The original Winchester factory recommended loads were 748 with the WLR primer (a mag primer for standard ball powder loads), 200 gr bullet 50.6 grs 748 2500 fps, 250 gr bullet 46.2 grs 748 2,250 fps. Winchester loading manual #14.
From a velocity perspective 748 is ideal with 220 gr bullets. TAC and 4895 are going to out perform for velocity with the lighter 180 gr bullets. 748 or 335 is the powder used here with the 180 gr Speer. Did a lot of 748 in 356/358, and like the 335 load, both are loaded down to 2400 fps, due to known to me, bullet integrity issues at close range. 748 had not trouble meeting that velocity, and gave superior accuracy.
All the later 99s from 1953 when adapted to the 243/308/358 feature actions designed to handle the higher pressures of these more modern rounds 60,000 psi or 52,000 cup. While not discussed, the 300 Sav (42,000 cup) can be up loaded a fair amount, in this later action. Different from a BLR, Win 88 there is no primary rotary extraction, which can lead to somewhat sticky extraction when fully loaded, thou the loads themselves are perfectly safe. For this reason, I tend to load my 99s at least 100 fps below a max recommended load.