eldeguello

I don' t think so my friend! Roundballs fly fast and minies/maxis/buffalos hit hard, but they don' t go as far & not as accurate in comparison to sabots & rifle-shaped conicals in an in-line. You also can' t pour a gallon of water over the ignition system of a side-hammer like you can with some in-lines. You can' t clean the breechplug or use more consistent 209 primers in 98% of side-hammers either. A big-bore 58 side-hammer can use " magnum" powder loads. A 54 can use semi-magnum loads..... but that' s about it!

I prefer to use my 1-66" roundballer over an in-line.... but my Omega is the only one with accuracy and penetrating power on long open field/ridge 200 yard shots. I believe the GPR has a 54 cal version with a fast twist barrel option. That one may compete more closely with an in-line... but I' m not aware of any other models that are:
Beyond 50 cal/side-hammer/fast twist/magnum capability.