Yep; it is a significant increase in power. I'm from Pennsylvania and we have a flintlock only season after Christmas that lasts 3 weeks; so naturally I own flinters. The only way for me to get the power that the inliners get with a flinter is to use Swiss powder coupled with a Green Mountain 1/28 twist barrel. The Null-B is a super fast and hot ignition powder for the pan. Longer barrels will burn more black powder effectively. Now if I could just find a 36" fast twist barrel I would be happy. My 28" works just fine but adding another 110 fps. would be great too.