Argh...the forum monster wouldn't let me post a reply this morning. Anyhoo, here it is now.
Originally Posted by JLA
Actually the 6.5 creedmoor is a necked down .30TC to be exact
(runs and hides
Yeah... .30T/C, .308Win...6.5Creedmoor, .260Remington. there are so many new cartridges out these days that pretty much duplicate each other that I tend to lump em all together. I haven't quite figured out the .30 T/C or it's siblings since the .308 will already chamber nicely in a short action. Is there a new ultra-short action length that some of these new "stubbies" are gonna be paired to?
Originally Posted by guns4life
have looked at the 6.5 creedmore but no experience with this cartridge some one please educate me as to the differences in it and the 6.5x55 I already have a kimber sporterized carl gustaf but would like a more modern rifle thanks in advance
The 6.5Creedmoor is a fairly newcomer that was developed specifically as a target cartridge. It's got a short case to cycle through a short action rifle even when loaded with a nice long high-sectional-density match bullet,fairly straight case walls and a steep 30° shoulder angle.
Here's a really good article on it that covers it pretty well.
Personally, I love the .264 bore diameter bullets regardless of the case that they're stuffed into....my opinion is that it's about the perfect bore size for any North American game except the really big critters. In either 120gr or 140gr, the sectional density numbers are very high...meaning that given their diameter they'll carry their energy out farther than a comparable weight in a larger bore diameter.
As for why choose the 6.5Creedmoor, or the .260Remington (a .308-length 6.5mm cartridge), or the good old 6.5x55? That's all up to personal choice. I think all three are about equal performance-wise on game or bulleyes.
The advantage of either the .260 or the Creedmoor is that they will chamber in a short action rifle while the Swede is stuck with a long-action due to the overall cartridge length. Performance is pretty much identical between all three...give or take a few fps.
Since you've already got a Kimber Gustaf in 6.5x55 I would say stick with that cartridge. It'll eliminate the need for another set of reloading dies...or ammo if you're not a reloader.
All depends on what you find that tickles your fancy...