Case Comparison - 09/21/10
The Lapua thread got me thinking about different cases and their consistency, so I figured I would measure/weigh some and see what differences I got between the two batches of new brass I had at home. I had a new bag of Winchester 243 Win brass and a new bag of RP .25-06 Rem brass. I weighed the cases to see how close their weights were, then checked all the cases for neck thickness variance. Before any comments, I had time at work and this seemed more enjoyable then reading on the internet.
Winchester brass- weight between 156g-162g. 2% 157g, 6% 158g, 15% 159g, 40% 160g, 26% 161g, 2% 162g. The neck thickness varied by 0.001 inches in 43 of the 47 cases. 4 cases had 0.002 inches of variance.
RP brass- weight between 191-195g. 4% 191g, 37% 192g, 31% 193g, 22% 194g, and 6% 195g. The neck thickness varied more with 15 of the cases having 0.001 inches difference, 26 cases having 0.002 inches of difference, and 10 having 0.003 inches of difference.
Again, a bunch of number that I doubt will make any difference on the target. I have read that greater than 0.003 inches of neck thickness variance is too much, so I guess I dont need to cull any cases. Both cases have the bell shaped curve for weight as well.
Sorry to waste your time, but hopefully someone will find this interesting.
Any thought?
Which set of cases would you consider better? The Winchester with the lesser neck thickness variance or the RP with less weight difference?
Winchester brass- weight between 156g-162g. 2% 157g, 6% 158g, 15% 159g, 40% 160g, 26% 161g, 2% 162g. The neck thickness varied by 0.001 inches in 43 of the 47 cases. 4 cases had 0.002 inches of variance.
RP brass- weight between 191-195g. 4% 191g, 37% 192g, 31% 193g, 22% 194g, and 6% 195g. The neck thickness varied more with 15 of the cases having 0.001 inches difference, 26 cases having 0.002 inches of difference, and 10 having 0.003 inches of difference.
Again, a bunch of number that I doubt will make any difference on the target. I have read that greater than 0.003 inches of neck thickness variance is too much, so I guess I dont need to cull any cases. Both cases have the bell shaped curve for weight as well.
Sorry to waste your time, but hopefully someone will find this interesting.
Any thought?
Which set of cases would you consider better? The Winchester with the lesser neck thickness variance or the RP with less weight difference?