I have been reloading for my Remington MDL 7 in .300 SAUM. I have reloaded thousands of handgun bullets, but rifle loading in pretty new to me.
The problem I'm having is that about half of the cases I have loaded do not chamber in my rifle well. The case will chamber easily until the bolt almost closes. Then approximately half the cases make the bolt very difficult to close. I'm having a difficult time trying to explain this, so bear with me. I was able to close the bolt on all 20 rounds except one. About half chambered easily. The other 10 rounds chambered easy until I was locking the bolt handle in the down position. None of the fired cases showed any signs of high pressure or looked any different than the others. My groups were all between 1.62" for three shots at 100 yards, down to .455" for three shots. My last five shots grouped in x ring in .859".
When I got home I measured the cases that were hard to chamber and they all measured exactly the same. I then checked the 20 cases that I had prepped already except for powder and seating the bullet. I chambered all 20 cases and 8 out of the 20 were hard to close the bolt on. All the cases were reloads from being fired in my rifle and I could see no difference in them at all, even after measuring them each with my digital calipers. The only thing I can think of is that the shoulder is not the same on all the cases. I full length resized the cases and trimmed all to within .003". I am stumped. Any suggestions or possible reasons? BTW, I am pretty proud of that 5 shot group. Its the best I've ever shot by far. John