Originally Posted by metal2meat
Ok gents, time to resurrect this one for some more discussion. I'm one of the thoroughly puzzled 280ai newbie owners. I bought a 280ai two years ago, used. The guy I bought it from provided the reamer specs and I believe this to be a Saami spec reamer. I've been loading with Nosler brass. I usually neck size but after my third loading, cases were tight in the chamber and the bolt was tight.
I set up a redding 280 imp 40* body die per the instructions (to the shell holder), lubed a case a ran it through. It was extremely tight on the case body. I pulled the case and tried it in the action- bolt didn't come close to closing!
I turned the die a quarter turn down and did it again, still would fit in the chamber! I inked the shoulder and neck with a sharpie and went back to the press. Turned the die another quarter turn down. This time the press was camming over hard. There was no mark on the blackened shoulder. Tried the brass in the chamber- no fit!
I sacrificed a shell holder and sanded a few thousands off it (about .008). This allowed me to still turn the die down and not cam so much. Relubed, resized again and got just the slightest ring in the sharpie mark on the brass at the just below the shoulder neck junction. Tried this in the chamber and it was extremely tight but the bolt closed. A little more sharpie removed from the brass after this.
Took a few more thousands off the shell holder, turned die another 1/8 turn down and repeated another run through the die. This time the die showed good contact with the sharpie coating the shoulder. Put the brass in the chamber and the bolt closed as if it were new brass!
Earlier in this post I read per Dave Manson "Finally, re-loading. Don't use dies made to the old spec to re-size cases fired in SAAMI-spec chambers. The few re-size dies I checked that were made to the "old" spec would not reach the shoulder of a case fired in the SAAMI chamber."
Is it possible I have redding dies made to old spec? I tried a redding type s full length sizer with the same results as the body die that came out of a competition set. Is there a way to know?
An additional note. In my .223AI, new parent case .223 Rem brass has a "crush fit" which I was told is by design to ensure a snug fit of the brass for fireforming. With my 280ai, no crush or snugness of factory new 280Rem brass.
Any ideas about what the heck I have going on? Thanks!! Whew!
Nosler and Sierra manual had the same case measurement for the 280AI and case length was 2.525" same as what SAAMI spec is
Nosler changed their manual 2007 to conform to SAMMI spec for the 280AI which was approved 2008.
I'm sure sometime maybe 2006 they were working Nolser manual since it came out 2007 and those reamers for the 280AI SAAMI spec were in place. It was 2008 that you could buy Nolser 280AI brass and I got some back then.
My wifes 280AI was complete June 2006 and it chambers Nosler 280AI brass and my 280AI build couple years ago chamber 280AI brass fine and I use same Reddin280AI body die and Wislon neck and seater die.
.What you might do is call Redding tell them about reamer print you have they may be able to help you out.