I am trying to sight in a Winchester M70 in 30-06 at 100 yards and I use Caldwell rifle rest sandbag to stabilize the rifle.
I use Remington Core Lokt in 150 and 180 gr for this rifle. What I found out was, I had trouble to shoot a nice group constantly.

I started with 180gr and after initial sight in steps, I was able to group the shots at 100 yards. I got two shots touching each other, but the third shot was somewhere 1-inch northeast. This pattern continued when I switch to 150 grain since many folks told me it would be easier for my shoulder. What's interesting was, I need to adjust the windage when switching to 150 gr, I would have never thought that's the case, maybe the drag? Anyway, I have the same trouble to shoot a nice 3-shot group or 5-shot group. It's always the first two shots were fantastic.

I think I have the windage correctly, the bullet always go higher after two shots...

What are your thoughts?

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Last edited by iviax; 07/29/18.