I guess a release aid wouldn't be out of the question but, for me kind of defeats the purpose.

If your fingers get bother you after a dozen shots, shoot 8 of 10 and take a break. Better still try some roving (stump shooting) practice instead of hammering a target butt. I think that is a better all around practice, for hunting, and gives your fingers a little longer break between shots.

Long story short - sore fingers, at first, are just part of the game. Like breaking in a new pair of boots, if you don't wear them , they don't get broken in. Get some good tabs and gloves and see which you like best (you can get several for the same price as a good release aid.