Given the pressure limits of the 71 action and the 35 caliber bore, I doubt you would see much velocity difference. It's not a 257 Weatherby. P.O. Ackley may have claimed 2500 fps with a 250, but he's been gone for more than 30 years. I doubt he often used a chronograph, much less pressure testing gear. Start low and don't be surprised if you get pressure signs long before 2500 fps.
Last edited by natman; 03/01/20.
