I just checked the MBW boolits; they are .430 (according to the box), which is what they recommended to try first in my Ruger. The FA throats may be .429, but the xtp's are .430 and they shoot great. I'll experiment more after season closes.

I've been thinking about putting one more iron in the fire and taking up casting; you know, I don't have enough hobbies now. If I do, that'll be a good time to experiment. If I do decide to, I'll be worrying the crap out of you veteran casters.