Hi Calvin,
Bores are different sizes so "785" doesn't really mean much.
Choke is the performance of pattern measured as percentage of shot within a given diameter circle at a stated distance. To obtain different chokes muzzles have constriction relative to the bore. If the muzzle of your 10 gauge is .785" what does the bore measure 3" to 4 " from the muzzle. If you could determine the constriction of the barrel(s) then we could tell you what choke performance you may expect.
As I'm sure you know that performance will be affected by a modern shot cup, hardness of shot, amount of shot, and even size of shot. The best method of determining choke is to shoot several rounds (5-10) at a 30" circle at 40 yards. I believe 70% is a full choke pattern.
I hope this helps,
Mark
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