redwoods Posted April 29, 2007 Share Posted April 29, 2007 I live at 8150 feet in Colorado. If I shoot a 38super and it makes power factor up here, will it change if I go to Arizona or Florida? I know that golf balls go farther out here because of the less dense air. I am guessing that will also be true of my bullets. Redwoods Link to comment Share on other sites More sharing options...
AlamoShooter Posted April 30, 2007 Share Posted April 30, 2007 when I went form San Antonio to Colorado I did not get a mesurable change. Link to comment Share on other sites More sharing options...
shred Posted April 30, 2007 Share Posted April 30, 2007 I live at 8150 feet in Colorado. If I shoot a 38super and it makes power factor up here, will it change if I go to Arizona or Florida? I know that golf balls go farther out here because of the less dense air. I am guessing that will also be true of my bullets. Redwoods PF won't change to any reasonable amount. Long-range ballistics might, but unless you chrono at 100 yards, you'll be fine. Link to comment Share on other sites More sharing options...
Bear23 Posted May 8, 2007 Share Posted May 8, 2007 I lost 20 fps in my open gun going from 3600 feet and low humidity to 800 feet with higher humidity. Link to comment Share on other sites More sharing options...
shred Posted May 8, 2007 Share Posted May 8, 2007 I lost 20 fps in my open gun going from 3600 feet and low humidity to 800 feet with higher humidity. Wow, same temperature & chrono? 20 fps is a heck of a lot to lose for bashing through 10 feet of air. Link to comment Share on other sites More sharing options...
shane c Posted May 8, 2007 Share Posted May 8, 2007 i live in mississipi with hot weather and high humidity. i worked up a load with 7625 at a 171 pf in the colder months. went to arizona to shoot the world shoot qualifier and chronoed a 161. how in the world does my fps drop 70-80fps?? 80 degrees in arizona at the time by the way Link to comment Share on other sites More sharing options...
GentlemanJim Posted May 8, 2007 Share Posted May 8, 2007 Some powder will have a burn rate change ...up or down per temp. Test a known load a few rnds from the freezer....and some in the hot sun. Then you will see the diff. @ 40 deg my load was 166pf ...@80 deg it was 177pf Jim Link to comment Share on other sites More sharing options...
Jake Di Vita Posted May 8, 2007 Share Posted May 8, 2007 7625 has always been ultra reliable temperature wise for me. Are you sure that your powder measure didn't back off accidentally? Link to comment Share on other sites More sharing options...
shred Posted May 9, 2007 Share Posted May 9, 2007 I find 7625 to go faster when the temperature gets lower, which is 'backwards', but it works, especially as I usually end up chronoing in 95 degrees and 95% humidity.. Link to comment Share on other sites More sharing options...
dfwmiket Posted May 9, 2007 Share Posted May 9, 2007 I find 7625 to go faster when the temperature gets lower, which is 'backwards', but it works, especially as I usually end up chronoing in 95 degrees and 95% humidity.. Hmmm......thinking ahead to Area 4, maybe? Link to comment Share on other sites More sharing options...
shane c Posted May 12, 2007 Share Posted May 12, 2007 jake the powder measure didnt move. we measured it when i got back home. they were asking for new sun screens for the chrono and i think that might be the reason why.. bad chrono. see the same thing happend to BJ Norris. his pf went from 172 normal down to a 162 out there. Link to comment Share on other sites More sharing options...
BritinUSA Posted May 13, 2007 Share Posted May 13, 2007 My PF was the same at Rio as it is in Colorado. They only had a single chrono setup. I prefer to see two in sequence , the chances of getting two bad ones is incredibly remote. I heard part of the discussion about the screens so I went through the chrono at the end of the day and was okay. Link to comment Share on other sites More sharing options...
Bear23 Posted May 17, 2007 Share Posted May 17, 2007 I lost 20 fps in my open gun going from 3600 feet and low humidity to 800 feet with higher humidity. Wow, same temperature & chrono? 20 fps is a heck of a lot to lose for bashing through 10 feet of air. Well, the second chrono was the match chrono at DTC, not my CED. So who knows. Link to comment Share on other sites More sharing options...
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