Malamute
40 Cal
Another barrel that fits your stock is a possibility if a complete gun is out of the budget.
I understand the desire for efficiency, but if you look at it strictly in terms of the actual difference between the 50 cal ball and a smaller one, there isnt much real difference in cost or lead used over a year of squirrel hunting.
I shot a few squirrels with a 50 prb with 70 grs powder, it worked very well, doesnt tear them up, just a large clean hole. The question if if its safe in your area is one you will have to answer.
I understand the desire for efficiency, but if you look at it strictly in terms of the actual difference between the 50 cal ball and a smaller one, there isnt much real difference in cost or lead used over a year of squirrel hunting.
I shot a few squirrels with a 50 prb with 70 grs powder, it worked very well, doesnt tear them up, just a large clean hole. The question if if its safe in your area is one you will have to answer.