Originally Posted by Iron Worker
AtownBcat Why neck size only? Life of brass? I've been hand loading for 30+ years unless you have a custom chamber and even then there is no hard evidence that once fired neck sized brass will be more accurate...... For some one to blow up their gun with hand loads they have to just about try to do that.Why? There are many warning signs before your rifle becomes a bomb. Or just be the dumbest idiot in the world. like loading a case full of pistol powder.
Neck sizing works fine for ANY chamber, factory or otherwise. Some of the benefits of neck sizing only are:
1) Less working of the brass (longer brass life, both in the neck and also ahead of the belt for belted cartridges).
2) By only sizing 3/4 of the neck, you will get a bit more 'centered' fit in your chamber.
3) You don't have to clean the lube off the case (because you don't have to lube the body of the case). In fact, if you are using the Lee Collet die, you don't have to use lube AT ALL.
There are also a couple drawbacks from neck sizing only. Mainly, you can build great ammo that will not work in other rifles. And secondly, if the rifle is used for hunting, you might have trouble closing the bolt on a very cold rifle, because it will typically shrink a little and be colder than the ammo (especially if you have carried it in your pocket
Many folks have reported great groups with a crush fit, however I've never had that experience with my hunting rifles (heavy calibers). I've always had the best experience with about .001" of headspace (shoulder push back) and 3/4 of the neck resized (using bushing dies that gave around .001" of neck tension).