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Posted: 1/19/2006 5:11:27 AM EDT
[Last Edit: 1/19/2006 5:15:32 AM EDT by wessono]
How do you sight in your weapons for this ammunition? I have been using the Santose Improved Battle Sight Zero for years now with 55 grain ammunition ( 0 at 50 yards) and it's proved very useful out to 250 yards. I now am contemplating switching to the BH 68 gr OTM load and was wondering if the Santose zero would still be an effective sighting technique. BTW I've looked at the info on the fragmentation charts tacked here and run some numbers on two different ballistics software and got three different results, some of it not even close to each other. Just wondering what you've found out while shooting this ammo.
Link Posted: 1/19/2006 5:37:04 PM EDT
Tag, cause I'm curious too. I don't think it will matter too much, but there may well be a difference.


-K
Link Posted: 1/19/2006 5:50:13 PM EDT

Originally Posted By Special-K:
Tag, cause I'm curious too. I don't think it will matter too much, but there may well be a difference.


-K



My guess is there's not too much difference. But wessono seems to know more about it than I do. I haven't even shot any of those more than 100 yards yet. But I think I may soon.
Link Posted: 1/19/2006 6:22:45 PM EDT
[Last Edit: 1/19/2006 6:25:01 PM EDT by cycobushmaster]
The same IBZ method will still apply. Here is some data for a H 68 OTM with a muzzle velocity of 2720 fps (16" bbl). This is just representative data, as it was pretty cold when I was chronying:

Yards Bullet Path

50 .0
100 +1.0
150 +.6
200 -1.5
250 -5.3
300 -11.2

0-200 yds the IBZ should work fine if you don't like moving the elevation wheel on your sights.

ETA: sorry about the spacing. Don't know how to fix it. You get the idea.
Link Posted: 1/19/2006 7:14:58 PM EDT
[Last Edit: 1/19/2006 7:15:15 PM EDT by Bushwacker85]
I sight it in @ 100 yards.
Link Posted: 1/19/2006 7:16:44 PM EDT

Originally Posted By Bushwacker85:
I sight it in @ 100 yards.



Why? Just curious.
Link Posted: 1/19/2006 7:21:19 PM EDT
I had an interesting experience with this just 4 days ago.

100yd zero with Q3131.
16" bbl 1 in 9 twist rate.

I bought some 68grn OTM to see what it would do. I was a little supprised to find I had about a 12" POI shift upward. I about expected some rise from what the ammo oracle said but not this much. I'll have to try it again to verify it was not shooter induced.

Link Posted: 1/19/2006 7:32:52 PM EDT

Originally Posted By Stove_Pipe:

Originally Posted By Bushwacker85:
I sight it in @ 100 yards.



Why? Just curious.



Well, I use it mainly in my long range AR. I mostly shoot paper with the gun and on the 100 yard range, so it made sense to sight it in at 100 yards.
Link Posted: 1/20/2006 10:10:22 AM EDT

Originally Posted By soowah:
I had an interesting experience with this just 4 days ago.

100yd zero with Q3131.
16" bbl 1 in 9 twist rate.

I bought some 68grn OTM to see what it would do. I was a little supprised to find I had about a 12" POI shift upward. I about expected some rise from what the ammo oracle said but not this much. I'll have to try it again to verify it was not shooter induced.




I'd be interested in hearing about the next time you do this. 12" is ALOT!
Link Posted: 1/20/2006 11:00:44 AM EDT
The IBZ will still apply, putting you pretty close, POA-POI, out to 250 or so.

Do not expect to use the same zero as 55gr ammo, as they will probably be close at 50, but the difference at further distances could be significant. If possible, confirm your zero at 200 or 250 yards.

Link Posted: 1/27/2006 6:25:51 PM EDT
One BTT to see if anyone has any more info.
Thanks for the replys.
Link Posted: 1/27/2006 7:10:06 PM EDT

Originally Posted By wessono:

Originally Posted By soowah:
I had an interesting experience with this just 4 days ago.

100yd zero with Q3131.
16" bbl 1 in 9 twist rate.

I bought some 68grn OTM to see what it would do. I was a little supprised to find I had about a 12" POI shift upward. I about expected some rise from what the ammo oracle said but not this much. I'll have to try it again to verify it was not shooter induced.




I'd be interested in hearing about the next time you do this. 12" is ALOT!



Interest too..

I shot some Fed Gold Medal 69gr SMK the other day and got a nice 2-5/8" group 6 inches low at 200yds out of my 16".
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