It was 4:55 am, I got 5 hours of sleep and was typing quick while heading offshore tuna fishing so perhaps "better" was not the best word to use.I didn't say the first 2 cartridges were better, only that they weren't improved upon.
Basic reading comprehension brother..
Your wording was "basically zero improvement over the .260 Rem", if that's the case then why didn't it take off like the Creedmoor did despite the 10 year head start? Remington dropped the ball by sticking with a 9 twist and hunting focused so Hornady picked it up and ran with it as a faster twist target cartridge.
For the 6.5-284 it was predated by the .256 Newton, the 6.5-06, the .264 Win Mag and the 6.5 Remington Magnum all launching 140gr bullets around 3000 fps. However outside of handloaders and custom rifles the 6.5-284 never really had wide spread acceptance. There was also the 6.5 SAUM and the 6.5 WSM which were more recent and had every opportunity to beat the 6.5 PRC yet Remington nor Winchester offered them leaving the door wide open for the 6.5 PRC.
The parts about Hornady "Instead of tweaking existing cartridges" & "they simply made their own" are absolutely false and hilarious at the same time, If anyone worth their salt knew anything about "existing cartridges" they would never make such a bold, ignorant claim.... and I mean that as in straight up front, hard facts & not a rib
ALL of Hornady's "modern marvels" are versions of existing cartridges and one in particular, is a pirated version of a 20 year old propriety cartridge, minor tweaking of case dims & viola .... Hornady cartridges all suffer from "pre-existing conditions" truth .....
Manufactures using other cartridges, changing some dimensions and calling it their own is nothing new and there are a laundry list of cartridges that were created as wildcats before being adopted by a major manufacturer decades later. Remington alone did the .22-250, 6mm, 25-06, 260, 7mm-08, 280, among a number of others I can't think of at this moment and am too tired to look up. Go back even farther to the beginning of cartridge ammunition and you have companies like Winchester, Remington and Sharps offering the exact same cartridge with their name on it and a slightly different black powder designation despite being identical cases.
For "make their own" I was referring to Saami approval and wide spread acceptance of a cartridge they submitted, when it comes to modern cartridge designs very little is actually new. As for tweaking existing cartridges I meant offering an already existing cartridge loaded to the same specs as the ones they introduced I.e. reviving the 6.5 Remington Magnum or .30 Newton with long heavy bullets in a fast twist barrel instead of creating the 6.5 PRC or .300 PRC.
The performance of the 6.5 Creedmoor, 6.5 PRC and .300 PRC can all be duplicated by a number of cartridges that have existed for decades if not over a century. The 6.5x55 Swede has been shooting 140gr bullets at 2700 fps since 1894, the .256 Newton was shooting 140gr bullets at 3000 fps since 1913 and had the .30 Newton had the powder available today and a fast twist barrel I'm sure it would have been able to match the .300 PRC since they have almost the same capacity. Heck I was duplicating the .300 PRC with my .300 Win Mag years before it was introduced.
If Remington hadn't dropped the ball on the .260 and the 6.5 SAUM and Nosler had actually improved the .30 Nosler by offering it factory standard with a 3.6" COAL and faster twist instead of just being a beltless win mag the 6.5 Creedmoor, 6.5 PRC and .300 PRC wouldn't exist today. They didn't, Hornady did and now their options are more popular and seem to be holding that way for the foreseeable future.