I'm a firm believer in this philosophy. There are two Puma mares legs in 44-40 in the gun safe. I also have a stainless steel Rossi R92 in 44-40 as well to augment the two Pumas.
On a slight twist to this philosophy and in accord with the above paragraph, I'm a firm believer in having pistol caliber carbines to match/pair up with pistols and revolvers.
And, I believe if you like a certain brand of ammo, stock up on it. Same for reloading. If you like a certain combo of case, primer, powder, and bullet, stock up on those components.
Anyone gone so far as to find and marry a set of identical twins that meets their fancy?
Woody