rest is a great piece of advice at that range from mastevt. if there is no rest use a sapling or branch by wrapping your pinkie and other fingers slightly around it and extend your thumb as far out as possible. i rest the gun right in the crotch. some guns are to thick to do this andsome are perfect size. 150 yards is a doable shot but it is pushing the ballistics i feel of a slug gun. my bullets travel at 1800 fps out the end of the barrel. it's zeroed for 100 yards, at 150 it drops 7". thats quite a bit. who knows were the bullet is at 160 or 175. a deer is what 1 1/2-2 feet deep (bottom stomach to topback). not saying you can't make the shot or shouldn't have taken it but just try to think were that bullet will be at that range. good luck and i hope you kill a slob