Archie,
Your numbers are a little off...
My copy of Cartridges of the World, 8th edition, on page 271 has the following infomation about the original Schmidt Rubin,
"The first Swiss 7.5mm cartridge was adopted in 1889 for the Schmidt-Rubin... The original loading used a .329-inch diameter, 213-gr. paper-patched lead bullet and a charge of 29 grains of semi-smokeless powder..."
The correlation between jacketed bullets and smokeless powder was not, by any means, definite or unbroken.
Remember, smokeless powder suitable for use in rifles was only a few years old -- the French developed the first truly smokeless powder suitable for rifle use in the early 1880s, which led to the adoption of the 8mm Lebel round in 1886.
The original loading, according to COTW, for the 8mm Lebel, as Balle M, a jacketed 232-gr. flatnosed, flat base bullet.
The flat nose was adopted because the 1886 Lebel rifle fed from a tubular magazine that ran under the barrel.
The British used a compressed pellet of back powder in the .303 until about 1890-91 because of developmental problems with their version of smokeless powder -- Cordite.
The British weren't the only ones forced to do this, either. In 1885 the Portugese adopted the 8x60R Guedes round, which also had a jacketed bullet but black powder propellant.
There is also some evidence that at least some of the early developmental work on the cartridge that became the .30-40 Krag was also done with shells loaded with black powder simply because of problems developing a suitable smokeless powder.
In my collection I also have an 11.15x57 Spanish "Reformado" cartridge that has a jacketed bullet and a blackpowder charge.