I have both a 6.5cm and a 6.5prc. the 6.5cm is 24" barrel and shoots hornady factory 140gr ammo at 2688fps (i think this is a little slow as barrel isn't broken in yet) 6.5prc 147 factory horandy ammo is 2942 (barrel also is brand new with less than 50 rounds down it) Unless you can get a 6.5cm to shoot a 147gr bullet at 2900fps then the PRC is much faster then 50 fps over 6.5cm. Also note that in my test the 6.5prc is shooting 147gr bullets, not 140. I have found not only to be accurate but with Horandy factory ammo i'm getting and SD of 15. Pretty good in my book.