FLIGHT762 - I'm measuring with a dial caliper and Hornady headspace gauge/comparator (base to datum line). Could be the case web but I'm not seeing it when I measure with the dial caliper, may have to get the dial micrometer out. I have considered a small base die but I'm not convinced yet.
DAVETOOLEY - 5 Gallon bucket containing once fired brass from my 700 LTR and AI MK-III. This is the first time sizing brass out of the AI in FL Die that was set up on brass from the 700 LTR. Unfortunately, I have no way of differentiating the 700 LTR brass from the AI brass. Ten cases pulled from the bucket and sized in a FL Die will have identical headspace measurement (after sizing, not before). Out of the ten, one or two will not chamber in the 700 LTR, all will chamber in AI.
LASH - Haven't checked neck diameter after loading yet. Bolt won't close without significant pressure on the bolt handle. It starts to but is very stiff. If forced all the way into battery everything will be locked up.
SHOOT4FUN - 2/3 of the brass in the above mentioned 5 Gallon bucket was fired from the 700 LTR, 1/3 fired from the AI MK-III. The brass in question is not chambering in the 700 LTR but will chamber without issue in the AI. So yes, I believe you are on the right track.
The question remains, without being able to retroactively sort the brass (700 LTR from AI) what is the best reloading procedure to size ALL of the brass in the bucket so that it will chamber in both the 700 LTR and the AI??? Keep in mind, the headspace dimensions of brass from both rifles is identical after sizing, so I can't believe I'm fighting a headspace issue although it is certainly symptomatic of a headspace problem. Thoughts??? And yes, BTW, I WON"T be mixing brass anymore!!!
Talk about a story problem!!!!