Getting ready to start this build in a week or so. Have yet to buy the .257 barrel and new breech yet.
Do have a new TalonTunes SHO valve headed this way combined with the new 580cc CF tank to mount it in.
Right now the Talon has my 24″.25 slug barrel mounted with a regulated 480cc CF bottle. Just ordered up some NSA 55g slugs to mess around with. Also have a NOE .257 mould coming that supposedly will drop 72/75g slugs. Will be giving them a try.