When I see groups like that, my first question is "Are you shooting off a Harris bipod and a $15 lumpy rear bag?" It is almost pointless to expect "flyerless" groups with that kind of set-up, though I know a very few marksmen who can do it (albeit with custom barrel and stock).
Second question is
"Are you shooting a factory barrel?" For reasons that cannot always be explained (perhaps lack of stress relief), I commonly see these kind of groups with factory barrels. Often, with a bedding job and a custom Krieger, Brux, Bartein etc. you will see a significant improvement in both average group size and consistency.
If, however, the OP is shooting from a crappy front/rear support set-up on a wobbly wooden bench, this is to be expected.
OP Quote:
"Caldwell tack driver up front....cheap little walmart one under butt stock...on a cable spool". That Caldwell is a big X-type sandbag, but overall, yes, this is a crappy support setup.
And if you're shooting that Ruger American Predator, factory stock and factory barrel,
don't waste one more second analyzing your group. It is pointless.
Though I won't rule out "driver error", you honestly can't expect much more than this from a Sub-$400 factory Ruger rifle.
RugerAmerican Predator 6mm Creedmoor $389.99:
https://www.sportsmansoutdoorsuperstore.com/products2.cfm/ID/191746
