I have a Ultra Compact V10 (loaded). with about 250 rounds through it the only malfunctions (failure to extract) were with Wolf ammo. This, in my opinon, is because the powder they use dosen't burn clean. Remington Golden Saber and Remington ball ammo, both 230 grain, work fine. With the V10; it is stated in the owners manual not to use frangable, shotshell or +P ammo, also no +P in any of there compact/ultra compacts. No problem with accuracy, don't think I would go shorter than a 3.5 inch barrel (my preference) may not get hollow points to expand properly. This is something that would need to be tested and I have not done this with a 3 inch barrel,may work just fine.