Looking for advice and opinions if this is worth doing. I have 500+ brass that is a mix of 5.56 and .223 of about 5 or 6 different manufacturers. Lake City, PMC, Squires and Bingham 5.56, and Winchester and Remington Peters 223. All the brass is going to be on it's third loading, so I don't intend to load it again after this. Some dates back to 1978 left over from my old AR180 shooting.
I also have sitting in my cabinet 600 small rifle primers, 5 pounds of Reloader 15, and 600 Hornady 75 gr BTHP's. A really good bullet. I am trying to decide how to mate up all this various brass with the Hornady's in a logical manner.
Option 1, I would measure the internal case volume of each brass type, and use a software program like Quickload to extrapolate the chamber pressures and performance of each case type with that bullet. Then in a quest for consistency, adjust the powder in each case type so that all types are as close as possible as far as chamber pressure. My goal would be to try to get the same performance as closely as possible from rounds loaded with different brands of brass.
Option 2 Would be to just load a mild to moderate powder charge that would work in all brass with that bullet, but would have significant variables as far as chamber pressure,(although still safe) but probably very variable as to relative accuracy. And just consider it plinking and mag dump ammo. Would kinda be a waste of a really good bullet.
Either option, cases will be crimped
Primary rifle for use is a Colt Pre Ban Match HBAR, 1 in 7 twist. I am considering switching from a red dot on that one to a decent mid range scope. Option 1 would give me ammo I could probably upload safely to use at further distances. If I did Option 2 I would also use the ammo it in my Olympic Arms carbine with a 1 in 9 twist. Otherwise probably not.
I just don't know if Option 1 would be worth all the work, and if the accuracy would justify it, What do you guys think?