Mikeness,
You seem like a nice chap. I don't need internal/external ballistics explained to me, but if the others want it feel free to do so, it's your thread.
I'm all ears as to how the 6.5 Creedmoor is the best thing to come along in ages with the 6.5mm. It looks like a 22-250 case necked up and blown out. It's been done before and I'm sure I could find a pic of it in P.O. Ackley's book. It looks like a fine cartridge that would fill the mid range niche perfectly and cycle for repeaters. For short and long range there are better choices. I've heard Hornady Creedmoor brass is soft and the future of any chambering is it's availability of brass and ammo.
Mr. Tubbs is a famous shooter and he could beat anyone with a standard .308 Win with his tube guns or an M14 in Camp Perry. The man is pure shooting talent.
I don't know what experience you have with long range shooting, but I know what works to 1000yds and what cases I've tried. I also know what others have tried. I fully understand case design and have had reamers designed around them just to experiment. I was playing with the .260 before Remington came out with it and have always appreciated the 6.5x55 case in standard or Ackley. When shooting 140gr VLD's, there is a velocity node that does it right at about 2,950fps. The 6.5x55 Ackley and 6.5x284 case make it happen easily without high pressures. It's what I see in the winners circle in 1000yds matches and the 6.5mm bullet with F-Class.
The 6mm, 7mm and 30 Cal. are another story.
I won't argue that the 6.5x55 is king. My most accurate factory hunting rifle is a Rem 700 Classic in it.
I really like the 6.5 Grendal too. The only reason I favour the 6.5x47L is because of the great brass. I hear some guys are using that brass and fireforming it in a 6.5 Creedmoor chamber. I'm still skeptical as to whether the small primer in that case/bore is optimal. I'm still getting reports of delayed ignition. Small primers and powder choices are critical for best performance. The fact that the Creedmoor uses a large primer is a plus to me.
When I start seeing the 6.5x47L do well at the matches, I'll take a closer look at it. At present, the 6BR rules up to 600 meters and nothing has knocked it out yet.
Yes, very short necks, but I guess it's better than no brass. Better off reforming 260 brass, but there's the effort involved.6.5x47L is way too short to make creedmore brass. Even the 22-250 will end up short, not that is really matters.
Yes, very short necks, but I guess it's better than no brass. Better off reforming 260 brass, but there's the effort involved.
That's my real feeling about the Creedmoor. If brass disappears so does the interest.
Spent alot of time mucking with 6.5's in F Open and as lejarretnoir has suggested, the goal is 2900'ish fps with a 139/140/142 something or other. There are only a few cases that do this with all the other parameters we want.
6.5 Swede, 260improved/6.5 Mystic, 6.5x284 (although the case volume is far more then necessary). Any case larger is highly ineffecient and way too hard on bores (6.5x284 is bad enough). There is the next higher node which cases like the 6.5-06 can reach but are just too errosive to keep on a steady basis.
The rest go slower. There is no case that is more accurate then any other - we know how to make all of these shoot. So it boils down to displacement, bullets desired to be shot and how fast you want/need to move it.
Where the 6.5 Creedmore DOES have a nice set up is for US High power shooting from BOLT ACTION RIFLES using very short 308 mags (ie M1A and AR10 type mags). If someone eventually develops something for the longer AI/ AA mags, then this might become moot.
Not saying the 260Rem can't work cause it can. But that is "old" news and doesn't have that ###y improved shape. By the way, location of bullet base/boatail relative to the neck/shoulder junction has little to do with accuracy.
The Creedmore has gained support in the AR platform despite a case shape that work as negatives. Sharp shoulders and cases with low body taper are NOT desired in semi autos. I suspect that clean match rifles and properly set up mags resolve potential issues but there are issues never the less.
So this is really a narrow niche player... alot like the 6BR and 6.5 Grendel/LBC. Make a dandy hunting rifle as I am sure that is where the bulk of recent sales have gone. Not a bad thing at all but no 1 size fits all solution.
