M1 Garand Range problem??

[Twinson]

I took my M1 out to the 200yard range today to test fire before perry. I was shooting HXP 70 ammo. The barrel is a VAR and all parts are USGI. When I started shooting, my POI would change. I shot 4 shots and they grouped @ 5 o'clock justout side the black, the next 4 shots grouped @ 1 o'clock just outside the black. I was using a leather sling and I was wondering if I could have been bending the barrel with pressure on the stock from the sling?

Stock has tight lock up with trigger group.
Rear HG has free space between the receiver.
Gas Cylinder is not touching the front hand guard ferrule.
Op Rod passes the tilt test.
Rear sight was tight and I could not push down the apature with my hand.
Receiver is a NEW HRA (very little use)
VAR barrel is indexed perfectly using the alignment fixture.




Any thoughts, I was chasing the bullets on this one all session. Just when I thought that I had a zero, my POI would change again.. Also when I gave 2 clicks of elevation my next POI was 8" higher? Something seemed really goofey.

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[KarlKW]

Did you happen to check to see if your gas plug screw was tight? If this is loose, the whole gas cylinder can move, and accordingly, your front sight. While you're at that end of the rifle, check the front sight screw. Also, you may want to check your op rod piston, it might be at the edge or out of spec, thus leaking too much gas and effecting the op rod action. HTH, KarlKW