halfmoanut
Silver $$ Contributor
Necks need to be turned to ???? Per side. What is the formula. .262 neck chamber, bullets .2435 pressure ring. Using .256 .257 bushing . What do the necks get turned to?
The formula is chamber diameter minus the clearance you wish to start at. So lets say you start at .003" clearance. Subtract .003" from .262" and you get .259". Then subtract the bullet diameter .2435" from .259"=.0155" or 16 thousandths divided by two is a neck turn thickness of .008" for a loaded diameter of .259" and a sizing die bushing of .257". I always do just enough clearance to fireform and after fireforming twice I make a final cut of .001-.002". It seems fireform sometimes will make brass flow more to one side of the neck or the other and the final cut cleans up this runout. The amount of final neck clearance will be determined by how much bullet grip I have after firing. If you can seat a bullet in a case without sizing after firing, you don't have enough clearance in my opinion. Brass springback will determine this and every lot or brand will be different. I have however seen many competition loads that never get sized!
It's can not can't. Brass springback figures into the equation but if you still have enough grip where you can seat a bullet without sizing the neck then you don't have enough clearance to release the bullet cleanly. And if you can't seat a bullet in the fired case, you really have a problem!!Excuse me if I am missing your point but did you mean "If you CAN'T seat a bullet in a case without sizing......."
It's can not can't. Brass springback figures into the equation but if you still have enough grip where you can seat a bullet without sizing the neck then you don't have enough clearance to release the bullet cleanly. And if you can't seat a bullet in the fired case, you really have a problem!!
I'm confused. Doesn't that make .003" clearance only opposite the side of the case neck that's touching the chamber neck?The formula is chamber diameter minus the clearance you wish to start at. So lets say you start at .003" clearance. Subtract .003" from .262" and you get .259".
If you say so. That's different than I was taught and remember. Maybe I just learned something. Thanks.That's exactly what I'm saying, a clearance of .003" is .0015 on each side of the neck!!
It's only as complicated as you would like to make it, LOL! But it is simple math'th'th!!! I r not a math major,If you say so. That's different than I was taught and remember.
+1... that is how I know it, as do must everyone I converse with.... a clearance of .003" is .0015 on each side of the neck!!