The US is finally waking up to the benefits of the 6.5 cal which we can be polite and offer as 50yrs late (it is far longer then that). The consumer mood is into smaller "more effecient" packages since magnumitis seems to have left the building.
All manner of cutesie cases like the 300 blackout (old news by the way), 6.5 Grendel/LBC, even the grand daddy 7TCU are getting press.
Not a bad thing at all and I wish Hrn plenty of sales....
Jerry
PS if you really want to see an explosion of small and superbly "efficient" accurate cartridges, look up Elgin Gates, Donaldson, Gibbs and others from the 60's, 70's and 80's. Handgun silhouette gave birth to many of these little gems so in vogue today. Like alot of modern music, remix an old idea, stir it up with some flash and jiggle, call it new and make some money.
I've shot both and wore out a few barrels with them. I find the 6.5x55 Ackley more flexible and easier to tune. You can drive it faster if need be for heavier bullets. It's a longer cartridge so small loading ports won't eject loaded rounds. With the .260 Ackley and 140grs bullets I had to use "N" series Vihtavouri powders to get velocities in the mid 2,900fps without driving the pressures to high on hot days. Both cases shoot well, but I prefer the 6.5x55 Ackley for 1000yds. It depends on what type of shooting you want to do with it. If you want it for tactical repeater use I'd go for the .260 Ackley. Lots of guys love that combo and I think North Shore Barrels has a gun for sale setup like that....not sure whether to go 260AI or 6.5x55AI... Is there any advantage of one over the other?...
I've shot both and wore out a few barrels with them. I find the 6.5x55 Ackley more flexible and easier to tune. You can drive it faster if need be for heavier bullets. It's a longer cartridge so small loading ports won't eject loaded rounds. With the .260 Ackley and 140grs bullets I had to use "N" series Vihtavouri powders to get velocities in the mid 2,900fps without driving the pressures to high on hot days. Both cases shoot well, but I prefer the 6.5x55 Ackley for 1000yds. It depends on what type of shooting you want to do with it. If you want it for tactical repeater use I'd go for the .260 Ackley. Lots of guys love that combo and I think North Shore Barrels has a gun for sale setup like that.
I'm kind of glad this topic popped up. Glad because there seems to be quite a few knowledgable 6.5 guys here. I'm considering a 6.5 build on a Savage target action(I already have it) and not sure whether to go 260AI or 6.5x55AI... Is there any advantage of one over the other?
I know I would have to fireform, not concerned about that. And Lapua makes brass for both. I'm kinda partial to the 6.5x55 but would love to hear what you guys have to say.
Also, sorry to hijack, but it seemed like everything that needed to be said had been said.
You should really consider the 6.5 BR case then if this is your goal. Tons of Lapua 6BR brass which IMO is the best Ive seen if you want more consistency. I plan on building one in the future. I remember another gunsmith who built a benchrest gun in it and it shot in the .1's. Getting good custom bullets in 6.5mm is the key for even better consistency....But remember all the velocity in the world does not replace consistency!! I would rather a .2 group as a constant than 3000 fps and a .5 group once in awhile and replace my barrel or set it back every 1500 rounds or less!! remember shoot more shoot better!
You should really consider the 6.5 BR case then if this is your goal. Tons of Lapua 6BR brass which IMO is the best Ive seen if you want more consistency. I plan on building one in the future. I remember another gunsmith who built a benchrest gun in it and it shot in the .1's. Getting good custom bullets in 6.5mm is the key for even better consistency.
The 6.5x55 Ackley and 6.5x284 were designed for hart hitting long range and minimal recoil in F-Class. Accuracy is there and I can't ask for more.
YMMV
6.5x47L is way too short to make creedmore brass. Even the 22-250 will end up short, not that is really matters.
Jerry
Very well. What case works?Many facts make consistency,shooter,trigger,kick,,action,barrel,load ,bullet and many more I see your in love with the ackley and a fine round it is.I consider and have shot many 6.5 s here and Europe and am very familiar with most all of them. I also know which cases i can reform and which i cant and I see there is a little lack of info on your side as one cannot reform 6.5x47 lapua to a creedmoor.