Quote:
Originally Posted by bobbyd
In my experience, brass thickness and neck tension are more critical attributes of different brands of brass than weight or capacity.
Some brands of brass (most notably Remington) are noticeably thinner than others and will grip the bullet less firmly.
I sort my brass primarily for this reason and have observed a measurable difference.
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+1^^^^^^
You should take a little time and play with a ballistics calculator and see just how much difference 75fps will affect groups @ 50yds. A list of lee cast bullets ceoficients.
38 Special, 38 S&W, 38 Colt New Police
358-105-SWC - .106
358-125-RF - .116
358-140-SWC - .142
TL358-148-WC - .072
358-148-WC - .072
358-150-1R - .131
358-150-SWC - .111
TL358-158-SWC - .117
C358-158-SWC - .117
TL358-158-2R - .207
358-158-RF- .160
That will give you an idea of the difference between case capacity/weights of the different mixed cases (volume).
Testing @ 50ft:
Bought a new 686 and wanted to work up some loads for it. I went thru all my 38spl brass and scrapped most of it & bought 2000 pieces of 1x brass. It didn't take long to find a couple of loads that would hold the x-ring @ 50ft.
Started testing plinking loads with 357 cases. Same revolver, kept getting groups like this @ 50ft.
Started over by going thru all the 357 brass and ended up throwing most of them out. Inspected by eye and tossed any that had small splits on the ends. Tossed all of them that were nickle and most of the nickle was wore off. Tossed all of them that had a ridge line forming at the bottom of the case. And then sized what was left and single staged them with an expander die and tossed any case that didn't have resistance. Wasn't much left, could of weighed those cases till the cows came home. Wouldn't of mattered. Ordered 2000 pieces of new brass from starline. Same revolver/same loads now shoots bugholes.