Andy Posted March 24, 2003 Share Posted March 24, 2003 I normally shoot in the Sacramento area (100 or 200 feet above sea level) but would like to shoot the Best of the Best match in Reno. What effect can I expect from shooting at a higher elevation (however high Reno is). Also what effect will warmer temps have on PF? Andy Shooting 5.1 of vv n320 behind a 180 MG 40 S&W. Link to comment Share on other sites More sharing options...
BrianH Posted March 24, 2003 Share Posted March 24, 2003 If it's anything like 3N37, nothing will happen.... Link to comment Share on other sites More sharing options...
Flexmoney Posted March 24, 2003 Share Posted March 24, 2003 I think that Jeff Maass has posted that VV's reloading manual has data that can figure changes for temp. and elevation? Link to comment Share on other sites More sharing options...
BigDave Posted March 24, 2003 Share Posted March 24, 2003 I think what Jeff is saying is that VV 3N37, for example, is not sensitive to altitude and temp differences. I think the answer to your question as stated is that it depends on several factors. First and most obviousl is powder. Some a are sensitive to temperature and/or altitude, some are not. Second is OAL and free space in the loaded round which the powder has room to move. I'm sorry, but I think it really depends on all of those factors in concert. A different question you might pose is something like "I load with 4.5 grains of Titegroup under a Star 180 JHP @ 1.187" OAL, has anyone experienced PF changes due to altitude and temp". Not a better question, just different. Link to comment Share on other sites More sharing options...
lynn jones Posted March 24, 2003 Share Posted March 24, 2003 imho. i believe the humidity has more effect on velocity, than temp. more humidity, more air resitance, slower fps. lynn jones Link to comment Share on other sites More sharing options...
Angus Hobdell Posted March 24, 2003 Share Posted March 24, 2003 I have been using 3N37 for 10 years, it was originally designed a as rimfire powder!! I have used it EVRYWHERE in the world and never had a problem, from the altitude of Brazilia to the humidity of the philliphines, up mountains and down valleys. I have never had more then a 1 point deviation. If you are working with a new powder, try the temp test, one lot in a cooler and one lot warmed up. Its something I have done with new powders. Shame the manufactures don't have stats for this...... Link to comment Share on other sites More sharing options...
Vince Pinto Posted March 24, 2003 Share Posted March 24, 2003 Angus, From my recollections, you definitely had more than 1 point deviation in the Philippines. Huh? What's that?? Ohhhhhh. You're talking about bullets ......... Sorry Link to comment Share on other sites More sharing options...
lmccrock Posted March 25, 2003 Share Posted March 25, 2003 Angus, The manufacturers do publish temperature variations, when it suits them: Hodgdon Extreme But this is for their rifle powders only. Lee Link to comment Share on other sites More sharing options...
Shooter Grrl Posted March 25, 2003 Share Posted March 25, 2003 Andy, That's about the same load David uses in his .40 and he was absolutely fine in Reno last year. Link to comment Share on other sites More sharing options...
ErikW Posted March 25, 2003 Share Posted March 25, 2003 No worries with that load at that location at that time of the year. (Same powder and bullet I use.) I'd only worry about Viht. powders if I was close to the power factor floor and I was shooting in well below-freezing temps. Now if you had something like 231 you may be in trouble. Link to comment Share on other sites More sharing options...
Patrick Sweeney Posted March 27, 2003 Share Posted March 27, 2003 The manufacturers do have all that data, but for most reloaders it isn't relevant. Sure, a varmint shooter might notice a change in poi, going from low to high or vice versa. But a deer hunter? Never. The minute changes we're worried about fall within the changes the manufacturers deem allowable. So what (in the makers view) that going from the coast to the mountains your load went from 171PF to 164? That represents a 4% change in velocity, and when you consider how many variables are involved (temperature, humidity, air density, different chronograph, how much coffee you had for breakfast) posting charts for the changes is just asking for trouble. Link to comment Share on other sites More sharing options...
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