replied to you pm with more questions for you to answer. but with the hunt so close looks like adjusting scope to the cold bore shot is the best bet.
have fun and if it is the same buffalo hunt my neighbor did last year (and I was supposed to go on this year
) you will have fun.
when you get back PM me and we can take a look at your gun and get the problem fixed ( i my wife is due with our 2nd kid in november, then have december and january deer seasons, but can find some time to look at it during that time frame if I bag my deer early, or can look at it when the seasons are over).