I used 75 grain Black Hills last season. It dropped a 280 pound buck at about 80 yards on the spot with a neck shot. Lung shot on a large doe at about 30 yards left her on her feet for about 60 yards before she tipped over.

I know plenty of others who use, and have been using for decades, 55 grain and up in both .223 and .222, and all will tell you the same thing: if you hit the deer where you're supposed to, you'll kill it. If you're confident in your accuracy with the Sierra, I would recommend using it. Your goal is to poke a hole in the right place, no matter what caliber, and placement is always going to be more important than bullet size or shape. The only "drawback" I note is that you're not making a fist sized hole in the deer, so sometimes you're not going to get a very strong blood trail. Depending on your hunting area and your tracking abilities, you might want to take that into account.

I'll be switching to 69 grain this season for no other reason than that's what I could get at a reasonable price.

Any 223 round is going to be enough for a coyote, but I have no experience with hogs. From what I've heard, though, you might want a larger caliber for those.