Oh I should add the E-factor was calculated using the equation in Kick Starter release rules (4th edition ?) and real statistics. The slightly longer round has an E-Factor of 12 (or 12) instead of 11 but can't be used in the pistol. Also the round detailed is the 'common' all user round, not the AP one that was originally intended for law enforcement agencies as part of the design requirements - I've decided to see how it goes for my party before considering whether I need to provide them with both.
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