SilverBolt Posted April 5, 2018 Share Posted April 5, 2018 Used up the last of our IMR-7625 for 9-Major and making the switch to WAC/AC for now. Any temperature issues either hot or cold? Link to comment Share on other sites More sharing options...
Bkreutz Posted April 5, 2018 Share Posted April 5, 2018 26 minutes ago, SilverBolt said: Used up the last of our IMR-7625 for 9-Major and making the switch to WAC/AC for now. Any temperature issues either hot or cold? Not that I've noticed. I've been using AC for over 3 years and I load it to 172PF, never had it go below 170 at a number of majors. The temperature varied from around 40 degrees to over 100. Link to comment Share on other sites More sharing options...
Sprig Posted April 5, 2018 Share Posted April 5, 2018 Never noticed it either , seems pretty consistent . Link to comment Share on other sites More sharing options...
tcazes Posted April 6, 2018 Share Posted April 6, 2018 for me, 4.6 wac at 1.165 (40 200gr bbi) is 171.2pf at 70f. at 33f that exact same load, same batch and all was 166.4pf. both test batches were loaded at the same time and shot after one full mag was used to warm the gun up. i dont know if it would drop any further but i definitely get a drop in pf. Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted April 6, 2018 Share Posted April 6, 2018 2 hours ago, tcazes said: 4.6 gr WAC (40 200gr bbi) is 171.2pf at 70 f. At 33 f was 166.4pf. That's a large frop (171 to 166). BUT, different caliber, much lower quantity of powder ??? Link to comment Share on other sites More sharing options...
tcazes Posted April 6, 2018 Share Posted April 6, 2018 15 minutes ago, Hi-Power Jack said: That's a large frop (171 to 166). BUT, different caliber, much lower quantity of powder ??? idk how it would be for different calibers. this was in 40. i will try it with my open loads as soon as it gets cold again. Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted April 6, 2018 Share Posted April 6, 2018 1 minute ago, tcazes said: idk how it would be for different calibers. this was in 40. i will try it with my open loads as soon as it gets cold again. Well, looking for a possible explanation why you would find a large difference whereas neither Bkreutz nor Sprig (above) saw any difference from 40 F to 100 F. Only difference in the equation is the caliber and amount of powder. I use a LOT of WAC in 9mm Major, but never checked PF in cold weather. Link to comment Share on other sites More sharing options...
tcazes Posted April 6, 2018 Share Posted April 6, 2018 4 minutes ago, Hi-Power Jack said: Well, looking for a possible explanation why you would find a large difference whereas neither Bkreutz nor Sprig (above) saw any difference from 40 F to 100 F. Only difference in the equation is the caliber and amount of powder. I use a LOT of WAC in 9mm Major, but never checked PF in cold weather. i use it for 9 major and 40. i could definitely see powder charge making a difference since the higher i push my 9maj loads the smaller the sd gets and it seems to burn better. 7.1 is my go to and super consistent so maybe charge is the issue. i know at 4.6 its definitely a larger sd than at 7.1 lol Link to comment Share on other sites More sharing options...
SilverBolt Posted April 6, 2018 Author Share Posted April 6, 2018 I did my chrono testing at 38F. 7.2gr with a MG 124CMJ 1.17 OAL got me a 171PF from my open gun and a 168PF from my wife's. These were 10 round averages. Link to comment Share on other sites More sharing options...
tcazes Posted April 6, 2018 Share Posted April 6, 2018 12 minutes ago, SilverBolt said: I did my chrono testing at 38F. 7.2gr with a MG 124CMJ 1.17 OAL got me a 171PF from my open gun and a 168PF from my wife's. These were 10 round averages. sooooooo. have you done it in warmer temps? did it change? thats the question here Link to comment Share on other sites More sharing options...
SilverBolt Posted April 6, 2018 Author Share Posted April 6, 2018 17 minutes ago, tcazes said: sooooooo. have you done it in warmer temps? did it change? thats the question here Not yet. Hoping in the next few weeks we have a warm spell so I can do additional testing. I feel comfortable on the cold end that our load is good. I know some powders have a negative affect in the heat. Sounds like AC is pretty stable. Link to comment Share on other sites More sharing options...
echotango Posted April 7, 2018 Share Posted April 7, 2018 Never noticed, chrono'd in all temps. Shoot from 25'-117'. Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted April 7, 2018 Share Posted April 7, 2018 9 hours ago, echotango said: Never noticed, chrono'd in all temps. Shoot from 25'-117'. Just to be safe, are you saying that you have chrono'd WAC rounds from 25 F. to 117 F. and that you have NOT observed any difference in PF ? Link to comment Share on other sites More sharing options...
echotango Posted April 7, 2018 Share Posted April 7, 2018 I have shot it in those temps and have chrono'd in ~35'-117'. I average the same pf regardless. Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted April 7, 2018 Share Posted April 7, 2018 So, the plot thickens. We have three people (Bkreutz, Sprig and Echo) who have measured NO temperature variation with WAC, and we have tcazes who has chrono proof that a .40 load is temperature sensitive. Can't wait for the final results on this one Link to comment Share on other sites More sharing options...
tcazes Posted April 8, 2018 Share Posted April 8, 2018 We never get super cold weather down here in louisiana so when it snowed this year our rangemaster thought I was nuts but I looked like a kid in a candy store excited to go get some data. I chronoed a whole box of ammo that day lol. Sure enough at the next major match it got super cold and did the same thing so my .02 cents is my .02 cents but I sure trust it. Link to comment Share on other sites More sharing options...
Knguyen1904 Posted April 10, 2018 Share Posted April 10, 2018 I’ve been shooting it for a few months from sub 10 degree weather up to 50 degrees. Haven’t had any issues with it making pf. Link to comment Share on other sites More sharing options...
SWprotected Posted April 10, 2018 Share Posted April 10, 2018 I used WAC all year last year in my open gun and was consistently at 173-174pf. That is on my chrono as well as match chronos. Temps were from the 30s up to mis 90s at matches I shot last year. Link to comment Share on other sites More sharing options...
sc68cal Posted April 16, 2018 Share Posted April 16, 2018 I've seen a variance of ~1-2 PF between 40*F and 85*F at chrono with the same ammunition - although the chrono I've used versus the chrono at a match are by different manufacturers (Caldwell Chrono vs. Competitive Edge Dynamics), so the variance is mostly just statistical noise. Overall I do not believe WAC is temperature sensitive in any significant manner. Link to comment Share on other sites More sharing options...
SilverBolt Posted April 16, 2018 Author Share Posted April 16, 2018 Thank you all. Sounds like we will be plenty safe. Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted April 16, 2018 Share Posted April 16, 2018 On 4/7/2018 at 11:30 AM, Hi-Power Jack said: So, the plot thickens. We have three people (Bkreutz, Sprig and Echo) who have measured NO temperature variation with WAC, and we have tcazes who has chrono proof that a .40 load is temperature sensitive. Can't wait for the final results on this one Plot is getting thicker Now we have five people who have measured no temp sensitivity with WAC .... Link to comment Share on other sites More sharing options...
Bkreutz Posted April 16, 2018 Share Posted April 16, 2018 I have to qualify my previous statement. I've noticed some of the comments about sensitivity were about very cold temps. I didn't notice that because my trigger finger quits working at 40 degrees. Link to comment Share on other sites More sharing options...
Hi-Power Jack Posted April 17, 2018 Share Posted April 17, 2018 1 hour ago, Bkreutz said: my trigger finger quits working at 40 degrees. So does my brain Link to comment Share on other sites More sharing options...
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