I know in 9mm and .40S&W velocity drops something like 50-70 fps per inch of barrel loss. What is the average loss for .45ACP? Since most ammo testing is speced with 5" barrels I'm a little concerned about ammo performance out of a 3" barrel. That's a lot of velocity loss. Would it be better to use 200gr bullets instead of 230gs so you don't lose too much speed? Anyone have links to testing of Gold Dots, HSTs, etc, out of 3" barrels? Want to see how expansion and penetration compare to the 5" tests.