Thread: Fire forming 270 to 280ai

Originally Posted by Trav-6mmrem

No issue, the 280ai dies work fine. The info on line says the Sammi specs are 14 thou shorter shoulder compared to original ackley specs, this is coming from the redding website. My kimber being a new factory rifle will have the Sammi specs

OK ta. Iv been down this rabbit hole for 15 years or so and keep my ear to the ground for someone that might have some actual physical evidence of the mystical 14 thou difference. After gauging quite a few chambers and measuring brass I'm yet to find any at all
If your interested there's some good reading here. https://gunsmithtalk.wordpress.com/2...mproved-alert/ These guys were early to the party with the warning regarding the difference. They copped some flak so built both the traditional and the SAAMI chambers to show the difference but actually found there was no difference at all. https://gunsmithtalk.wordpress.com/2...eadspace-test/