...temps & pressure...

[wildgene]

...well, it's almost July, everyone's probably focusing on nailing down their "hunting loads", verifying their "target" loads, or a day out blasting away @ "varmints"...

...good article on "things" to consider during 'warm' weather...

http://bulletin.accurateshooter.com/201 ... is-summer/

 

[snoodcrusher]

Interesting read


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[DrMike]

Accuracy lies in attention to the "little" things (many of which are not as little as we might imagine).

 

[Horsethief]

I firmly believe a hot or even a warm barrel will bring faster velocities compared to the earlier or cold barrel loads. Several years ago I was testing 270 Win loads and had to wait almost five minutes for the barrel to cool. Shoot, cool, shoot, cool, etc., and the earlier in the day I shot the better. Duh.

In January I was able to do a lot of load testing on a 6.5mm Creedmoor. Having 35 and 40 deg temperatures is excellent shooting / load work up weather since it is close to the hunting temps of late November and December.

 

[Leslil]

Where are you at?
Minnesota is great in January. -20 it doesn't take long to cool

 

[257 Ackley]

We had our Thursday night 1000 yard league matches last night. Temps were around 80 degrees with a bit higher than normal humidity. At about shot 15 (22 minutes to shoot 22 rounds), my shots started to climb on me, as they did for several others. I shoot a straight 1.25, 30 inch barrel in 6BRX for these matches using 32.6 grains of Varget (not a hot load, but getting close). I guarantee you pressures were a lot higher than they were for matches shot two weeks ago. If you are shooting a typical hunting contour barrel it's best to shoot slow this time of year.

 

[257 Ackley]

Minnesota is great in January. -20 it doesn't take long to cool

I just leave for Florida and don't deal with the -20 stuff anymore...

 

[PJGunner]

I usually do my load works for new loads this time of year. Gets interesting when it's 110 in the shade and that ain't any shade. :roll: My thoughts are if it's a safe top load at 100 plus degrees, it should be OK come my hunt at 20 degrees. Where I elk hunt is in close proximity to the NRA's Whittington Center. Some of my loads use powders that are reputed to be temperature sensitive yet hit to the same POI as when worked up here at home. I dunno. :?: Maybe the roughly 5,000 feet MSL than the home range has something that possibly compensates for what the temperature takers away. All I know is WMR in the.270 and .300 Win. Mag. and W760 in the 30-06 all shoot to the same POI and no change in groups size as well. Same goes for Re15 in the Whelen. My only gripe about shooting this time of year is due to the heat, it takes literally forever for a barrel to cool down to match the outside air temperature. Can't do much until mid July due to other obligations but then I really have to get off the stick and get out to shoot. Biggest problem is getting up early enough get to the range when it opens up. By 7:30 every bench is taken and it is usually a long wait to get one. Then it's getting too hot got get much done unless you bring a half dozen rifles to work with. Shoot one while the others cool off. Oh well. Getting to be time to be getting it done although my hunt does not start till December 31. Maybe I;ll get my elk on New Year's Day. Be a great way to start a New Year. :lol: 8)
Paul B.

 

[Vince]

Having worked up loads during the fall and winter I noticed they were too hot in the spring and summer.
Now I do my workup in the summer heat, 100+, and find I have no issues in the fall and winter.

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[BillPa]

Its not so much the weather temp as the cartridge temp. If I going to shoot the ammo/load I'll be using in the fall/winter when the temps will usually be in the 30s-40s I'll put it in a cooler with a ice pack if the temps are in the 70s or higher. The cooler keeps it at about 40-50 degrees.

Bill