How's This?

[azredhawk44]

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]

Last target, and pic of rifle

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]

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]

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I zero on the zero lines, I can see at a glance that my rifle is zeroed in and not adjusted for any situation that is no longer applicable.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.