[dr. mabuse]

I'm new to this type of rifle set-up and observed something strange today.

Put together a Bushmaster lower w/~3# trigger, A3 upper with 24" bull barrel, 1/8 twist, floated fore-end, Harris bipod and Leupold Mark IV on top.

I shot small 3 shot groups and reloaded after each group but each group was floating around within a ~ 3 1/2" diameter.

I folded up the bipod and shot off a ruck and then got consistent 1/2" or less groups without the groups wandering around.

Used the bipod and the problem returned.

I don't have to use the bipod but is there a way to cure this with a bipod attached?

Never saw this before with a bolt gun or a shorter AR.

Thanks