Originally Posted by MagnumManiac
No, that's the maximum length!
This measurement is what the brass normally shrinks down to upon fireforming, so it became the standard. My chamber is at 1.912", the original 22-250 length, it supposedly gives me a longer neck, but I haven't reached that length yet! I haven't even reached the trim to length of 1.902" so far!
There a reason you haven't reach 1.902". Your blowing the case body wider and moving the shoulder forward as most Ackley cases do. Your just reforming the case to a different dimension and that comes from case length vs stretch the brass. My 22-250AI brass length is 1.890". I think Nolser has a diagram maybe Sierra does also on the 22-250AI case that they have loading data for.
My 22-250AI dia at the start of the shoulder mikes .454" vs .413" on a new Win 22-250 case and the case neck length for the AI is .250" vs .248" for 22-250.
You might want to get a reamer print from your gunsmith to confirm that case length. My gunsmith gave me a factory 22-250 case fired in the AI chamber as he has with some of the other AI rifles he chamber for me.