty.

The fastest surefire way to get to the bottom of this would be to just take both guns and some cases to a competent gunsmith.

you mean factory ammo? i was re sizing new brass never fired brass.

I second RR's suggestion. If you are using New (unfired brass) it pretty much eliminates other factors. I can pretty much rule out headspace as a problem since it occursin two different rifles. The likelyhood of two rifles bothhaving incorrect headspace is slim. I would bet money that theproblem is the brass isn't being sized properly. Your die either isn't adjusted properly or is defective. Try turning thedie in and resizing, if this doesn't solve the problem I would try a new resizing die.

How does once fired brass fit after fired in the rifle with out sizing?Good luck.

fine. i found the problem. i was backing crimper off too much to eliminate crimping and causing problems. thanks for your help as always.

Cases bulging?? Let's see a couple of pics of the bulges...