What Bro. David said
The average bore and choke dimensions (inches) were
Gauge Bore Improved Cylinder Modified Full
12 0.732 0.725 0.710 0.695
16 0.662 0.657 0.639 0.629
20 0.615 0.610 0.595 0.585
Starting in 1907, Hunter Arms catalogs included the following statement:
“All Smith Guns are bored full choke unless otherwise ordered. We bore all our guns according to our Multiplied Choke Bore System, which has made the Smith Gun famous the world over for long-distance, chose-shooting and hard-hitting qualities. We can bore a gun as follows using the twelve-gauge gun as a standard distance, forty yards; circle, thirty-inch; shot, Tatham’s chilled No. 7 1/2, one and one-quarter ounces; American Association Measure, 345 pellets to the ounce or 431 to the load.”
Full choke……………………70 per cent or 301 for pattern.
One-half choke………………60 per cent or 258 for pattern.
One-quarter choke……………50 per cent or 215 for pattern.
Improved cylinder……………45 per cent or 193 for pattern.
True cylinder…………………35 per cent or 150 for pattern.
Last edited by Drew Hause; 09/22/11 08:31 AM.
