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9/22/2017 12:11:25 AM
Posted: 7/19/2005 8:47:39 AM EDT
A couple of days ago I found a nice piece of BLM land to really stretch the legs of my NDM-86/1P21 combo. I picked out a likely-looking light-colored spot (appx 4' wide & 3' tall) on a hillside and ranged it w/my LRF by walking most of the way out and ranging to both the hillside and back to my car (which is an excellent laser reflector). Range came to be 1,280m from my car to the spot I picked out so I set up 80m closer towards the target to make my range 1,200m.
Now, previous experience w/the 1P21 & Georgia Arms 168gr match sighted in at 500m showed a need to hold low at longer ranges due to the trajectory difference between the 1P21's 7.62x54 BDC & .308 168gr match ammo. I guesstimated I'd need to back off appx 50m to hit dead-on with the extreme range chevron's on the 1P21's reticle (meant for 1,000m, 1,100m, 1,200m & 1,300m shooting). So, instead of setting the reticle to 900m/9x I set it to 850m/8.5x and held dead-on.
I hit low, a few feet below my aiming point (?). I reset the reticle to 900m/9x and tried again and hit dead-on at 1,200m! I fired another 8rds and all either hit or missed slightly to the left (very slight breeze but at 1,200m it has lots of time to work on a bullet in flight).
I'm very pleased that the NDM-86/1P21 combo can hit that far out (right at 3/4 of a mile, furthest distance I've ever shot at) but that's pushing the reticle to its limit as at 9x magnification I can barely make out & use the 1,200m chevron, the 1,300m chevron can't be seen at all. At 1,200m I'd say the NDM-86/1P21 combo is definitely a threat but not deadly (further practice/testing at that range may change that impression).
As for why the 1,200m chevron is dead-on when I was expecting it to be off by 50m or so I don't have an exact answer. Perhaps the trajectories re-coincide at 1,200m or perhaps my removing then remounting the 1P21 has thrown my elevation off just a bit (I'll have to re-test the 500m sight-in at the range later this week).
Regardless, I'm very pleased w/the performance of the .308 NDM-86/1P21 combo at all ranges.
Tomac
Link Posted: 7/20/2005 4:08:34 AM EDT
this is a very good range report! Thanks so much! I wish that I had bought NDM-86 from CDNN before they sold out! I just could not put the money together in time.

Yours,
One Rusty Nut.
Link Posted: 7/20/2005 4:36:42 AM EDT

Originally Posted By 1-Rusty-Nut:
this is a very good range report! Thanks so much! I wish that I had bought NDM-86 from CDNN before they sold out! I just could not put the money together in time.

Yours,
One Rusty Nut.



Thx! It's not too late, get your money together and keep checking the EE, Gunbroker & GunsAmerica! You should be able to score one before the prices go out of sight. Good luck!...
Tomac
Link Posted: 7/22/2005 11:36:25 AM EDT
UPDATE: I retested my 500m zero after removing then reattaching the 1P21 and as far as I can tell the zero hasn't shifted at all! The 18" 500m gong was easy and the repetitive and continuous hits (24 total) started to become monotonous! ;)
So, I ran out to the BLM land where I fired another 36rds at my 1,200m target area (which when measured w/the 1P21 rangefinder turns out to be about 1m x .5m in size). This time, however, the wind was gusting continuously from my 7:30 up to appx 10mph. At 1,200m the wind has a lot of time to work on the bullet so while I did get a few hits by using the horizontal windage marks to compensate (not as many as I'd like) most of my shots were off to the right, at times as much as 8m! It was also interesting to note that when the wind was gusting the most the bullet would hit high by about .5m or so, evidently the wind was giving the bullet a little help along the way!
Tomac
Link Posted: 7/29/2005 10:47:34 AM EDT
Say Tomac....do you think this scope would be good for the 6.5mm Grendel?
Link Posted: 7/29/2005 4:47:05 PM EDT

Originally Posted By Taipan:
Say Tomac....do you think this scope would be good for the 6.5mm Grendel?



Unfortunately, no. The BDC is set for the 7.62x54 (think .308 ball) and would probably deviate too far from the 6.5's trajectory to make it practical. Besides, I don't think I'll ever see a 6.5 rifle w/the optics siderail the 1P21 requires...
Tomac
Link Posted: 8/1/2005 9:33:20 PM EDT
this kicks ass.....nothing like dropping rounds in at long range with an SVD.......good shooting! Keep it up and let us know what a five shot group measures out to be when the wind isn't blowing.
Stick a couple windflags up if you get the chance!

Link Posted: 8/2/2005 4:27:15 AM EDT

Originally Posted By Gunwritr:
this kicks ass.....nothing like dropping rounds in at long range with an SVD.......good shooting! Keep it up and let us know what a five shot group measures out to be when the wind isn't blowing.
Stick a couple windflags up if you get the chance!



Thx! I don't think I'll see impressive groups at 1,200m since the bullets will go subsonic (bullets will probably tumble) and accuracy will degrade but trying for group size at that range is on my "to do" list. I think 900m is probably the furthest I can hope for the best accuracy w/168gr match ammo.
Tomac
Link Posted: 8/2/2005 5:23:32 AM EDT
Link Posted: 8/2/2005 4:08:51 PM EDT

Originally Posted By RS39:
Thanks!
Worries about mismatched trajectories kept me from getting this for my Romak3. Nice to know 'pretty close' still works.
Now I'll have to try the other way with my Hensoldt 4x24, 1,2,3,4,5,600m dial, ARMS adaptor off my FAL, and BP-02 mount bracket.



You're welcome! If your Romak-3 is in 7.62x54 then trajectories should be pretty close, much closer than with the 168gr .308 match ammo I use in my NDM-86's. If you do pick one up then please give us a range report!
Tomac
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