I think 125 yds is no problem under the conditions you laid out.
However, the limiting factor will be your PH. If he has enough confidence in your shooting abilities, he might let you go a bit further.
I strongly suggest paying rapt attention to everything the PH says. After all, it's his skin if the buffalo patty hits the fan.
BTW, he'll have you shoot a target on arrival in camp, ostensibly to check zero. But what he's really checking is your ability to use the rifle.

Bonne Chance,
SOS