Re: Magpul MBUS sites at 200 yards.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Monmouth</div><div class="ubbcode-body">After reading and the replies to my post, I may have to swap out my rear sight.
Sterling, could you please explain why I shouldn't use a 6 Oclock hold for my type of shooting. Should I keep my current "center mass hit"?
Lastly, I just ordered a scope (swfa ss10x42 with the Burris QD mount) to learn iron work as well as magnification work.
Happy Holidays.</div></div>
Right now, entertaining a 6 o'clock hold will require some effort, since an adjustment of the front sight, for every newly presented target height and/or distance, will be required for a center hit. This is impractical. Plus, your front sight has a very course adjustment value, about 1 3/4 minutes per click, this makes getting to center at any distance for any target height somewhat difficult.
Your BUIS is most versatile on your sort of rifle when adjusted for a BSZ set at 300 meters. With such zero, using a center of mass hold, the bullet path and line of sight will intersect at 25 and 300 meters. The maximum ordinate will be 7 to 10 inches high at 150 meters. At 350 meter you'll be 10 inches low, and, at 400 meters, about 20 inches low. With this in mind, you can see, when shooting at an "E" size target, which is compatible with your rifle/sights, you can get good hits out to 400 meters, or thereabouts, with a center of mass hold. Changing the rear sight for a Matech you can also adjust for KD target engagements to 600 meters, as well as make on the fly adjustment from a 300 meter zero to a 200 meter zero. Making this adjustment reduces the maximum ordinate to not much more than an inch at 100 meters.
Here's what I would do, drop your 10 inch plates and shoot at "E" type targets, or, if marksmanship with irons is what you are attempting to develop, shoot the MR-31 at 100 yard distance with your sight adjusted for center hit from a 6 o'clock hold. This sort of practice will build motor and picture memory, and progress can be noted, since the MR-31 is a scorable target. Also, since a 300 meter zero will place your bullets about 3 to 4 inches high at 100 yards, you may be able to retain your 300 meter zero when shooting the MR-31 target which is about 6.2 inches in diameter.
One more thing, remember, with irons you are using picture memory to get good hits, while with a scope you are using resolution for good hits. Do not expect resolution from irons, you must have a target which you can see well enough to understand when the sight picture is what you want. This does not mean you can't shoot some little biddy groups, but it does mean you need something bigger to aim at than what would be required when shooting with a magnified optic. On the other hand, while some scopes can discern a golf ball at 600 meters that in and of itself does not assure a hit, since the target is only about a 1/4 minute at such distance, and very few shooters have the skill and equipment to hit such a target no matter the scope power when there's just a hint of wind.
BTW, most of my shooting today is at 1000 yards with a match conditioned commercial equivalent of the M16A2 Service Rifle. This rifle has "as issued" iron sights but with 1/4 minute value for both elevation and windage from rear sight. My average score is 186 so I'm putting most of my shots inside 20 inches of the 44 inch bullseye. I could clean such a target using a match aperture sight on a rifle shooting a higher BC bullet; but, nevertheless, I find it's remarkable what is possible with a post front sight just centered in the rear aperture and placed constantly on target through development of picture memory.