when i first got my 17/30 carbine dies i made up 100 cases. i picked 5 cases from each manufacture i had. one set was pmc and the other was ap. not sure where the ap brass is from, Philippines i think. i weighed the five case each and found they were about 2-3 gr's different. ok so they have to be kept separate. when the chamber was the wrong one i had to do the bullseye and corn meal thing.
well all went well as far as groups went, even after the barrel was rechambered the groups were nice and tight. then all of a sudden after i made and formed some more brass. i started getting fliers and pressure spikes to the point of loosening primers. i figured it was due to temperature changes as we had a front go thru.
i sat down and weighed all the cases and here is what i found. there was a 9 grain difference from top to bottom. the pmc had the lightest and the heaviest. i picked up a bag of remington 30 carbine brass. it weighed out at the weight of the lightest case of the other batch. the rp brass was all within .3 of a grain of each other.
it just goes to show ya, don't ass u me any thing and random picks can have its flaws.
here is the range results from today. sorry chronograph was at home so i didn't get velocities. hopefully no more go out one day and get 3750 from a load and the next loose a primer .4 of a grain below the previous days load.
the second group was shot with 15.1 gr of aa2015 with a 25 gr hornaday, god i love it when they shoot the cheap stuff.
the first load was 14.9 gr of N130 with a 20 gr starke. god i hate it when they shoot the no longer available.
