Re: 7mm STW accubond issue??
If your getting 2" exit holes, I think the bullet is performing fine. Lung shot deer can run 100 - 150 yards when their lungs have been destroyed. If you want them to drop on the spot, move the bullet forward into the front shoulders. You'll ruin a lot of front shoulder meat, but the deer will likely drop at the shot. I've seen bullets fail to expand on three separate large game animals, and the bullet exit hole was essentially the same diameter as the bullet entrance hole. Sometimes non-expanded bullets will tumble, but if these three tumbled, they happened to exit either point or butt forward. Because the exit holes were no larger in diameter than the entrance holes thru the hides.
I prefer to shoot thru the ribs/broadside, to avoid the meat damage associated with placing the bullet into the front shoulder meat. It doesn't concern me if they run 100yds before they drop.
I shot a black bear once, positioned broadside. The bullet struck low on the rib cage, just behind the front legs. Was shooting a .338 Win Mag, 250 grain Nosler Partition from a distance of about 90yds. The bear jumped and quivered at the shot and then took off like a quarter horse. Ran about 125yds and piled up. I heard him collapse but couldn't see him the last half of his death sprint. When I field dressed this mid-sized black bear, I found no trace of the heart remaining inside of the chest cavity. And I split the sternum completely apart investigating the heart lung cavity forward of the diaphragm. There was a significant exit hole coming out the far side of the ribs. The heart was gone, evidently sucked on out the far side of the rib cage along with the bullet. So this bear ran 125yds without any heart to pump blood/oxygen to its brain or muscles. Very little bullet damaged meat.