Hi Hunter2 & 320pf...
Regrettably there is no info listed on the manuals I already have.
320pf, thanks to your postings on here and on "reloadersnest" I have been fortunate enough to start my work-up loads. Thanks!
I have a copy on pdf of the Sierra Manual...cannot attach as it is TOO big for the forum's capacity but it does have sub-sonic info listed.
I am just rounding out gathering whatever data there is on my new favorite cartridge. I spent another day in the desert getting about 400 rounds downrange...I could not be HAPPIER with the results!
I took a bunch of my loads to chrony and dial in at 100yards and am refining them as we speak.
320pf, you can e-mail me directly with the Hornady info (and the AA data, as well)...like I said I'm just gathering info.
I have a file on my pc just for .300 Whisper-related info...it's my "go-to" file in case I have a brainfart and need to see it in writing.
Besides I am also developing supersonic loads...want to whack a coyote and possibly take game with my .300Wh.
My e-mail addy is:
giovanni_c4@yahoo.com
Many Thanks & Take Good Care
G