I'll give a big "Plus 10" to REL1203s comments about the Hogue stock, particularly when fired off a bipod or with a suppressor attached. My 700 AAC SD has many fine features but the "stock" stock is not one of them. Before you spend too much time or components, try this simple test, using old fashioned sand bags, place them directly in front of and underneath the magazine on your rifle. Shoot several groups with known, accurate ammo, FGMM works well, but your dads proven handloads would probably be just as good. Then using the same ammo, but your normal shooting rest, try again. If your results are anything like mine were, you'll be looking for a new stock (if you can afford it), or breaking out the Devcon 10110 if you can't (like me). The good news is that once the forend is stiffened up a bit the rifle will probably begin to behave much better. Mine went from 1 and 3/8ths" to just over .60" at 100 yards off the bipod with a rear bag. My load was 45.8 grains of Varget with CCI BR2 primers in Hirtenberger cases under 168 gr. SMKs. It still won't really behave with the YHM 7.62 suppressor installed, but it's a whole lot better than it was.
Bottom line is that while they are awesome rifles for the price, Remington had to cut costs somewhere to keep them affordable and the stock was the logical place to do it.