tanks Posted July 11, 2016 Share Posted July 11, 2016 (edited) Last weekend at St. George, UT I had an opportunity to chrono some loads. They were shot out of a CZ Tactical Sport (5.47" barrel) in .40 S&W. 100-104F was the average temperature. chrono was in the shade. 2,860' elevation. Loads were mixed brass, using CCI SPP and Xtreme 180gr HP bullets. OAL was 1.130" Load 1: 4.4 grains of N320 933 930 916 928 934 928 Average velocity 928.16, 167PF Load 2: 4.6 grains of N320 948 957 976 969 971 Average velocity 964.2 173.6 PF I guess 4.5 grains could be the ultimate load giving enough cushion. Edited July 12, 2016 by tanks Link to comment Share on other sites More sharing options...
rancher5 Posted July 12, 2016 Share Posted July 12, 2016 Love V320 powder but for 40 cal I use WST or WSF clean cheap easy to load ,plus I hoard my 320 for my 9mm's, thanks for your info Sent from my SM-G920V using Tapatalk Link to comment Share on other sites More sharing options...
Jay870 Posted July 12, 2016 Share Posted July 12, 2016 Thanks for posting your data. I'm currently running WSF for my TS .40 loads but have a small amount of N320 to do some test with. I'm not all unhappy with how the WSF shoots but I do get a a lot of velocity variation with it. Link to comment Share on other sites More sharing options...
tanks Posted July 12, 2016 Author Share Posted July 12, 2016 Well, standard deviation for first sample was 5.9 and second was 10.2 so I'd say not bad in terms of velocity variation. Link to comment Share on other sites More sharing options...
gransport Posted July 12, 2016 Share Posted July 12, 2016 hmm.....I'm at 4.9 grains with the same gun, same bullets but without the heavy plate (HP). Also, I'm about 900 feet above sea level and it was 79 degrees at the Ohio match when I chrono'd last. I have found a lot of these bullets coming up light, so I had a bigger margin of error. At Ohio, the bullet weighed 179.9 and I came out with a 174 PF. I'm happy with how it feels and the accuracy. Thanks for posting, I may try the HP in the future. Link to comment Share on other sites More sharing options...
36873687 Posted July 15, 2016 Share Posted July 15, 2016 What I've tested with extreme need more speed to push. Guess heavy copper plating Link to comment Share on other sites More sharing options...
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