I'd trust Mark's advice any day. I've yet to read anything but smart, "reasonable man" type responses from him.
I believe you are in fact getting those velocities with your rifle. I am not calling you a liar. I also believe that load is way over pressure and you are fool if you think it is safe unless the load has been pressure tested. According to Hodgden, a standard 25-06 load using IMR4831 and an 87gr bullet gives about 3350fps. Your getting 600fps more. AI'ing a cartridge will not give you that much of a jump in performance without an associated huge jump in pressure.
