Lake City vintage '73-'74-'75. My buddy gave me a bag of brass that belonged to his dad, so I thought I would Match prep it and see how 44+ year old brass will do.
I have always had great luck w/ LC,keep us posted .
If it is once fired you will need to swag primer pockets. Case capacity is less than commercial brass so work up your loads.
No pp swage should be required in my experience
I would however anneal the necks , a lot of that brass was fired in worn out a1’s and has probably age hardened some too so you’ll get a lot of split necks on firing.
It’s good brass, will last forever
Remember this is military brass and military goals are reliability, not accuracy.
That said, I shot LC brass for my NRA High Power competitions. But there were 2 things I did when I got a batch of 1 time fired brass. After I had sized all of the cases I weighed them and I rolled them for concentricity. Once you have culled the outliers then You will have a good batch. I typically shot then 3 more times in competition and then used them for practice after that.
When I sized my cases I paid careful attention to the upstroke of the press handle. If i didn't feel the button "pull" trough the neck but was completely free that was a sign to me that this case was not going to shoot well and I just threw it in the recycle box. Starting with 1X fired I would find about 2% culls but as firings progressed I found that number climbing. I remember I had 1 batch where I hit maybe 50% but then those cases had maybe 7 or more firings.
David