Mike et al., I had some time and plugged .835" bore into my choke calculation excel spreadsheet and here are the theoretical constrictions for 8-gauge. As always actual choke efficiency (percentage in 30" dia circle at 40 yards) depends on other factors to include shot sizing, bore "roughness measurement", choke profile and others. Bottom line, there's no substitute for testing on paper.
8-Gauge IC = 13 thou
Mod = 24 thou
I-Mod = 34 thou
Full = 47 thou
X-Full = 52 thou
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