7.62x51 or .308 to be more specific. Requesting some input: Was thinking about the 50yd IBSZ (POA/POI at 50y). This will be for the folding BUIS, using M80 Ball or equivalent. Okay or any better suggestions?
7.62x51 or .308 to be more specific. Requesting some input: Was thinking about the 50yd IBSZ (POA/POI at 50y). This will be for the folding BUIS, using M80 Ball or equivalent. Okay or any better suggestions?
Last edited by ABNAK; 05-17-20 at 18:33.
11C2P '83-'87
Airborne Infantry
F**k China!
I feel like in the short range; 556 and 308 are very similar. So my suggestions would be either the 50/200 or the 36/300. I have always felt a longer zero is better for iron sights because they don't have the aiming point of a dot or reticle. Maybe even the 25/400 would be good for irons?
Tactical Nylon Micro Brewery
What projectile at what velocity for shooting at what target in what conditions?
Without further info, I always default to 100yd zero for everything 5.56x45/7.62x51
There are certainly reasons to deviate but in a vacuum (and my personal situation), that is what I do and recommend.
M80 out of an 18" tube is going to be around 2600-2700 ft/s, so let's go with 2650 MV.
You put this into the "Beyond 5.56" rather than the "Other Guns", so I'll assume an AR-based rifle with standard height irons sights, for a 2.6" LOS over bore.
2" high at 100 yards (basically a 200 meter zero) will give you a max height of 2.25" at 130 yards, POA/POI at about 190-235 (+/1.2") and about 7" low at 300 yards.
In meters, that's a max height of 2.25" at 120m, POA/POI at 175-215m, and 10" low at 300m.
Thanks Jack! It is a DD5V4, so yeah, an AR platform. "Neck hold" at 300m should make it just about a COM shot with that data.
Given that these are standard AR BUIS and aren't quickly adjustable for elevation like an M-14 or an M16A2, I need to pick one "zero" of sorts so it seems like the 200m zero might be the best overall option.
Primary optic will be a TA-31 ACSS ACOG that can also be used with 7.62NATO (1" high at 100 yards for M80-type ammo or 168gr then the BDC should be close).
Last edited by ABNAK; 05-18-20 at 17:57.
11C2P '83-'87
Airborne Infantry
F**k China!
I do 50/200 or good old 100 yard zero. I always felt if I resorted to my offsets, it would be CQB and it wouldn’t much matter.
PB
"Air Force / Policeman / Fireman / Man of God / Friend of mine / R.I.P. Steve Lamy"
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