did you work that load up, or is it just something you figured to jam together to see if it would work? If you worked it up and you are getting satisfactory results with it, why bother going for the extra 100fps and possibly lose it? If you did not work it up, then I would start at 45gn and work up to 48 by 1/2 gn increments, until I got the group I wanted or pressure signs made it dangerous. I have usually found the groups get best somewhere around the half-way mark, then open up, then close up again as I approach max. Most of my best groups are above max listed loads. BUT I WORK UP TO THOSE!