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azredhawk44
March 9, 2006, 04:31 PM
Springfield Armory M1A 18" Scout
Standard Aperture Sights
(applied some BrightSights paint to the front post for contrast)
100 yards

Ammo:
South African MilSurp FMJ
Winchester Silvertip Softpoint 150gr Factory
Federal American Eagle 150gr FMJ Factory
Homeload (Remington 150gr SP, H335 - 42.3gr, WLR, Winchester Case, 2.790 OAL)

Here's the targets. One more coming in the next post, since 3 is the max.

azredhawk44
March 9, 2006, 04:35 PM
So, the Federal FMJ seems no better than the Mil Surp, except for being boxer primed. Left and right variation, as well as vertical.

The winchester was very consistent. I was surprised. But it shoots low compared to most other ammo I have shot from this rifle.

My load with the Remington 150gr SP's was 1/2 above the 0-line and 1/2 below it, but in general everything seems to center about 2" to the left.

How much should I move the front post to the left to correct this? I don't want to use the windage adjustments to correct for sight alignment.

And finally, how is this so far?

GUNSMOKE45441
March 9, 2006, 05:16 PM
How much should I move the front post to the left to correct this? I don't want to use the windage adjustments to correct for sight alignment.

Why??? that's what it's for.

azredhawk44
March 13, 2006, 12:05 PM
Why??? that's what it's for.

Because I want to have it sighted in correctly at 100 yards with whatever turns out to be my favorite ammunition.

I shouldn't ever have any ammunition that noticeably shoots off center in a rifled weapon. Vertical variation is tolerable since propellants and projectiles can and will vary.

For example, if I'm going hunting with my M1A and 175gr bullets, I know to click the sights down a couple notches. If I have a sidewind that I have calculated its effect on my bullet at a 200 yard shot, I use the windage adjustment.

If I am at a competition with 168gr match bullets, they will shoot differently than the 175gr hunting bullets. I move the vertical sights accordingly. But I don't ever want to have to worry if that windage adjustment on my rear sight is "true zero" or if it is some adjustment left over from last shooting session.

If I zero on the zero lines, I can see at a glance that my rifle is zeroed in and not adjusted for any situation that is no longer applicable. I want windage to be 'zero' when it needs to be zero.

I was told by somebody that each hash mark on the back of the receiver is 4MOA, so I will move the front sight to the left about 1/2 of one of those marks.