An old member on here "Ditz" shot a 10MM open 20 for years, as the smaller guns just didn't fit his hands. We shot together until he moved, he is still a very high "B" shooter (sandbagger!) and on many occasions has beaten A, M & GM shooters. Like I said, sandbagger, like most guys in "B" in any division !
Load development & practice is the key. And if you decide to shoot s GSSF match, EVERYBODY pays attention when you're shooting a 10MM. It's like showing up at the local cruise night with a Ferrari or a real Cobra.
NRA Endowment Member, NRA Certified Instructor for Rifle & Pistol, Illinois State Rifle Assn. - Life Member, GSSF Life Member,N.R.O.I. level I, IL Glockers #34
G: 19,20(x2),21,22,23(x2),24,27,29,34,35 & 36 (still counting)