First things first, what's your typical shooting setup? You mention a bag, but is it a front or rear bag? Is it on a rest or just a loose bag? Picture so we know what you're working with?
Second, if the above is a front bag, is the rear of the stock resting on the bench or is there a bag under it or are you supporting it off the bench and against your shoulder?
Regarding your reloads, that's just something you're going to have to experiment with and figure out what your gun likes. There's far too many variables involved for anyone to say it's one thing or another that's causing your problem. Could be seating depth/jump to lands, could be your powder choice, could be a case neck/bullet runout issue, etc. My advice would be to go back to a known good factory load that your rifle shot good to work on your form and get used to the new stock, then once you're comfortable you can revisit reloading and focus on working up a load since you'll know what the gun and you are capable of.
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