What grain slugs are you getting 270fpe?I have the Rattler .357 with 700cc tank, and I run reg at 180 bar ( what I consider to be max power), 270FPE, and I get 15 shots.
I think what's happening with the .457 is having that super long barrel is allowing for less reg pressure to achieve that power, thus giving you the potential full mag of shots.
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