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when I take one of my muskets to the nzda range for practice I only ever get around 3 shots myself as I have every man and his dog asking for shots people are just attracted to the very large boom...

I prefer black powder its easier to clean than nitro dirtier use but fouling cleans out really easy with just warm soapy water as solvent
and a good oil such as balistol to preserve the firearm for...

brass life awesome with bp though aslong as you look after your brass

Exactly what is the gun 45-70 is a very early caliber 45-70 = 45cal-70grains black powder
And there are still some very old rifles about that if you tried modern ammunition it would be disastrous ...