Thread: My 260AI Load Development Begins

Originally Posted by Tikka7mm08

I find on some brass once fired that there is a minor tightness to chambering, say 2 out of 10. I have body taper die and that doesn't work but a feeler gauge under the case seems to work well to make it like new brass again. Is this the shoulders requiring a bump back? I will drop the load back as it must be slightly hot, and perhaps take some before and after case head dimensions...what is the consensus on allowable case head expansion?

I found the same with my 30deg Imp. Bump die with feeler gauge sorted the issue & I backed it off 0.5gr. All the cases seem to be ok now and primer pockets tight. I did stuff 7 cases by running 1gr over where I'm at now, the primer pockets were loose as. Trying too hard as a velocity hound