police here don't GAFF about cap & ball pistols. oddly though, if it is a C&B rifle, the cap/primer must be removed in a vehicle going to or from hunting, or between spots. game and fish guys get upset over shit like that... seems like something is lost in translation.I believe trusts may be the answer to your second scenario.
Re. the 1st, some states have restricted cap & ball revolvers in the past. I think Ma may have been one. Perhaps Ca. too.