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Posted: 10/3/2004 1:47:48 PM EST
Im gonna buy an ior m2 tactical scope for my 6.8 spc. Which should i get it calebrated for, the 308 or the 223. Thanks
Link Posted: 10/3/2004 1:49:37 PM EST
The 115gr OTM follows the trajectory of 168gr match .308, until the first noticeable difference: at 600m the 6,8 is 4 inches low. Is this (168gr) the load the M2 is calibrated for?
Link Posted: 10/3/2004 3:03:25 PM EST
Im not sure I just assume that it is in the general range of each caliber. I have read that the 6.8 follows closely the trajectory of the 62 gr. 223 round, I think.
Link Posted: 10/3/2004 3:31:20 PM EST
6.8 is almost identical in trajectory to 168gr .308 and 77gr 5.56.
Link Posted: 10/3/2004 3:43:34 PM EST
so what should i get the scope calibrated in?
Link Posted: 10/3/2004 5:20:11 PM EST
I think .308 will be a lot closer. IIRC the 5.56 scope is calibrated for M855, which is very dissimilar to 6.8 in trajectory.
Link Posted: 10/6/2004 7:55:49 PM EST
6.8 Trajectory = .308 Trajectory + or - about and inch out to 600 yards when comparing the 115 gr 6.8 and ball .308.

Get a .308 scope for a 6.8 rig

6.5 vs 6.8 vs .223 vs 308 info
Link Posted: 10/6/2004 8:24:54 PM EST

Originally Posted By Smithy:
Im not sure I just assume that it is in the general range of each caliber. I have read that the 6.8 follows closely the trajectory of the 62 gr. 223 round, I think.


No, this is wrong. The question is answered in the 6.8SPC FAQ thread.
Link Posted: 10/7/2004 2:47:42 PM EST
Not your question, but I have a IOR M2 for 5.56, and these are OUTSTANDING scopes--perfect for the AR-15.

I admit, I had not even considered this scope, overlooking it in catalogs. But when I had the chance to actually handle an AR-15 equipped with one, I was convinced. I like the rangefinding scale, easy to use. And when the owner explained the zeroing, use of the BDC, lit reticle, etc, I was sold.

The rubber eyepiece looks funny, but works great.

Any of you that have not looked at the IOR M2 before, do so.
Link Posted: 10/19/2004 3:37:52 PM EST
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