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Author Topic: .30 calibers at 28 yards  (Read 1005 times)

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Offline petemi

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.30 calibers at 28 yards
« on: September 28, 2010, 05:02:39 AM »
An old friend and army vet told me years ago that they sighted their .308s in at 1000 inches....27.7777 yards.  All my .30 caliber Handis are sighted in that way and are good to 300 yards.  Anyone else done that?

Pete
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Offline wreckhog

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Re: .30 calibers at 28 yards
« Reply #1 on: September 28, 2010, 05:23:07 AM »
Lets put it this way, I am never going to win the 200 yard egg shoot at my club doing that. I sight guns in at 25 yards and am often off 2 inches at 100 yards (acceptable for deer), and way more at 200 yards (unacceptable).
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Offline Spanky

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Re: .30 calibers at 28 yards
« Reply #2 on: September 28, 2010, 06:35:07 AM »
When we did BZO it was at 36 meters. That was our 300 meter zero.



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Offline thejanitor

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Re: .30 calibers at 28 yards
« Reply #3 on: September 28, 2010, 06:46:35 AM »
My father-in-law used to do that with -06. Said if you couldn't get to the range that you could be "close" at 100yds. And he did say 28 yds. I have never tested it, just remember him saying it.
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Offline necchi

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Re: .30 calibers at 28 yards
« Reply #4 on: September 28, 2010, 07:05:27 AM »
That's almost right, given the trajectory of the 30 cal bullets but not carved in stone.
It depends on bullet weight  and velocity of course, but it's generally closer to 27 yards and 200,,

A 180 put on at 27 will be 10-12"s low at 300,,there are several neet free ballistic calculators out there that can give ya a better idea where yer at esp if ya got a chrony,, ;)
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Offline canon6

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Re: .30 calibers at 28 yards
« Reply #5 on: September 28, 2010, 07:28:52 AM »
During the Dark Ages .ie; 1960 when I qualified with a M1 and in 61 or 62 when I qualified on the M14 we did the 1000 inch range. I still do any of the '30's using 150ish grain bullets..Using a 147 grain FMJ at approx2650 it puts the point of impact at 225 yards and 7.1 inch low at 300. Doug
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Offline wreckhog

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Re: .30 calibers at 28 yards
« Reply #6 on: September 28, 2010, 08:40:05 AM »
My Army officer (handguns only qualification) relative qualifies by shooting under the target to kick dirt up on it. Still counts.
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Offline eskimo36

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Re: .30 calibers at 28 yards
« Reply #7 on: September 28, 2010, 08:54:12 AM »
The 1000 inch rule was for open sights.   With a scope mounted a nominal 1.5" above bore line, the right distance is in the 35-38 yard range.  If you cant get to long range when you arrive at a hunt after travel, it is a quick way to check your gun if you have done your homework.
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Offline bikerbeans

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Re: .30 calibers at 28 yards
« Reply #8 on: September 28, 2010, 10:12:08 AM »
Pete,

Glad to see you sighting in your rifles @ 28 yards, now you are starting to take shots in the "ethical" range. ;D

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Offline moorepower

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Re: .30 calibers at 28 yards
« Reply #9 on: September 28, 2010, 10:46:10 AM »
Sighting at 28 will get your 100 yard zero real quickly. Alot of hight velocity rounds will intersect at 50yds and 250 ish yds.
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Offline jmayton

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Re: .30 calibers at 28 yards
« Reply #10 on: September 28, 2010, 12:44:40 PM »
I just did this with my M4, but at 50 so that I'm also zeroed at 200 and only 3" low at 245.  The reason this works, is the 2.6" sight height.  With a lower sight, this will change where the bullet cosses line of sight.  I couldn't do the same procedure wit my 30-06 nor my .223 Handi which shoots the same load as my M4.  To give you an idea, the handloads.com ballistic calculator (2900fps, 55gr, .250BC) puts the same load out of my Handi 1.9" low at 200 with 50yd zero as opposed to .01" with the M4.  The only change is .6" lower sight height for the Handi.

I know that the Marine Corps sights in at 36, but then they also shoot at 300.  As far as I know, the only way to know where the bullet hits at a given range is to shoot at that range.  Sight height, barrel length, velocity, and BC all play a factor.

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Offline moorepower

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Re: .30 calibers at 28 yards
« Reply #11 on: September 28, 2010, 01:06:30 PM »
My .243 is actually .7 high at 50yds, and the 7mm mag is .6 high at 50. If you aim at the center of a 6" pie plate with either of these, it will hit the plate from 50 to 300 yards and with the 7 just a tad further. My point is that if you zero at 50 to start, you will kill anything coyote size or larger if you aim at center mass to 300 yards. It is also way quicker to sight in at 50 or even 25 yards before you even go to 100 yds. I actually shoot 1.5 high at 100, then check at 200 and 300 yds.
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Offline Dinny

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Re: .30 calibers at 28 yards
« Reply #12 on: September 28, 2010, 04:45:23 PM »
Quote from: wreckhog on September 28, 2010, 08:40:05 AM
My Army officer (handguns only qualification) relative qualifies by shooting under the target to kick dirt up on it. Still counts.

Your relative must be shooting at the pop-up targets. The dirt and rocks flying usually knock them over, they don't even have to be all that close either. When I'm the RSO, they get a little help in another way. I usually will shoot next to them and put enough in their paper targets to qualify them. Our (NCOs) thought is that they (Officers) don't need good aim with a firearm...I hope their aim is better with a laser pointer...power point. ;D

Thanks, Dinny
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Offline billy_56081

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Re: .30 calibers at 28 yards
« Reply #13 on: September 28, 2010, 05:33:34 PM »
The point of where the bullet crosses the line of sight on the upward part of the trajectory is different with different sight heights. That is why when you use a ballistic calculator you must put in the distance of the sight above the center of the bore.
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