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Zero in Fl to shoot in Mt

 
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  #1  
Old 02-17-2014, 09:28 PM
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Zero in Fl to shoot in Mt

I zero in Florida, 90 degrees, near sea level, high humidity, to hunt in Montana, 20 to 40 degrees, 4000 ft altitude, low humidity. Is there some way to adjust my Fl zero to approximate Montana conditions or must I re zero in Montana. A long shot would be 350 yards.
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Old 02-17-2014, 10:57 PM
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Re: Zero in Fl to shoot in Mt

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Originally Posted by 1947flaboy View Post
I zero in Florida, 90 degrees, near sea level, high humidity, to hunt in Montana, 20 to 40 degrees, 4000 ft altitude, low humidity. Is there some way to adjust my Fl zero to approximate Montana conditions or must I re zero in Montana. A long shot would be 350 yards.
At what range do you zero your gun at? It will defiantly have less drop up here then you would in Florida. I would say for the first 300 to 400 yards its not a really big deal. But it will make a BIG difference out beyond 500 and up. I would feel you would be safe to zero it @ 100 or 200 yards and just go with that up here. BUT it could not hurt to shoot a couple rounds up here to see how close it will be. My guess is it will still be right on if you zero it @200 yards. maybe .2" high but more then likely it will be spot on.

Have fun!! Montana is a great state to hunt in!
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Old 02-18-2014, 12:32 PM
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Re: Zero in Fl to shoot in Mt

Use the G7 ballistics calculator above you can put in the conditions where you sighted in your rifle then change the elevation, temperature, wind and pressur re calculate and It will give you the changes.
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Old 02-18-2014, 12:44 PM
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Re: Zero in Fl to shoot in Mt

My 300WM was zeroed at 200yd in NC at 500 feet. Went to Co mid Sept to hunt, the temperature was about the same, and the POI was about 1.5" higher due to the 6000 ft altitude difference. Fast forward a year; went back around Thanksgiving to the same area and the POI shifted 3" low due to the major temperature drop. Same exact loads, same rifle, same 200 yd zero before the hunt. While the ballistic calcs may handle the altitude and air temp shift ok, I doubt your data regarding velocity change due to temperature will be adequate and will require shooting to insure proper performance.

Related to that, I always leave my rifle and ammo outside in the truck to stay acclimated to the conditions of the hunt for consistency after zeroing.
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Old 02-18-2014, 03:01 PM
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Re: Zero in Fl to shoot in Mt

There are a lot of things to take into consideration, are you using a ballistic app? How confident are you in your input data? Do all your drops work out to your out put data,(check this by actually shooting for drops). Are you using temp stable powder?

If the answer to these questions are yes, if you put in all the correct data from your hunting area you should be good to go. But you still may want to take a couple of confidence shoots if you feel the need. I sighted in here in Indiana, 500ft elevation went to Wy. last year made a 803 yd. shot on a muley. One shot one kill and didn't take any sighters, but my confidence was high because I knew all my ducks were in a row.
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Old 02-18-2014, 03:28 PM
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Re: Zero in Fl to shoot in Mt

The chart is to get you close it is always smart to take a couple test shots as scopes can get bumped in travel by on of your partners and they may not tell you. The velocity drop in the barrel is not going to be enough to matter.
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Old 02-19-2014, 11:19 AM
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Re: Zero in Fl to shoot in Mt

Quote:
Originally Posted by 264WM View Post
The chart is to get you close it is always smart to take a couple test shots as scopes can get bumped in travel by on of your partners and they may not tell you. The velocity drop in the barrel is not going to be enough to matter.
I agree. We have all of our hunters re-zero due to travel. If a LR hunter showed up we verify zero and 500 for drop especially for guys who don't use temp stable powders. However for 350 or less POI shift due to velocity change should not be an issue.
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