I have to agree with CK. You have a relatively light rifle firing a .30-caliber round with a fair amount of recoil off a wobbly front rest and you are not squared behind the rifle so I'm betting the rifle hops laterally on recoil.
It does look like your adjustable comb (cheek rest) is too high, but only you can determine that. When seated behind the bench, is your back fairly straight, or are you leaning way forward? The more you lean forward, the more muscle tension is likely to affect you on recoil.... plus, leaning way forward will tend to push your face a bit more toward the scope than a more upright seating position.
MAIN POINT here: Put your rifle in firing position on the bench, sit down behind it, close your eyes, and drop comfortably into your cheek weld. Open your eyes. Are you centered in the eye box? If you have to rotate your head back to get into the eye box, the comb is too high.
I bought one of those Caldwell rests early in my rifle journey circa summer 2017. It has not seen daylight since fall 2017. As CK said, if the bench sucks such that you can't properly deploy a bipod on it, get the f*** off that bench. Go prone or bring your own folding bench. Or bring a piece of plywood or MDF and clamp it to the bench to extend the bench to a usable extent.
And get over that fudd mount position. You want your body square behind the rifle. I know precisely ONE shooter with both experience and
skill who uses that old mount style.
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Bottom line is, trying to fix your accuracy issues via your reloads appears to be like switching tires trying to fix alignment issues, and you're getting tire advice from a pimply 19-year-old at Pep Boys (reloading "lore").
If you are not aware, SH has a series of online training modules that were VERY helpful to me as a newbie. Here's an old post of mine with
steps to access it.
Good luck.
