Originally Posted by
versifier
Hi bigo,
It's interesting that you would be asking about .338's. There's a guy at my club shoots one for pleasure, about ten rounds at a time, always Rem factory stuff. I have some of the brass sitting in my extras box and was just looking at it yesterday.
Belted magnums are kind of a world unto themselves as far as reloading them goes. If you are thinking about light target loads or cast bullets, if you necksized your brass, you might get twenty or more reloads from a lot of cases. BUT, and it is a big one, in the real world, they can be a royal PITA to load for. Some are not, though, and they can behave just like regular rifles if you get a lucky one.
For serious hunting/dangerous game loads, they need to be Full Length sized (because any feeding problems can possibly be fatal). Fl sizing, depending on how tight the chamber dimensions are and how closely those dimensions match those of your sizing die can work harden the brass very quickly, requiring anealing often (sometimes every other firing) and limiting brass life significantly. The high pressures tend to make the brass flow more that it would in a smaller chamber/lighter pressure situation, and that means they might require more frequent trimming. This tends to thin the brass of the case body just above the case web and leaves the area weakened, increasing likelihood of a head separation. Again, an unacceptable situation in a dangerous game rifle.
So, if you are going to hunt something that will hunt you, make up handloads with brand new brass and premium bullets. If you are part of the 99.99% of the rest of us who won't and don't, look at it as you would any rifle new to you: a puzzle to work out. Only by actually doing it can you find how your rifle is going to behave and what kind of brass life you are going to get. Some magnum shooters are lucky to get two or three loadings from a case with hot loads. In big magnums, milder loads always put less stress on brass (and on shooters) and ought to give you better case life, especially if you can get away with neck sizing. Some rifles require FL sizing for good feeding, and some even require Small Base sizing (and I don't even want to speculate on how much a custom SB die would cost). A lot of magnum owners really enjoy shooting light cast loads for much less wear and tear on both barrel and shooter.
And yes, it sounds like your uncle used a Lee loader (a neck sizing only tool) on the rounds he gave you. Neck sized brass is always only to be used in the same rifle. It was probably an older one with a fatter, worn chamber.