Defender,
I once read or heard that many states allow silencers, I was floored when I heard this, but it may be true, if so, that may be case solved with any cartridge...
just did a quick google search for ya...
http://www.impactguns.com/store/silencers.html
Sound Suppressors and Silencers ALL NFA (National Firearms Act 1934) RULES APPLY!!!
To the best of our knowledge, silencers are legal for private ownership in the following states: AL, AR, AK, AZ, CO, CT, FL, GA, ID, IN, KY, LA, ME, MD, MS, MT, NE, NV, NH, NM, NC, ND, OH, OK, OR, PA, SC, SD, TN, TX, UT, VA, WA, WV, WI, and WY. Additionally, they maybe owned by Class 3 dealers and Class 2 manufacturers (but not individuals) in: CA, IA, KS, MA, MO, and MI. Territorial law prohibits possession in the Territories and Possessions of the United States. There are no known restrictions on governmental ownership. If your state is not listed, check with your local office of the Bureau of Alcohol, Tobacco, & Firearms or your state's Attorney General. If they are not legal in your state of residence, we cannot sell to you. Please do not ask us to violate state or federal law.