Anyone load those flat base grand slam 143's for the 7mm WSM? I loaded some up with that MAGPRO poweder. It was specifically designed for the short magnums like SAUM's WSM's and the like. The data from Mestern powder says that with a 140 grain bullet and 73 grains of powderit should be movin a little over 3200 FPS. I am thinkin it might be only movin like 3175 to 3200. Just wondered if anyone had any experiences.
As well, does anyone here use grand slam bullets and how do they hold together at 50 to 100 yard shots? EJ