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rifle setup

 
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  #1  
Old 09-07-2009, 07:52 PM
TH TH is offline
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rifle setup

I have ben doing load development all summer long. I finally found a load that shoots great in my rifle. I cronographed my load at 3278 fps at 900 feet of elevation and 60 degreese outside temp. When I go hunting next month base camp will be at 9000feet and hunting in elevations up to 14000 feet. When i imput the information in my sierra program will my load speed stay the same at this elevation. The temp will be colder where im hunting probally around 30 degrees. Im shooting H50bmg powder.
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Old 09-08-2009, 02:51 PM
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Re: rifle setup

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Originally Posted by TH View Post
I have ben doing load development all summer long. I finally found a load that shoots great in my rifle. I cronographed my load at 3278 fps at 900 feet of elevation and 60 degreese outside temp. When I go hunting next month base camp will be at 9000feet and hunting in elevations up to 14000 feet. When i imput the information in my sierra program will my load speed stay the same at this elevation. The temp will be colder where im hunting probally around 30 degrees. Im shooting H50bmg powder.


What caliber are you shooting? What grain bullet?

Tank
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Old 09-08-2009, 08:13 PM
TH TH is offline
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Re: rifle setup

338 408 300grn smk
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Old 09-10-2009, 07:07 PM
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Re: rifle setup

30 degree lower temp will probably make around 40 to 50 feet less velocity. You will have to test to make sure as powders vary. Try shooting in warmer weather and chronograph at above 70 degrees and then ice your loads (and chamber/barrel) and note the difference. Also leaving a round chambered very long in a hot chamber will have the same affect i.e. (raise pressure/velocity)
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Old 09-10-2009, 09:09 PM
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Re: rifle setup

Quote:
Originally Posted by TH View Post
I have ben doing load development all summer long. I finally found a load that shoots great in my rifle. I cronographed my load at 3278 fps at 900 feet of elevation and 60 degreese outside temp. When I go hunting next month base camp will be at 9000feet and hunting in elevations up to 14000 feet. When i imput the information in my sierra program will my load speed stay the same at this elevation. The temp will be colder where im hunting probally around 30 degrees. Im shooting H50bmg powder.

Both the temperature change AND the elevation change will affect velocity and your POI.

Does your ballistic program have a trajectory validation? if so, when you get to your hunting spot, you can verify your trajectory and be good to go.
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Old 09-11-2009, 11:24 AM
TH TH is offline
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Re: rifle setup

What would you guys recomend. Take my cronograph with me and shoot a few over before i hunt? I also have a PDA with the nightforce program. So i can adjust my drop charts my biggest concern was change in velocity.
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Old 09-11-2009, 11:35 AM
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Re: rifle setup

Just ice your ammo and take a cold bore shot over a chrono. This will get you awful close. The elevation will not change your muzzle velocity, just the temperature. Let your rifle cool for 30 minutes then take another shot with the iced ammo. As was said earlier, you'll probably get 30-50fps less.

I hunt with a 338Allen Magnum and use 3270fps as my velocity, the JBM Litz data for the 300smk works VERY well for my drops up to and past 1200yds.

AJ
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