i have the same gun and shoot winchester platinum series 2 3/4 slugs. i have open sites and wouldnt be afraid to shoot a deer at 100 to 125yrds. as long as it is standing still. shoot great with those slugs but they are a little expensive. killed 2 doe last year one at 30 yrs running broad side and the other at 85 to 90 yrds standing looking at me. hit her right in the chest where i aimed the gun. she droped liek a rock.