I bought a book the other day called "Idaho's Greatest Elk" by Ryan Hatfield. I thoroughly enjoyed the book and highly recommend it. It's a collection of stories from each of the entries into Boone and Crockett that came from Idaho: 18 non-typical and 74 typical entries. Most of the entries had years of harvest listed and many had a weapon used as part of the story. Plenty of entries had little or no story that the author could track down.
Here are a couple of sets of info that I collected from that listing.
Decade of Harvest:
10's: 1
20's: 1
30's: 0
40's: 1
50's: 14
60's: 27
70's: 15
80's: 9
90's: 16
00's: 9
Caliber Used:
.30-06: 21
Bow:12
.270: 7
.308: 5
7mm: 5
.30-40 Krag: 3
.300 Win: 2
.338: 2
.32: 2
6mm: 2
.264 Win: 2
.300 Weath.: 1
.25-06: 1
.30-30: 1
Muzzleloader: 1
.300 Savage: 1
.284 Win: 1
.30 Rem: 1