SA Friday
03-18-2013, 16:33
OK. my AICS is chambered in 308 Win match. It's 308 Win, but way tighter. New brass resized and reloaded cycle through it fine. Brass once shot out of my Rem 700 PSS and FULLY RESIZED with an RCBS X-die will lock the chamber up. I can just barely get them to chamber, and after firing, forget ejection without a plastic handled screwdriver and a full length cleaning rod.
Let me be really clear on two things here; the brass is fully resized. I literally cannot get the resizing die screwed down any further. Second, the hard ejection is NOT due to overpressure. These exact same loads have been shot out of new brass in this gun and no overpressure issues. These cases have all the earmarks of a 40 S&W "guppied brass" chamber jam. The belly of the cases are 'shiny' just like they got forced into the chamber before shooting (and they did get forced into the chamber just a tad). This is even an issue with cases shot out of the gun previously, but not as bad. I tried the fully resized (once shot) rounds in my PSS factory chamber and they chamber and eject like they were on oiled bearings. The only two places I can see oversizing cause this FTE is the very back of the neck right next to the shoulder or the back of the case wall near the webbing.
I think the die I'm using isn't getting the brass resized back to factory specs enough and this is causing the jams, but I want to know if anyone else out there has ran into this before. I literally just got back from the range so I haven't taken any measurements off the shot cases and loaded cases but plan on it. I'll post the info later.
Second Question; anyone have any suggestions as to a tighter resizing die? I'm thinking one of the 308 Win carbide Dillon dies might be tighter, but want input before I splurge on the "cry once" die.
Let me be really clear on two things here; the brass is fully resized. I literally cannot get the resizing die screwed down any further. Second, the hard ejection is NOT due to overpressure. These exact same loads have been shot out of new brass in this gun and no overpressure issues. These cases have all the earmarks of a 40 S&W "guppied brass" chamber jam. The belly of the cases are 'shiny' just like they got forced into the chamber before shooting (and they did get forced into the chamber just a tad). This is even an issue with cases shot out of the gun previously, but not as bad. I tried the fully resized (once shot) rounds in my PSS factory chamber and they chamber and eject like they were on oiled bearings. The only two places I can see oversizing cause this FTE is the very back of the neck right next to the shoulder or the back of the case wall near the webbing.
I think the die I'm using isn't getting the brass resized back to factory specs enough and this is causing the jams, but I want to know if anyone else out there has ran into this before. I literally just got back from the range so I haven't taken any measurements off the shot cases and loaded cases but plan on it. I'll post the info later.
Second Question; anyone have any suggestions as to a tighter resizing die? I'm thinking one of the 308 Win carbide Dillon dies might be tighter, but want input before I splurge on the "cry once" die.