Recently moved to Massachusetts, so I can't hunt deer with a rifle. Thinking of buying an Ultra Slug Hunter. I haven't shot in years. I developed a little bit of a flinch, but I want to practice a lot to get over it. Thinking the 20 gauge makes more sense than the 12 with regards to recoil. Will the 20 be sufficient to kill whitetails out to about 125 yards, if needed? I test fired (snap cap) a USH the other day, and the trigger pull was VERY heavy. Any way to remedy this? Thanks for all your help.