1: I always have that stock clamped REALLY firm in a vice when drilling those holes.
2: I Never pull up on the bit til the bit has stopped. You pull up running :shake: you are asking for a BIG Mess..... :slap: And I walk the bit in a slight circular motion as I go down, so I am sure it will not mind or chip when I come out.
3: I measure my depth I want on the bit & mark it with electrical tape.
4: I use a variable speed drill & I run it slow.
I have never had one jump on me, but am always expecting one to do that. And I always save a bunch of wood for patches, just in case.
One time I had a guy call me 2 yrs after I built him a rifle. He laid the rifle down on the kitchen countertop & went to the bathroom. He didn't know it but the rifle hit a button & turned on the push-button stove. He comes out of the bathroom, smoke alarm is going off, house is full of smoke, 8" of the muzzle has burnt ! I get the rifle, & I had just moved a crate of scraps to the barn to burn. I emptied that crate & there is 8" off the end of the stock I had cut off with His Name on it. I matched the grain, cut a lil vice carving where the glue line is & you cannot see the repair. He was Thrilled......
Keith Lisle