Just a quick question. 30BR brass

S

skeetlee

Active member
For a 330 neck what should my brass neck thickness be after turning properly? Do most turn for .0015 clearance or is .002 a better bet? If .002 was the better bet what should my neck thickness be? I am assuming some were around .0091 to .0097 ?? Just curious. I am gearing up to turn my own brass finally, so i may have more questions to come. I have relied on other folks long enough, and winter is here in central Illinois so i figure now is a good time to learn! Thanks Lee
 
I shoot a .330 neck 30br and I turn mine to .010". I shoot a Conley bullet with a pressure ring of .3083

I also just went to a .326 bushing on my die, and that seems to have been the thing my gun likes.
 
Just out of curiosity can you place a bullet back into a fired case without much resistance at a .010 neck? I cant with this one Krieger barrel. i tried some brass that measures .0092 and it seems to shoot much much better. I have a feeling my chamber isn't exactly a .330 chamber like it is supposed to be? I understand that these measurements can vary a bit during chambering depending on speed of the reamer among other things. I have a new brux barrel that jay cutright chambered and it shoots really well with a .010 neck. I dont know, just playing around a bit. Do you fellas think that a little extra room is a bad thing? I dont see how it could be as long as it isn't excessive. But there again, what do i know. I just try to listen to the rifle the best i can. Lee
 
I try to achieve exactly .002 clearance as measured on the largest portion of the neck when a bullet is seated. With a BIB 112, that means the wall thickness is about .0098.

Don't go by the wall thickness. Seat a bullet and actually measure the round, (where the gas ring is will be the biggest point). Keep in mind, measuring with a ball mic is kinda touchy, (and yes, I am a machinist), and when measuring wall thickness, any error is doubled. It is much easier to ascertain the true measurment by simply measuring the loade round.

With .002, I can slip a bullet back into a fired case, just barely......jackie
 
Let me ask fellas. Can to much clearance, say .003 cause any ill effect on accuracy, or is it just a matter of overworking the brass? Thanks Lee
 
skeetlee said:
Let me ask fellas. Can to much clearance, say .003 cause any ill effect on accuracy, or is it just a matter of overworking the brass? Thanks Lee
Click to expand...

No Problem. About half of my cases have .003 clearance and they perform just as well as those with .002 clearance.

Pete
 
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