I find on the 243 cal. the shoulder has to be pushed back .003 to lock up
I tried a neck size die only still needs a full length resizing die.
I think the chambers are a tad to long and find on my 243 cal. to keep the brass at 2.045 I find also the coal at 2.700 for 95 grain to 100 grain bullets
The sierra I seat them at 2.655:I did a lot of playing with the 243 cal. it is a funky cal. I shoot my brass on reloads as mush as 15 times and as soon as I see the small ring mark after the round is fired I toss it.
I seem to find on the top end brass seem to get shorter in life maybe 10 reloads and that is maybe.I load on the lower end of the chart and seem to get it together