Try this:
(1) Form a group " (State Name)Muzzle Loading shooters." Avoid usings terms like guns, firearms, hunters.
(2) Recruit someone to put their name at the top. Local law school profs are best, and there are a few around. Avoid persons associated with retailers, suppliers, or manufacturers of anything related to fireams.
(3) Build a website, mention it at every sporting goods store, big box retailer, shooting range, and gun club. Compile a list of visitors.
(4) With this visitor list, contact the elected officials where many of them reside, remind them of these voting constituants, offer to help them in their re-election campaign (which start about 2 months after they are elected), for their sponsorship/authorship of your desired legislation. This is where a law prof is helpful as you will need to write this.
(5) Get women involved
(6) Contact members of the committee reviewing this legislation, gently remind them how their support can help their re-election, and how their opposition or indifference can hurt them.
(7) Be prepared to have some folks, especially women, testify before a committee hearing the proposed legislation. Get persons in suits or sport shirts. No camo vests or bushy beards: nothing against these persons but they are a TV turn-off.
(8) Meet with legislators: you've got cash and many persons willing to knock on doors, make telephone calls, distribute campaign literature, and place lawn signs, in return for their suppor to your cause.
(9) Never forget that money conquers all, and reason and logic are of no importance to our government.