Just went through the same thing. Ended up with the ultra slughunter deluxe 20. Never been happier, can hit my 6 inch steel every time at 225 yards will go farther back next week and see. I shot both 20 and 12 in this gun before I bought. I liked the 20 much better. If your worried about killing power I have dropped pigs at 125 yards with mine no problem. Just my opinion, by what is more comfortable for you.