Loading for a 35 whelen in a 750 Remington carbineand loading 200 grain Hornady round nose with 57 grains of RL15, the data said with 60 grains its around 2675 which is with a 24 inch barrel. Somewhere along the way from 60 grains with24 inch barreland my the 18 inch carbine the extrapowder will muzzle flash and no velocity. Anybody broke out the chrno and andgot an estimate where that long vs short barrel place is?