Looking for an extra long 50(preferrabley) cal rifled flintlock barrel in shootable condition for a Scottish style rifle build. I know rifled barrels aren’t period correct but I’d like to pair my Scottish Fowler with something I can stretch more accurately. The largest I could find without needing to actually talk to someone would be a 48” from rice but I’d prefer longer. Know there’s not much practical reason after a certain point but I’m asking anyway. Thanks!