I helped design the steel shot special when I worked for Jaegers.The chokes are slightly longer than the standard guns.We found that the longer chokes patterned steel shot more evenly.All of the testing was done with 3" 15/8 oz.steel #2 shot.One key thing we found out was that up to .020" constriction there was little or no stress on the barrel.There was enough compression in the load to pass through the choke without damage to the barrel. As you pass .020"constriction the chance of damage to the barrel increases exponentially.Also,the patterns get ragged after .020".
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