If you want to try something to sort out your front bag issue (if that is what it is), get a pair of old jeans and cut off about 18" of the lower leg portion, twist wire around one end to seal it, fill about 80% full with regular sand, then wire tie the other end. lay your new "bag" down and tamp it with something heavy and flat to get your fore-end to lay flat and level on it. Use your squeeze bag on the rear. The fore-end is very well supported and any inconsistencies you have in your squeeze-bag technique will be somewhat minimized. For something that cost almost nothing and looks butt-ugly - it will provide you a quick way to isolate "bag problems" versus load problems. I shoot "semi free-recoil" testing loads, with only my thumb resting atop the stock (no pressure), finger on the trigger and the buttstock almost touching my shoulder (as close as it can get without introducing possible influences on the stock). No cheek weld or other influences on the stock. This will show you more of what you load is doing - and less of how much your technique is influencing that group.
I agree with what others said about switching up your load a bit. I'd first try seating your bullets about .005" beyond contact with the lands. If you are using bushings in your sizer, use only light neck tension (about .002" smaller bushing than loaded round, as measured at the end of the neck). The reason for this is to also mitigate some runout that may be influencing accuracy (though runout alone will not usually enlarge groups that much). I'd start there as that costs nothing other than the cost of a few fired components. If you still have groups like you do, I'd stop right there and change powders or try a few other bullets. Groups of that size , more often than not, are not cured with primer changes or tweaking the powder level - or even further fiddling with seating depth. There are exceptions to everything in this game - but more often than not... Most rifles have an affinity for a certain powder - and it can sometimes not be the standard "go to" for that caliber as used by most competitors. If you have buddies from whom you can get a small sample of powders you would like to try, that can be very worthwhile. My network of friends is always swapping powder, bullets, primers, etc.. Varget, Reloader 15, etc. come to mind... Another bullet choice might be the Lapua 105 Scenar "L" bullet. Jam it. If you jam all loads, you only need about 16 rounds-worth of each powder to see if there are possibilities, shooting 4-shot groups.
Then there is the question as to whether you ever shot "really good" groups with that scope or, for that matter, with that rifle. If you have, the odds are your bedding, scope, scope mounts, etc. may not be an issue - unless the rifle was knocked over on the rest, etc. Getting groups like that is fairly common when using a powder your rifle is not loving with that particular bullet. If equipment and technique is satisfactory, you will likely be changing one of the two. Good luck!
