i shoot 4's myself, my gun will put 15 pellets in the hesd and neck at 50 yards. judging by what you said about 12 pellets in the head and neck with 4's a 40 yards compared with 6 and 1 pellets from the other 2 subordernates. it's a no brainer i would definately stay with the 4's. you may want to get you a 2 piece tru glow sight put on your gun. it will keep you from shooting over your target just a thought.