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Discussion
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Over the weekend I took refuge from winter in the reloading room and did some case capacity measurements. I thought some of you might find this interesting. I measured 5 of each case using water with a drop of dish soap in it to break up the surface tension. Capacity was measured in grains of water held.
45ACP cases:
PMC: 25.2 grain average; SD = .2; ES = .5
Winchester: 25.4 grain average; SD = .2; ES = .4
Starline: 25.6 grain average; SD = .5; ES = 1.4
308 Winchester cases:
Hornady: 55.2 grain average; SD = .2; ES = .7
Starline: 54.1 grain average; SD = .3; ES = .8
Federal: 53.8 grain average; SD = .2; ES = .7
Lake City: 53.8 grain average; SD = .2; ES = .6
Peterson: 54.3 grain average; SD = .5; ES = 1.3
None of the results surprised me. I’m not sure anything I found here will change what I do. If I do any follow up testing, it might be to pick 5-10 more Peterson 308 cases to see if the increased amount of variability holds up or if it was an anomaly.
