Hopefully this is the right forum for this thread. I couldn't find any prior threads that could answer my question. I'll try to be short and clear. I have just been neck sizing my brass with a Lee die since I only use it in this rifle, so everything is fire formed.
I was measuring my rifle for OAL and made a dummy round. After I would seat the bullet .020 from my OAL measurement, I noticed the round did not easily slide out, so I thought the bullet was in the rifling and I measured incorrectly. However, it was the fire formed cases catching in the chamber. I double checked with a FL size dummy round to verify and the round falls out easily. Of course, I would expect fire form cases to catch since they are shaped by the chamber.
I measured the OAL with ogive just touching the lands at 3.29 (this is base to tip but I will actually measure and seat based on base to ogive). So, I want to start at 3.27. I have seated at 3.24 in the past and I saw flat primers meaning increased pressure and I was not even at max loads. My question is, can a fire formed case require a shorter OAL than a FL sized care to not have incorrect pressure? I should be able to seat out to 3.27 no problem but if I am seeing pressure increases at 3.24 with a fire formed case, then 3.23 seems to be the limit. I thought about loading a few FL sized cases to 3.26 as check them for pressure signs. Any thoughts or ideas in regards to this issue? Thanks.