Brass Shrink???

[rwj]

i would love for lyman to make a borescope long enough to be able to see the interface between a piece of fired and unsized and sized brass and the chamber

pics of.that would be interesting.

Until they do, you could drill a clearance hole in the base of a case for the rod to pass thru...

 

[David247]

Well, I just took a look at my notes and your right. My Savage 12FV throat is 1.942 and my Savage Long Range Precision LRP is 1.944 to end of throat. The Hornady book suggest trimming to 1.920 or that's the number on diagram anyway. So I have .022 roughly to deal with. I'd now change my suggestion to what you mentioned at .010 or .005 if your watching it all the time. Don't want to pinch a bullet that's for sure. Thanks for catching that. HB

That's what I am concerned about, pinching a bullet. I am wondering if something like this would be best dealt with by getting rid of all of the old brass and starting over but it is $300.00 worth. then I thought, well what if I just trimmed it all to match and used it? I got 300 pieces and should get ten firings out of it and it is roughly a 3000 round barrel. So if it does form a carbon ring, what difference would it make as long as I never get new, full length brass for it. Any thoughts?

 

[Richard Coody]

That's what I am concerned about, pinching a bullet. I am wondering if something like this would be best dealt with by getting rid of all of the old brass and starting over but it is $300.00 worth. then I thought, well what if I just trimmed it all to match and used it? I got 300 pieces and should get ten firings out of it and it is roughly a 3000 round barrel. So if it does form a carbon ring, what difference would it make as long as I never get new, full length brass for it. Any thoughts?

i like a batch of brass all the same neck length. that said i also like my necks long.

i did the same thing in my early days of reloading. thought i was doing the right thing trimming that brass very carefully to trim length. then when i measured my fired brass the were short and not consistent. scratched my head on that one a while but finally figured it out.

i wouldn't throw that brass out. i would load it and shoot it and watch it grow. if you can get 25 or so pieces with consistent neck lengths those are the ones i would use for load development.

i think the chances of.pinching a bullet are much exaggerated. you should be able to feel it anyway on chambering the round.

 

[hambone1971]

That's what I am concerned about, pinching a bullet. I am wondering if something like this would be best dealt with by getting rid of all of the old brass and starting over but it is $300.00 worth. then I thought, well what if I just trimmed it all to match and used it? I got 300 pieces and should get ten firings out of it and it is roughly a 3000 round barrel. So if it does form a carbon ring, what difference would it make as long as I never get new, full length brass for it. Any thoughts?

Don't get rid of it, shoot it and it will grow back out. Trim it .010 short of real neck depth, and as one local trapper said "Be Happy and Chive On". Nothing wrong with your brass, seems to me.