I have both an 88 and a 99
88 is a post 64 that I had rebored into a 338-08 or now a days it's called a 338 Federal.
The 99R is a 358 and is the first year they offered that caliber.
The 88 is as accurate as any bolt action rifle I own, but has a terrible trigger, not bad once you get us to it.
The 99 is fairly accurate also, but nothing like the 88.
The 88 has a nicer feel and fit, slimmer and easier to shoot.
The 99 is more like a 2x4 in looks and fit.
I would not trade away either.
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"The older I get, the better I was"