NOTE THESE ARE A PRESALE, WITH BARRELS DUE TO SHIP FROM MGM TO HOA BY THE END OF FEBRUARY. MARTY
HausofArms has partnered with MGM (Match Grade Machine) in Utah and has done a special batch of these barrels to fill YOUR needs. These are TC Encore Stainless Steel barrels 20" long heavy These barrels will fit any TC Encore/Prohunter or Endeavor frame as well as fit any factory rifle forend. These are priced much less than MGM's normal price, and with free shipping in the continental US and free use of credit cards through HausofArms.
Dylan at MGM had some velocity testing on these calibers by an independent 3rd party, check out this link it is extremely informative and will answer alot of your questions regarding barrel length and velocity.