Can I use Winchester hulls marked "Squirrel and Rabbit" with loads listed for AA hulls?

I wouldn't suggest it. All hulls have different internal volume limits, the base wad inside the hull determines this volume.

Call the folks at Ballistic Products and describe your hulls to them, they should be able to help you identify them. They might also have some load recipes that are suited for them. It might well be that these hulls weren't even intended to be reloadable.

763-494-9237 is the number for BP.

Hope this helps.

In my experience the hulls you refer to are weaker than AA and tend to collapse when loading. I have found them to be more trouble than they are worth.