1902 Logan-Gregg Hdw. catalog with J. Stevens Arms & Tool Co. 350 with "Special Steel" and 360 with Twist. Note the Stevens Demi-bloc breech. 250 Hammer gun listings had the same "Choke Bored For Nitro Powder"



Courtesy of Researcher; a catalog page for the 250 with "High Pressure Steel" barrels with same "for nitro powder".

http://www.shotgunworld.com/bbs/viewtopic.php?f=5&t=348248

Of course (sorry) no one on the internet can determine if THIS gun is safe, with ANY load.