Crossman are cheap pellets> i am supprised their is that small a weight diference you want accurcey buy olpimic grade pellets and test all sizes and weights to see what your gun likes??? What kind of gun are you shooting the pellets in?? It may be beyond your guns capability to shoot any better?? When you get into an olpimic grade air gun and are talking thousands of dollars for a gun> you get what you pay for>>> an $800.00 dollar match gun is going to shoot better than a $300.oo dollar air gun>>> a $7000.00 airgun is going to have one hole cpabilitys<<<