Ok, that doesn't sound like ideal shooting conditions to me, and it explains the stringing. I also think that parallax is compounding those problems.
Move your target back to 200 (if you have the space) and see how that works out for you. Most scopes are set to be parallax free after 100 yards, but like anything else that number includes a margin of error.
Get a more stable shooting platform (improve that rear bag) and try again at a longer distance.
Jimro
__________________
Machine guns are awesome until you have to carry one.
|