[Stinky Coyote]

prompted a google

stole this from outdoor life article...but the creedmoor was released by hornady 2007

"The 6.5 Creedmoor was different, however. Neither of these scenarios applied. Instead, it was born out of a gripe session between one frustrated shooter and his friend. The shooter was Dennis DeMille, a legend in the world of High Power Rifle competition. The friend was Dave Emary, senior ballistician at Hornady Manufacturing. The date was August 2005, and the location was the National Matches at Camp Perry, Ohio."

this i found on wikipedia which i thought was fantastic news but double the likelyhood of hits at 1000m over the .308 win and comparable to 300 win mag instead is pretty significant

Military use[edit]
In October 2017, U.S. Special Operations Command tested the performance of 7.62 NATO, .260 Remington, and 6.5 Creedmoor cartridges out of SR-25, M110A1, and Mk 20 sniper rifles. SOCOM determined that 6.5 Creedmoor performed the best, doubling hit probability at 1,000 meters, increasing effective range by nearly half, reducing wind drift by a third and having less recoil than 7.62 NATO rounds. Because the two rounds have similar dimensions, the same magazines can be used and a rifle can be converted with a barrel change. This led to its adoption and fielding by special operations snipers to replace the 7.62 NATO cartridge in their semi-automatic sniper rifles, planned in early 2019. In response to SOCOM's adoption, the Department of Homeland Security also decided to adopt the round.[24][25]

since prc came up it's a hornady thing as well

the grendel was Bill Alexander of Alexander Arms, but hornady was the first to really get behind it, so yes, hornady is definitely on the ball and instrumental in getting the 6.5 revolution going but really its more the saami spec high bc, fast twist, fit in standard length magazines/actions movement that they are really getting going....don't have to do custom everything anymore

more wikipedia on grendel, it was first really, ar15 platform driven/military replacement driven to improve .223 performance

"January 2004: Alexander Arms officially introduces their new cartridge, dubbed the 6.5mm Grendel, at the SHOT Show. They introduce both a line of rifles and ammunition.

Nov 2009: Hornady teams with Alexander Arms to produce 6.5mm Grendel ammunition, cartridge cases, and dedicated projectiles. They introduce a 123 grain AMAX load, which quickly gains a reputation for excellent accuracy."

so hornady is covering the bases...ar10 and short action platform, ar15 platform (only a few mini bolt actions to take advantage of this round so far) and now the prc for the hunters who want more than what short action standard cartridges can deliver...well played hornady!

6.5 Grendel 2004
6.5 Creedmoor 2007
6.5 PRC 2018 (hornady 2018 new products launch)

PRC in development since 2013, i think the grendel was in development since about 2002-2003 and not sure how long the creedmoor was before it's release?