If memory serves the 88 came in .243, .284, .308, & .358. Had Winchester built a .35 caliber rifle on the .284 case for the 88 it would have been a powerhouse. I recall an article I read years ago in which a Savage 99 was chambered for a .375-284 wildcat, a cartridge which I believe potentially produced the most power available from the 99 or 88 rifles.