.308 @ 1260

[coldboremiracle]

.308 win 24" 10 twist barrel, 175smk 44.0 gr RL-15 mv about 2675 fps. 1260 yds on about a 5 degree up angle. 30f, no wind to speak of, maybe a slight 1 mph from 11 o'clock. How much elevation/windage should it have taken to get there?

I only ask because there was a bit of discussion amongst us.

 

[Captain Kirk]

Re: .308 @ 1260

I'll go first, without knowing the evelation or baro pressure, how bout 16.38 mils (56.3 moa) elev, 4.4 mils (1.28 moa) right wind

........HIT........reload.......HIT.......

 

[coldboremiracle]

Re: .308 @ 1260

Sorry, elevation was near 4300 and couldn't tell you on the baro.

 

[desertHK]

Re: .308 @ 1260

Exbal says 44.5 MOA up, 1/2 MOA left. for the approximate 4300 feet in elevation.

 

[MontanaMarine]

Re: .308 @ 1260

I'd guess around 52 moa el, maybe .25 moa wind.

 

[Niles Coyote]

Re: .308 @ 1260

Drop from 100 yard zero, 15.9 mil or 54.7 moa ----- drift .4 mil or 1.2moa per 1mph @ full value, so I will go with MontanaMarine @ about .25 moa

 

[coldboremiracle]

Re: .308 @ 1260

The confusing thing was how in the same area and pretty much the same conditions we had different results.the first time I was shooting with 48moa. but for this time(the one in the picture) Montana marines estimate is closest. I was shooting right at 52moa and holding about two minutes for the wind. It sure is fun to stretch out the .308, but it can be hard to spot the impact at that range.

 

[rijndael]

Re: .308 @ 1260

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: coldboremiracle</div><div class="ubbcode-body"> pretty much the same conditions</div></div>

Same pressure?

 

[Guest]

Re: .308 @ 1260

I'd do 54.25 IPHY, and 1 IPHY left, with my stick, (I run a canted retical)

 

[GCMxVeGeTa]

Re: .308 @ 1260

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: KRock459</div><div class="ubbcode-body">I'll go first, without knowing the evelation or baro pressure, how bout 16.38 mils (56.3 moa) elev, 4.4 mils (1.28 moa) right wind

........HIT........reload.......HIT....... </div></div>

4.4 mils is way more than 1.28 MOA. Maybe you meant .44 mils.

 

[Captain Kirk]

Re: .308 @ 1260

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: GCMxVeGeTa</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: KRock459</div><div class="ubbcode-body">I'll go first, without knowing the evelation or baro pressure, how bout 16.38 mils (56.3 moa) elev, 4.4 mils (1.28 moa) right wind

........HIT........reload.......HIT....... </div></div>

4.4 mils is way more than 1.28 MOA. Maybe you meant .44 mils. </div></div>

Na, typo, I meant 1.28 mils, or 4.4 moa. Plus I just realized wind was 1 mph, dont know how I read 7 mph.....I missed the shite out of that target.

Wind should be around .18 mils (.6 moa)

Kirk R

 

[coldboremiracle]

Re: .308 @ 1260

Well at least I'm not the only one who missed the first shot,

...........miss......reload.......HIT

 

[Short-bus]

Re: .308 @ 1260

A 48 to 52moa change in elevation correction at that range with identical temps would be a pressure difference. Unless it's something that you have the ability to measure, you aren't going to notice it just by sticking your thumb in the air. I ran some numbers with pressure changes that i've seen here of at least 1", and sometimes more, and my load at 1300 yards shows a 2+moa change. Your difference could be a coupling of factors like a pressure difference, temperature difference, and humidity difference, ammo velocity a little lower for whatever reason. All these combined will stack up the error at that range.

Branden

 

[coldboremiracle]

Re: .308 @ 1260

Thanks for all the input guys.

 

[MontanaMarine]

Re: .308 @ 1260

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: coldboremiracle</div><div class="ubbcode-body">..I was shooting right at 52moa and holding about two minutes for the wind...</div></div>

Wind conditions along thwe way were probably more than what was happening at your firing point. The bullets path would have been about 20' above LOS at max ord.

Probably a little spin-drift in the equation too.

 

[308sako]

Re: .308 @ 1260

deleted in protest!