Consistency problem stumping me

[longwinters]

Been shooting off the bench for several years now, mostly for testing new loads.  But every once in a while I go thru a period of inconsistency in my shooting form.

I know the rifle should come straight back with a little muzzle jump on firing.  But I go thru streaks where the rifle jumps up and left.  I will typically have 2 shots touching, or almost so, and the 3rd will be off an inch.  I would think it must be a pressure problem concerning contact with something on my shoulder or on the shooting bag.  

My left hand can be over the scope, and this seems to solve the problem, but if I keep it tucked/wrapped under in the standard form I get this weird reaction at times.  Any help out there?

Thanks,

Long

[Don Fischer]

Not sure what the problem is but, you shouldn't hold the rifle down with your hand over the scope. Also, keep the front sling swivel stud off the sand bag. That sling swivel stud will move backward and snag the bag on recoil befor the bullet leaves the barrel. I don't like to touch the rifle at all with my off hand. Instead I hold it under the butt stock and squeeze a sand bag to raise and lower the muzzle.