Oh my goodness,somebody finally showed up with some modern day basic ballistic knowledge and common sense!!Good to have you aboard RA!!!!Of course a 10 will shoot faster particiularly heavier loads!Red Allison is right on the money a bigger shell means more room for ignition and accleration thus faster loads!The real ? is,is it neccessary??I've carried a 10 in the turkey woods for the last 20 years and personally wouldn't leave home without it!And no it is not neccassary!!!