Originally Posted By HiCap45:
The instructions say: "Set the Rear Sight so that the 300-meter mark is aligned with the mark on the left side of the receiver". OK, I can see the "4" on knob and the "5" and on up the elevation. But I can not see a "300" mark.
Is the "8/3" mark that 300-meter mark that I am to start with?
Yes it is the setting for 300M and 800M (hence the 8/3). It should also be the flat side of the dial.
When zeroing on a 25-meter range, the rear sight elevation knob is adjusted to the 300 meter mark PLUS one "click" up...does that mean one "click" up from the "8/3" mark?
Correct you bottom the dial to 8/3 then go up 1 click. (-2 would be go down 2 clicks).
from a solid rest. At 25 yards my three shot groups (all 3 holes touching BTW...your guns shoot very well) were 3/8" below the dead center of the circle. Thinking that was "good enough"
Should be (if the zero were correct but the 8/3+1 has problems - see my above posting). Hitting 3/8" low at 25 yards is a good approximation of a 25M zero.
I put another target out at 100 yards with a VERY bright 10" circle in the center of a cardboard USPSA target. All shots were going high. I was aiming for the center and hitting high; most 2" above the circle...some 3" above.
If the groups were varying - that is you. But 2-3" high at 100 yards is correct, it will go higher still (further down range). Remember you are launching a ballistic projectile, it will follow a parabolic path. It is not a laser beam.
I then changed my aiming point so I was "balancing the circle on the top of my front sight", shot 10 rounds and all 10 rounds hit well within the circle. Now here is my concern. Did I properly sight in by having the elevation knob on the "8/3" mark?
Well you followed the directions correctly. YOu got lucky in the bullets offset from line of sight just happens to coencide with your targets 'black' diameter.
If it means anything the ammo is Winchester 55 gr. FMJ.
Actually it does mean alot. I going to assume the box is marked 5.56 (i.e. product # Q3131 or Q3131A) not .223. The differnce isn't really noticable at 100 yards or less - but at longer range it will make a difference.
By the way, I will be sending the upper back to you to have your "three and a quarter inch" Y-COMP put on.
I really recommend against this. Most people complain about the back blast of this muzzle brake. If you REALLY must have a muzzle brake contact Kurt of Kurt's Kustom (at the bottom of the Industry Forums). His brake looks very much like the A2 and just combats muzzle rise (not recoil). So there is not 'back blast' just 'upwards blast'.
I will also be getting your 24" V-MATCH complete upper (no front sight) and putting a Leupold on it.
My buddy has one of these - its a very nice rifle - extreamly accurate. I was doing 500M first shot hits on 18"x40" targets.