This doesn't really answer your question as to "When", but I came across an old advertisement for "M Hartley Co., 313 and 315 Broadway, New York, N.Y. Military Arms, Equipments, and Ordnance Stores, 1903-04":
U.S. Springfield Breech Loading Rifles
Military Rifles, 45 cal., brown finish, open Springfield sight, ............$7.50
Military Rifles, 45 cal., brown finish, Buckhorn Wind Gauge sight.....$9.00
Military Rifles, 50 cal., Bright finish angular bayonet.......................$4.50
Military Carbines, 45 cal.,..........................................................$7.50
Remington Rifles
Military Rifles, 43 cal., ...angular bayonet....................................$12.50
Military Rifles, 43 cal.,...Sabre Bayonet.......................................$15.00
Military Rifles, 50 cal.,...angular bayonet.....................................$12.50
The ad also lists the following Breech-loading carbines: Sharps 52 cal linen $2.00, Spencer 52RF $4.00,Burnside $2.50, Maynard $2.00, Remington (N.Y.S. Model)$4.50, and Smith $3.00
"Roberts Transformed Springfield Rifles, 58 cal., Rim Fire $4.00"
Sevearl pages more, including "War Relics of the Span-Am War - 7mm Mausers for $12.00
Wish I had a time machine!