My feeling is that sporting rifles in general are not appreciating as collectibles as rapidly as some other classes of arms (milsurps in particular) at the present time. I hope that stays the case awhile longer, as I'm still hunting for a good deal on a nice 1903 Mannlicher–Schönauer carbine.
Nonetheless, my own 1920s vintage Savage 99 in .303 Savage has probably tripled in value over the past decade. I bought it pretty cheaply though.
(BTW, I just took it out of the safe for a look, thought it seemed a tad forlorn without a Marbles tang sight and ordered one from Midway.)
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David Royal's book does not have a table showing production by _both_ year and chambering. Is this the book you were referencing?
The best information I can find in it is textual (p.31):
"The rifles were only available in .303 Savage in 1899; .30-30 Winchester was added in 1900 and .25-35, .32-40 and .38-55 were added in 1903. ... Production in calibers 25-35, 32-40 and .38-55 was fairly low and they were dropped in 1917 ...they bring a premium price in today's market."
There are year-serial number-quantity tables on pp.134-5 of Royal's book, but as to actual numbers for each chambering [shoulders shrug]. Maybe you can email David Royal directly about this:
[email protected]
For those who haven't got a copy of Royal's guide, it is still in print and reasonably priced as these titles go:
https://schifferbooks.com/products/cgsavage-99-rifle?_pos=2&_sid=a81706573&_ss=r