by Seismic Sam on Fri Jun 10, 2011 10:48 am
Sorting by lot is impossible unless you buy it fresh from John-Boy and can see the lot number on the case of new brass. I personally think sorting by headstamp is valuable, as the last time I loaded up some 9mm blasting brass with the leftover junk headstamps that I don't want, I ran into absolutely tremendous case mouth thickness variations, going all the way from almost to tight to seat the bullet to so loosey goosey the bullet almost slid into the case by itself. I was not happy with the way that loading session went, and I made sure that I crimped the snot out of the bullet to make sure a bullet didn't back into the case and cause a kaboom.
I only keep Winchester, Federal, R-P, and PMC headstamps in 9mm. In 45 I keep Winchester, R-P, Federal, and WCC (Western Cartridge corporation (Military 45 ammo)). There are two reasons I keep these: First, these are well known AMERICAN companies that have been around forever (except for PMC) and secondly, the majority of the brass you will find will be one of these popular headstamps so you can load up a full box of one headstamp.
As far as having to redo your loads for different headstamps, unless you're loading right up to the max with a +P load, it's NOT a problem and don't worry about it. If you are loading up to the max, then you MUST have a chrono so you can see where your velocities are going. You won't bee there for quite a while.
For rifle cases, there are not as many lying around, so the chances of getting a full box of 50 of one headstamp are practically nil, unless you come to OGC right after the local SWAT team has just shot up a couple of thousand rounds of .223 right before you got there. (Very rare occurrence.) You're FAR better of to just buy a few hundred new cases from John-Boy and leave it at that. The inside of new cases have to be chamfered, but that's all you really need to do. As far as runout and neck turning, that is advanced stuff that you won't be getting to for some time unless you get into benchrest competition. Some of this is also a function of the rifle, and I have a Colt 1975 AR-15 that shoots okay, but it's a Vietnam era gun and back then AR-15's were NOT designed to be super accurate. I have an Armalite AR-10 flat-top that JP worked over for me, and I expect a LOT more out of that gun. Only shoot one lot of brass that I bought new, but I don't bother with neck turning or runout because it is still a semi-auto.
The only gun I go the whole 9 yards with is my Remington 700 Sendero SF in .338 Ultramag that's a full JP custom job, and that thing, if handled properly, can make hits on targets at 1200 yards or more.
Hope that answers your questions.