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Does anyone know of a source for British 303 BLACK POWDER ammunition?

Thanks

Sorry, NO

The .303 British cartridge was first conceived in 1888 and immediately adopted as
the standard service rifle round for the British Empire (later, by the British Commonwealth).

Originally it was loaded with a 215 grains ball and with 70 grains
of black powder, which was extremely compressed within the case.

In the year 1910, the caliber was modified with a 147-grains Spitzer bullet and with a smokeless propellant load.

https://www.all4shooters.com/en/Shooting/ammunition/303-British-hunting-shooting/

I assume that was a slip of the typing finger...SB 174 grain bullet!

You can handload black powder ammo, but it is very difficult to match original velocities; because the original load was heavily compressed in a straight case, then the case was necked to hold the 303 bullet. I don't know of a way to achieve that much compression in an already necked case.
Mike

The following is drawn from Ian Skennerton's The British Service Lee.

Ammunition loaded with 31 grains of Cordite was introduced on
3 November 1891 to replace cartridges loaded with a 71.5 grain
compressed black powder pellet. A Cordite loads for blanks
had been introduced on 7 February 1890.