In "Unforgiven," (a Great Movie I might add) the wh*re was cut up in 1880 and the "settling of a score" ensued.

When the posse was forming to chase William Munny (Clint Eastwood) and company, a referance was made to the fact that they couldn't get any more .30-.30 shells on credit.

The .30-.30 (John Browning's last work) was introduced in 1894 and was not available commercialy until 1895.