IIRC the C in Savage 99C was for clip

Model 99-C Clip Magazine Rifle

Recent production model in .22-250, .243, .284 Win., 7mm-08 or .308-caliber. Barrel 22" and open sights. Blued, with walnut stock. Features clip magazine, first modification to Model 99 in 66 years. Introduced in 1965. Dropped from production and reintroduced in 1995 in .243 and .308-calibers. Weight about 7.75 lbs. NOTE: Add 50 percent for .22-250, .284 and 7mm-08.