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270 Win 100 yd zero

 
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  #1  
Old 09-26-2011, 10:01 AM
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270 Win 100 yd zero

Hey fellas, zeroed my little 270 in this morning. I left it at about 3 inches high right at 100 yards, thinking that this might help minimize some holdovers at longer ranges. Can anyone kind of break it down as far as how much this might decrease holdover? Or should I just knock my zero down to 2 inches high?

BTW, shooting a 130 BT at an estimated 3250 fps, 26 inch barrel+ 63.5 gr of Magpro.
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Old 09-26-2011, 10:54 AM
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Re: 270 Win 100 yd zero

You're much better off verifying the zero at 200 yards and beyond. I've had rifles that I set 2 inches high at 100 that go to 6 inches high at 200 though I haven't touched a thing. Why? I don't know, but I don't trust the 100 yard zero without verifying beyond that.
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Old 09-26-2011, 11:14 AM
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Re: 270 Win 100 yd zero

All my rifles that are not bench guns are set dead on at 100yrds from there I use mildots for the ones that have them but for the others I adjust the crosshair as needed but I do not reccomend doing this with el cheapo optics as they may not track back like they should, but this is the best way, and I think your load is likely closer to 3160 +or- 20fps.
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Old 09-26-2011, 11:44 AM
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Re: 270 Win 100 yd zero

I'm definitely going to check at 200. Shooting at 415 I hold directly on. And I'm pretty comfortable in stating that my load is running over 3200 fps, my barrel is longer than what Accurate used in testing Magpro, and knocked down from their max by just 1.5 grains
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Old 09-26-2011, 01:12 PM
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Re: 270 Win 100 yd zero

You can calculate you're trajectory here...

JBM - Calculations - Trajectory
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  #6  
Old 09-26-2011, 01:38 PM
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Location: Halfway between Lubbock and Dallas
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Re: 270 Win 100 yd zero

Quote:
Originally Posted by TannerGun View Post
Hey fellas, zeroed my little 270 in this morning. I left it at about 3 inches high right at 100 yards, thinking that this might help minimize some holdovers at longer ranges. Can anyone kind of break it down as far as how much this might decrease holdover? Or should I just knock my zero down to 2 inches high?

BTW, shooting a 130 BT at an estimated 3250 fps, 26 inch barrel+ 63.5 gr of Magpro.
That would put you pretty close to a 285yd zero.

Ballistics Calculator v1.0

I find their ballistic calculator very handy.

Ballistics Calculator - Hornady Manufacturing, Inc
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  #7  
Old 09-26-2011, 01:44 PM
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Re: 270 Win 100 yd zero

Quote:
Originally Posted by TannerGun View Post
I'm definitely going to check at 200. Shooting at 415 I hold directly on. And I'm pretty comfortable in stating that my load is running over 3200 fps, my barrel is longer than what Accurate used in testing Magpro, and knocked down from their max by just 1.5 grains
If you are dead zeroed for 415 with that your numbers need to be adjusted.

What BC bullet are you using?
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