Could be "Pistol-Packin' Mama". I can only remember the refrain, which goes:
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Lay that pistol down, boy,
lay that pistol down.
Lay that pistol down.
Ambassador Charlie Ray is a "biggie" in country music and lives in Nashville. He suggests you call or write:
Ernest Tubb Records
Nashville, TN 37203-3963
Sheet music has been out of print for generations; you'll have to buy the record and memorize it. Ernest Tubb's will either have it or they'll find it for you.