jstagn Posted March 10, 2014 Share Posted March 10, 2014 Chrono 9mm 147 gr. load 3.2 grains Vit N 320 at 55-60 degrees today. How temp sensitive is n320? I know clays gets slower at lower temps. Link to comment Share on other sites More sharing options...
bowenbuilt Posted March 10, 2014 Share Posted March 10, 2014 If it is I have never noticed it but Clays and WST have put me in a bind a few times and were very noticeable. One when very cold and the other when it was warm and sunny. Link to comment Share on other sites More sharing options...
tulsashooter45 Posted March 10, 2014 Share Posted March 10, 2014 My experience with 320-310 is it pretty much stays the same year round. Only wish it was easier to find these days Link to comment Share on other sites More sharing options...
joshxdm9 Posted March 10, 2014 Share Posted March 10, 2014 I just started using n320 for 180g bayou .40 major. Checked in cold weather down to around 30° then rechecked last weekend 55° no change. Link to comment Share on other sites More sharing options...
jstagn Posted March 10, 2014 Author Share Posted March 10, 2014 THANKS............. Link to comment Share on other sites More sharing options...
ttolliver Posted March 11, 2014 Share Posted March 11, 2014 I was digging for exactly the same info mid-winter. The VV manual states their powders have a 1% velocity increase and 3% case pressure increase with each 18 degree (f) temperature increase. They don't specify a specific powder with this but rather leave it as a generalized statement -- perhaps because all of their powders share the same chemical basis. Link to comment Share on other sites More sharing options...
CZinSC Posted March 11, 2014 Share Posted March 11, 2014 I always see people say that N320 is not temp sensitive. i disagree 100% with my own first hand experience. In my CZ SP01, every year, when the temp drops to about 30-40 degrees, I lose about 20-30 fps. ( compared to 70-80 degrees ). Link to comment Share on other sites More sharing options...
JimInFL Posted March 11, 2014 Share Posted March 11, 2014 my experience... I live in central FL. A couple years ago I loaded my sons 9 minor loads with N320 at 129 PF (love that powder). I loaded my 9 major loads with Silhouette at 169-170 pf. Was at least in the 80's here temp-wise. We went to the GA State match, and the morning we chrono'd, you could see your breath. He was 129 PF, I was 176. I'm a believer in the temp stability of N320 - at least for the areas I shoot in. JimInFL Link to comment Share on other sites More sharing options...
RDA Posted March 11, 2014 Share Posted March 11, 2014 The VV manual states their powders have a 1% velocity increase and 3% case pressure increase with each 18 degree (f) temperature increase. In my CZ SP01, every year, when the temp drops to about 30-40 degrees, I lose about 20-30 fps. ( compared to 70-80 degrees ). Which is approximately the 1% velocity decrease every 18 degree decrease noted above. Link to comment Share on other sites More sharing options...
Red Ryder Posted March 11, 2014 Share Posted March 11, 2014 (edited) The VV manual states their powders have a 1% velocity increase and 3% case pressure increase with each 18 degree (f) temperature increase. In my CZ SP01, every year, when the temp drops to about 30-40 degrees, I lose about 20-30 fps. ( compared to 70-80 degrees ). Which is approximately the 1% velocity decrease every 18 degree decrease noted above. No change in my experience that would put me in a bind, but then again I don't load to 125.9 PF. Maybe the change in temp affects your barrel too, slowing down the bullet. Edited March 11, 2014 by Red Ryder Link to comment Share on other sites More sharing options...
Yagi Posted March 11, 2014 Share Posted March 11, 2014 Im from vegas... No change... 20deg up to 120 degrees.... Link to comment Share on other sites More sharing options...
kevin c Posted March 11, 2014 Share Posted March 11, 2014 My personal experience with N320, shooting ten shot strings, is that the first rounds are always the slowest and the later rounds the fastest. I have always thought that the increase in velocity was related to the chamber and barrel heating up, and increased temperature due to heating of the subsequently chambered rounds. I explained that to somebody who told me I was wrong, that the barrel heating caused expansion and therefore less friction to retard the bullet, but I would think you'd lose velocity because of gas blow by, but what do I know. I'll stick with round heating. ;^) Link to comment Share on other sites More sharing options...
GlockCanMan Posted March 12, 2014 Share Posted March 12, 2014 I use VV N320 and have not noticed any difference on my loads...the lowest temp that I tried was 50 degrees F. and the highest was 98 degrees F. and I had no differences according to my records. Link to comment Share on other sites More sharing options...
jstagn Posted March 12, 2014 Author Share Posted March 12, 2014 Good observations. Clays seems faster the more temps go up, but I have not seen any figures like the 1% that Vit specifies. Link to comment Share on other sites More sharing options...
sclagg Posted February 12, 2015 Share Posted February 12, 2015 Good discussion.. I'll know for sure Sat at the Open. Link to comment Share on other sites More sharing options...
Service Desk Posted February 12, 2015 Share Posted February 12, 2015 I always see people say that N320 is not temp sensitive. i disagree 100% with my own first hand experience. In my CZ SP01, every year, when the temp drops to about 30-40 degrees, I lose about 20-30 fps. ( compared to 70-80 degrees ). My experience has been similar.... n310 is a bit better, but not enough to make me change. Link to comment Share on other sites More sharing options...
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