Whilst I size pellets for a .25 Webley Patriot running at close to 37 fpe this may be pertinent for sub 12 fpe as well as skirt sizing MAY send you over the 12 fpe limit. I nose and skirt size every pellet for three reasons. 1. None are thrown away as they all end up uniform. I choose skirt size for accuracy. 3. I skirt size to optimize power. I can nose and skirt size around 12-15 per minute in a die that I can increase skirt size and nose size to bore size (not groove size). Increasing skirt diameter may allow the compression pressure to further rise and send you over the limit. Of course this does not worry me.
Cheers