Not legal to hunt turkey here with rifles, but I would guess aim center of mass and use the .270. Your chances of missing are less and your hole won't be as big. You might want to check with one of your local gun shops they could probably give you a better idea. If it is enough gun for it you might want to look into a .22 rimfire. the guns and ammo are inexpensive, you would just have to keep your shots within 50 yards.