Bushing Style Neck/Full Sizing Dies...
I want to know if I understand how these work correctly. For the parameters of this discussion, let's assume we are using Lapua Brass which is high quality and VERY consistent.
It's my understanding that the best way to use these dies is to load a few rounds and measure the neck of the loaded ammo, then take the smallest measured case and subtract .001 from it to determine the bushing size you need to order. This bushing should work for that entire batch of brass (again, assuming you are using VERY consistent brass).
My question is this...will that bushing only work for the first firing of the cases in that batch of brass??? The reason I ask this is b/c I'm wondering...Won't the thickness of the case necks vary after each/repetitive firings?...and if so, won't that affect the size of the bushing you need?
If my assumptions above are correct, wouldn't you need to have one size bushing for your first firing of your cases and separate bushings for each subsequent firing.?.?
What I'm trying to figure out here is if it's worth getting the neck sizing bushing die...or to stick with the regular deluxe die sets...
Thank you for any feedback you can give me![8D]
It's my understanding that the best way to use these dies is to load a few rounds and measure the neck of the loaded ammo, then take the smallest measured case and subtract .001 from it to determine the bushing size you need to order. This bushing should work for that entire batch of brass (again, assuming you are using VERY consistent brass).
My question is this...will that bushing only work for the first firing of the cases in that batch of brass??? The reason I ask this is b/c I'm wondering...Won't the thickness of the case necks vary after each/repetitive firings?...and if so, won't that affect the size of the bushing you need?
If my assumptions above are correct, wouldn't you need to have one size bushing for your first firing of your cases and separate bushings for each subsequent firing.?.?
What I'm trying to figure out here is if it's worth getting the neck sizing bushing die...or to stick with the regular deluxe die sets...
Thank you for any feedback you can give me![8D]
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the thickness of the brass dosn't change much, even after several firings (you'd probably wear the brass out first). If you are going to that level of accuracy you'd be 'turning' your necks first anyway (yes, even lapua brass). 0 -
Measure the neck thickness of the brass and double the number. Add the diameter of the bullet. This will be the diameter of the neck of the loaded round. Use a bushing that is .002 to .003 smaller than this number. By neck turning, all of the cases will be exactly the same. While Lapua is the most consistent, it varies .001 to .002. With neck sizing only and moderate loads, the necks do not get thicker. Reloaders frequently get 40 to 60 loadings per case or more. 0 -
Brass will flow after a few firings and the necks will tighten up and need turned a little if it's a tight necked chamber. Usually it will only need done that second time and it will quit gaining length.. The bushing dies these days are only .001 under loaded measurements for the best use, a while ago it was standard practice to go 2-3 thousandths under loaded measurements but that has changed for the best...
I prefer a custom full length sizing die these days, that way ever thing is always the same.
No need to go back later and tweak anything thats not 100% dead on specs.......0 -
quote:Originally posted by MIKE WISKEY
the thickness of the brass dosn't change much, even after several firings (you'd probably wear the brass out first). If you are going to that level of accuracy you'd be 'turning' your necks first anyway (yes, even lapua brass).
Believe it or not, Redding doesn't recommend turning your necks. I know a LOT of folks do it, but Redding doesn't actually recommend it.0
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