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What distance to zero your rifle?
#11
DaveM55;48607 Wrote:This needs to be a sticky.

Great visual explanation with side-by-side comparisons.

Now my question is how much does bullet weight and barrel length effect these results?

Faster speeds, gained through lighter bullets or longer barrels will shrink the spreads. That's what hunters mean by "flat shooters". My STW only varies 8 inches from the muzzle to almost 600 yards.

To switch things up even more, you can use the turrets on some sights to adjust the zeros to differing conditions. I often switch my zero several times in a day while hunting and based on the conditions.
lycanthrope, proud to be a member of pa2a.org since Sep 2012.
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#12
For 99% of the people using a "tactical" rifle on this forum, a USMC IBZ is by far your best bet.

Anyone got a ballistic calculator program? I'm stuck in Philly, which blows in that it has no good rifle ranges. The local range i've been using is 15 yards. Can someone please list me the POI's for a .22LR 30grain flat nose solid @ 1750 fps mv with a 3" sight height zeroed at 15 yards? And more importantly, how low should i be shooting at 15 yards with a 50 yard zero at that range, so i can simulate a 50 meter zero?

Thanks in advance!
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#13
Valorius;48667 Wrote:For 99% of the people using a "tactical" rifle on this forum, a USMC IBZ is by far your best bet.

Anyone got a ballistic calculator program? I'm stuck in Philly, which blows in that it has no good rifle ranges. The local range i've been using is 15 yards. Can someone please list me the POI's for a .22LR 30grain flat nose solid @ 1750 fps mv with a 3" sight height zeroed at 15 yards? And more importantly, how low should i be shooting at 15 yards with a 50 yard zero at that range, so i can simulate a 50 meter zero?

Thanks in advance!

If you have a smart phone Strelok is a great program in the field for short to mid ranges.

With your setup, you're shooting 5.87 inches high at 50 and 11.02 inches high at 100.

For a 50 yard zero, you need to be 1.77 inches LOW at 15.

I'm not used to that high of an optic and that fast of a drop. Had to wrap my head around that.
lycanthrope, proud to be a member of pa2a.org since Sep 2012.
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#14
The 1.77 is the number i needed. That should give me a MPBR of about 150 meters or thereabouts with the Aguila Supermax 30gr plated solid rd.

Thanks!

I'll check into the strelok app too. Smile

3" is pretty typical on a flat top AR with co-witnessed optics and irons.
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#15
I mount my optics lower for better cheekweld.
lycanthrope, proud to be a member of pa2a.org since Sep 2012.
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#16
lycanthrope;48653 Wrote:
DaveM55;48607 Wrote:This needs to be a sticky.

Great visual explanation with side-by-side comparisons.

Now my question is how much does bullet weight and barrel length effect these results?

Faster speeds, gained through lighter bullets or longer barrels will shrink the spreads. That's what hunters mean by "flat shooters". My STW only varies 8 inches from the muzzle to almost 600 yards.

To switch things up even more, you can use the turrets on some sights to adjust the zeros to differing conditions. I often switch my zero several times in a day while hunting and based on the conditions.

Newb here, what is an STW and what caliber is that?
Certified NRA LE Handgun/Shotgun Instructor
Pa ACT235 Firearms Instructor
Speed is fine, accuracy is final.

U.S. Navy veteran
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#17
lycanthrope;48755 Wrote:I mount my optics lower for better cheekweld.

I agree with the notion, but the AR doesn't like to play that game. That's why you see the cheek piece on some 20 and 24" AR's.
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#18
DaveM55;48771 Wrote:
lycanthrope;48653 Wrote:Faster speeds, gained through lighter bullets or longer barrels will shrink the spreads. That's what hunters mean by "flat shooters". My STW only varies 8 inches from the muzzle to almost 600 yards.

To switch things up even more, you can use the turrets on some sights to adjust the zeros to differing conditions. I often switch my zero several times in a day while hunting and based on the conditions.

Newb here, what is an STW and what caliber is that?

STW's are named after the magazine Shooting Times. There are Shooting Times Westerner and Shooting Times Easterner calibers. I shoot a 7mm STW. It was brought about by Layne Simpson who was the editor of that magazine. It was a ballistic predecessor to the Ultra mags. Essentially, it's an 8mm Remington Magnum necked down to 7mm.

Valorius;48774 Wrote:
lycanthrope;48755 Wrote:I mount my optics lower for better cheekweld.

I agree with the notion, but the AR doesn't like to play that game. That's why you see the cheek piece on some 20 and 24" AR's.

The 4 AR's I have play that game quite well. I don't use cheekpieces on the AR's. I tend to use lower mounts. I use a cheekpiece on the STW since 30mm tubes and 20moa down-angle mounts get the optic way up there.
lycanthrope, proud to be a member of pa2a.org since Sep 2012.
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#19
If you use the lower mounts you can't co-witness the iron sights, or at least you cant with any set up i've messed with (IOW, maybe you can with some other set up). Especially with the carbine stock.

I do agree that a lower sight plane is far more ideal though.
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#20
And a .243 shooting 75 grain Hornady V-Max's has the same trajectory as the factory loaded 7mm STW, just less kinetic energy... I've tried shooting to 550 yards, I'm not good enough, and I'm ok with that... lol

Oh, by the way, I have some .243 brass for you. Mrs. Chaz's 2 year anniversary present was a Rossi .243 and she loves it... lol


-Chaz
I love guns... And boobs...
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