My Mistake !...............From the earliest service round to the Mark VI (1889 to 1910) the .303 used round nose or hollow point/soft point rounds. It started out with a round nose, then went hollow point and soft point, back to round nose again. Through it all I believe it was a 215 grain bullet.
The 303 didn't get a spritzer slug (174 grains) until the Mark VII service round was introduced in 1910. It was done after the British faced the Mauser 7MM in the Boer wars and again its opponents thought the 7MM to be superior.