Drmike Posted December 6, 2020 Share Posted December 6, 2020 Hi, does anyone have any specific data on the change in velocity per tenth of a grain of VV N320 in their 50 loads? I have lost my ladder load info. Last year I had to increase my 180grain load (1.18” oal) from 5.4 to 5.6gr to make chrono. Just did a batch with a new container of powder and they are 80-100fps over what I need. Likely need to drop back to 5.4 Link to comment Share on other sites More sharing options...
noylj Posted December 9, 2020 Share Posted December 9, 2020 Even if they did, it would only give you an approximate idea of what you would get in your gun. Sounds like you already know what to do—just don't lose your data again. Link to comment Share on other sites More sharing options...
Mike21STI Posted December 9, 2020 Share Posted December 9, 2020 You'll see anywhere from 5grains to 5.5 grains to make major depending on your barrel. Link to comment Share on other sites More sharing options...
Silver_Surfer Posted December 10, 2020 Share Posted December 10, 2020 Sooner or later you will have to re-chrono. Why not load some at 5.4 & 5.5 and chrono just to make sure? Link to comment Share on other sites More sharing options...
Drmike Posted December 28, 2020 Author Share Posted December 28, 2020 On 12/10/2020 at 7:54 AM, Silver_Surfer said: Sooner or later you will have to re-chrono. Why not load some at 5.4 & 5.5 and chrono just to make sure? New powder makes it at 5.4gr. 178PF Link to comment Share on other sites More sharing options...
Bigzeke Posted January 4, 2021 Share Posted January 4, 2021 I do not have personal experience with it but I have been told VV powder can have a fair bit of variance between lots. Once again, only hearsay, no personal experience. Link to comment Share on other sites More sharing options...
d3ydx3 Posted January 4, 2021 Share Posted January 4, 2021 (edited) My minor load is 4.0gr of N320 @ 1.18" OAL. PF is around 140. Probably not helpful, but I load my major rounds at 1.135" OAL and 4.6gr of N320 for 165-169PF. All bullets are 180gr. Also, 5" barrel 1911. Edited January 4, 2021 by pealandco Link to comment Share on other sites More sharing options...
Aircooled6racer Posted January 13, 2021 Share Posted January 13, 2021 Hello: Chrono when changing lots of N320. It was one of the worst variations I have seen in powders lot to lot. I had one around the same as you but it was less, going minor from my usual 171PF to 154PF. Thanks, Eric Link to comment Share on other sites More sharing options...
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