Sighting in Scope and Heat questions

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[ARCHIVED THREAD] - Sighting in Scope and Heat questions

Posted: 8/21/2003 8:26:15 AM EDT

After having two bad experiences with a HESSE and getting my money back. I had purchsed a Bushmaster. The other day was the first day that I have had to shoot after back surgery and was trying to sight in my scope. Being that I only had around 30 yds. to shoot if you sight in at 25 yds isn't it the same at either 100 yds. or is it 200 yds? I can't remember.

Also, I fired 30 rounds, one right after the other. When I finished, I was going to let my nephew shoot it but the handguard was extremely hot. It was hot outside as well, about 85 degrees. I had to put it in the truck with the A/C on for about 15 minutes before it cooled off. Any suggestions on the handguard or is this really to be expected?

Posted: 8/21/2003 8:52:57 AM EDT

[#1]

25 will give you bulls at 100 and 300 (called battle sight zero).

There is a handguard sold that has an improved heat shield, although I can't remember who sells it.
Rapid fire will cause heat to build quickly, not a problem for the weapon, just uncomfortable for the shooter.

Posted: 8/21/2003 9:04:01 AM EDT

[#2]

Thanks Gunslinger.

I will try and find out on the handguard.

Posted: 8/21/2003 9:42:42 AM EDT

[#3]

Quoted:
25 will give you bulls at 100 and 300 (called battle sight zero).

View Quote

I don't think this is quite right.

You can't have it zeroed at one distance and then cross back over twice. It can only cross the zero one more time.

I believe, (not sure) the standard battle zero is 25 Meters with a second zero at 200 Meters.

25 yards should get you at 260 yards with .223 remington fmj 55gr(UMC L223r3).

Posted: 8/21/2003 10:00:17 AM EDT

[#4]

If you shoot at 25 meters, the bullet is just begining it's arc, so it hits the ten ring.
as it passes through 100 and 300 meters it is at the same point in it's arc, and as such is able to hit the same spot.
It's worked for the Marines for years.

Posted: 8/21/2003 10:20:38 AM EDT

[#5]

Maybe I misunderstand the question...

Ok, if you zero at 25, then it hits the center/x on the paper at 25, it is on its way up.

Then if comes down, how can it come down at 100 [b]and[/b] 300?

edited to fix the picture
[img]http://iceknightconsulting.com/traj.jpg[/img]

Posted: 8/21/2003 10:37:05 AM EDT

[#6]

[url]http://groups.msn.com/TheMarylandAR15ShootersSite/zeroingmethods.msnw[/url]

I found the best info here on the 25y zero.

Posted: 8/21/2003 12:12:14 PM EDT

[#7]

Thank God this is not about the movie!

Karl

Posted: 8/21/2003 1:08:06 PM EDT

[#8]

Sighting in at 25 yards will put your bullet 6" high at 100 yards - and even more at 200 yards. Basically its a 400+ yard zero.

If you can only zero in at 25 yards - zero so the round is hitting 1.2" below the point of aim.

Or if you have range calibration (e.g. an A2 rear sight, or BDC scope) then zero at 25 yards using the '4' setting.

Posted: 8/21/2003 1:12:16 PM EDT

[#9]

Quoted:
If you shoot at 25 meters, the bullet is just begining it's arc, so it hits the ten ring.
as it passes through 100 and 300 meters it is at the same point in it's arc, and as such is able to hit the same spot.
It's worked for the Marines for years.

View Quote

Sorry Gunslinger but that isn't so - unless your 'bullseye' is 20" across.

USMC zeros at 36 yards which produces a 300M far zero, you're still something like 3-4" high at 100 yards. Certainly accurate enough for a battlesight zero. While if you zero at 25 yards you can easily miss a prone target in the 150-200M range.

Posted: 8/21/2003 1:25:19 PM EDT

[#10]

Quoted:
Sighting in at 25 yards will put your bullet 6" high at 100 yards - and even more at 200 yards. Basically its a 400+ yard zero.

If you can only zero in at 25 yards - zero so the round is hitting 1.2" below the point of aim.

Or if you have range calibration (e.g. an A2 rear sight, or BDC scope) then zero at 25 yards using the '4' setting.

View Quote

Are you sure that 25y will get you 400+?

This is the graph I get with my Remington shoot software:
[img]http://iceknightconsulting.com/traj2.jpg[/img]

Posted: 8/21/2003 4:34:43 PM EDT

[#11]

The Marine Corps uses a 25 meter zero target to achieve a 300 meter Battlesight zero.

Posted: 8/21/2003 6:43:19 PM EDT

[#12]

For the love of GOD!

Please read the Maryland AR15 page linked above and use the Improved Battlesight Zero. You'll be MUCH happier, and your rifle will be much more useful.

-Troy

Posted: 8/21/2003 6:45:09 PM EDT

[#13]

Okay, I'm totally confused now. The graph that Vector has makes since. I can go to a friends house to get 100 but he works at P.D. and I'll have to do it when he's off.

I do thank all for the help though.

[ARCHIVED THREAD] - Sighting in Scope and Heat questions

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