Old Hornady manual almost got me in trouble

[BobinIL]

Started loading some 155 Hornady XTP with AA#7 I have an old hornady manual and it has a max load of 13.9 grns of AA#7 :wow: After reading on here and looking at the Accurate manual, I decided to rethink using this old hornady manual. I had some loaded to 13.5 and promptly pulled them and reloaded them with 12.5 grns.

[Minnow]

Latest Hornady book, 8th Edition

10MM Auto
155gr Hornady XTP
AA#7
Maximum Load = 12.7gr
Cartridge Overall Length = 1.260"
1250 Feet Per Second from Hornady's 5" Colt Delta Elite test barrel.

[Jitterbug]

It's always a good idea to get two or more reliable sources of published data, I prefer three, and try and make some common sense of what your reading.

It's been rumored the older Hornady manuals had some error regarding AA7 and 10mm. Typo's and mistakes made by mere mortals are common.

Hornady 4th 13.9 grains
Hornady 7th 15.1 grains

Accurate Arms 3.5 Edition, 12.7 grains for a 155 gr. HP @ 37,500 psi

Lyman 49th, 155 gr. Silvertip, 12.8 grains @ 29,800 CUP

No doubt that 15.1 grain load is a bit warm. BE CAREFUL AND DO YOUR OWN DUE DILIGENCE WHEN RELOADING ANYTHING!

ALWAYS START WITH A MINIMUM LOAD AND WORKUP