Ken, one problem I foresee is that whoever had it reproofed, or others who have owned it since, may think that having 2 3/4 inch chambers means that it will take any 2 3/4 inch shell and may have put lots of inappropriate shells through it. If you know the history of the gun and can be satified that this has not happened then it would be OK. However, I cannot say anything about further resale value.

Hope that helps.

Regards - Ian Forrester