DD,

In reading about the Q, there doesn't seem to be many rules, smokeless, BP, and duplex is allowed, as for rifles I am not sure.

Try going here and scrolling down and there are results   
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Then you can ask on that site and some would know.
Or
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Or
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Hope these can help, or maybe somebody that visits here will chime in.

Douglas,

I will come, that's a certainty - but when, I don't know yet...  Probably not in winter, seems MT can be rather cold and snowy in that period of the year.
FWIW, I'm looking into going to the Lodi, Wisconsin match in Sept, but not sure I can make it though (less than 50%) - and it sure wouldn't help me in getting to Montana, at 2500 km away!
Anyway, I'll have also to give you some time to get settled...