I have also read Taylors books, and also another author of the same time (unfortunately I can't get to my library) with what seems like as much experience as Taylor. The general issues Taylor had with the Austrian and particularly German ammunition and bullet structure was reliability. This was just the opposite with most of their comments on British bullets and ammo.
I remember them speaking of overexpansion, jackets fragmenting and the bullet coming apart on thick skin or bone. The Large bore German and Austrian bullets of FMJ structure would bend and deflect rather than penetrating straight. There is a lot of mention of bullet form. Round nose and flat end round nose bullets traveling with the least deflection and the pointier or pointed bullet not holding true.
I guess as today, a good well constructed bullet will give good results and reputation and the poor one will be poor.
But, not having used any vintage ammo on game, can't say for certain.