I think this is probably what you have:
http://www.hornady.com/store/Lock-N-...nserts-1-Each/
14 insert Bullet Comparator kit
Quote:
Bullet insert number and corresponding bullet caliber:
1-17 | .172" bullets
2-22 | .224" bullets
3-24 | .244" bullets
4-25 | .257" bullets
5-26 | .264"(6.5mm) bullets
6-27 | .277"(6.8mm) bullets
7-28 | .284"(7mm) bullets
8-30 | .308" bullets
9-33 | .338" bullets
10-35 | .358" bullets
11-37 | .375" bullets
12-45 | .458" bullets
13-41 | .416" bullets
14-20 | .204" bullets
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