Originally Posted by elkaholic
Hi guys.....I got a bit of a surprise today when I measured the factory .280 A.I. brass. It only measured 2.521". I know when you fireform regular .280 brass that is about what you end up with but I thought the new stuff was supposed to measure around 2.540 like the .280 Rem. This doesn't make a whole lot of sense to me as the chamber spec is 2.560" Somebody help me out here. thanks.........Rich
I think the chamber spec for the 280 is 2.540 and the chamber spec for the AI is 2.525 to
the neck to shoulder junction.
I haven't seen the 2.560 chamber.
Normally when fire forming the 280 to the 280 AI the neck shorten,s a few thousandths from
blowing the shoulder out So factory ammo is .010 to .015 shorter in the neck.
The chamber should be set up to shoot factory 280 loads and head space with the 280 gauge.
Factory ammo is always under sized to fit any chamber within reason and the AI dies are not
small based dies and so if you compair the fire formed brass aganst the SAAME spects, that will
tell you if the chamber is SAMME spect.
J E CUSTOM