Hi Bill, VERY interesting and unusual pistol, I congratulate you for this acquisition! It seems you have been busy making a very good collection of antique firearms. This thread is giving very good information and analysis on the subject of the straight rifled barrels. 
 
Fernando, I donīt think bullet rotation helps in giving less air resistance, as the friction is incremented. Neverthless, it gives a more flat trayectory, more penetration and less dispersion. Not needed by the use assigned to Billīs gun, I think. I mean, not to shoot at short distance. This kind of rifling poses some interesting questions. 
My best regards 
 
Gonzalo
		 
		
		
		
		
		
		
		
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