I thought I would post a photo of my .257 calibre Condor....

It uses a TJ's barrel inside a 23mm carbon fiber sleeve, one of Doug Noble's valves and hammer springs, and a 250 bar (3625 psi) bottle.... It runs about 170-190 FPE depending on slug weight.... Here is what it does with the 93 gr. "Noble" cast slug from Arsenal Molds....

Here is the .257 barrel, compared to the stock .25 cal barrel....

Bob

It uses a TJ's barrel inside a 23mm carbon fiber sleeve, one of Doug Noble's valves and hammer springs, and a 250 bar (3625 psi) bottle.... It runs about 170-190 FPE depending on slug weight.... Here is what it does with the 93 gr. "Noble" cast slug from Arsenal Molds....

Here is the .257 barrel, compared to the stock .25 cal barrel....

Bob