Smallest centerfire rifle would be a Sako Varmiter in .222 Rem.
Largest centerfire rifle is a Ruger #1 in .375 H&H.
Largest bore would be a Shiloh Sharps in 45 2 4/10 (45-90).
The rifle collection is a little sparse, but I range between a Mannlicher-Schoenauer Model 1903 in 6.5x54 and an 1889 Trapdoor Springfield in -- no surprise -- .45-70.
One of these days I'd like to get a Model 70 in .458 or a .460 Weatherby. Why? Because the teenager that fell in love with the idea of those guns in the late 1950s is still alive inside me.
I've only got 3 center-fire rifles
a 223 is the smallest and the biggest would be either the 270win or the 9mm hi-point, depending on how you measure. Actually, now that I think of it, the 9mm could be both the smallest and the largest.
My break action 50cal 209 muzzle loader (CVA Wolf) is so close to a center-fire rifle, maybe that should count as the biggest
Smallest .223, largest .45-70. I just realized that every centerfire rifle caliber I have is a military caliber. .223, 30 Carbine, 7.62X39, .308, .30'06, and .45-70. Hmmmm, I wonder what Freud would say about that.
smallest is 223 mini 14 with ati stock.
largest is tied: marlin 336 in 356 and remington 721 in 300 h & h
recently sold sako in 375 h & h. no more elephants in S.C.( I hope)