Bill, I can't tell you much about LeFever guns, all I can tell you is he should have been put in jail for stealing it. Questions 1-4 I can't help you with, but I believe it is a high grade gun.
10 ga. at that period would have had 2 7/8" chambers. If the previous owner said he shot 3 1/2" out of it I would definitly have it looked at very carefully. If found shootable only use low pressure loads under 8,000 psi (in my opinion)
Chokes I believe would be lt.mod/mod as 10 ga bore was +/-.775.
Good luck and keep us informed for results for gunsmith.
I'll give him double what he paid.
Last edited by JDW; 03/08/08 11:23 AM.