Which is "best". 6 x 47, 6XC, 6 Creedmore, 6SLR??

[nakneker]

I bought a 6SLC reamer took it and my components to Jon Beanland for a build. After a 10 minute talk I switched to a 6x47, Jon wasnt pushy but when I mentioned all the rumors I had heard about how finicky it was he just smiled and said that wasn't his experience. I built it on a bighorn action and a hawk hill barrel. Long story short it is pure joy and the most accurate rifle I own, if a bullet doesn't touch or land on top of another bullet its operator error, amazing rifle. Necking the brass is simple simple.

That being said and seeing all devotion of the replies on this thread to the 6XC I think I need to try a 6XC sometime. Interesting info. I've read about it and have been tempted before.

 

[Cool Tool]

I like the 6x47 Lapua it works just fine easy to make.

 

[Lowe Left]

I'll throw another one in the mix: 6x47 Dasherized aka 6 Vortex. Based on 6.5x47 Lapua case. Scott Parks with Vortex is the creator of the cartridge. There is a post on it in this forum.

http://forum.accurateshooter.com/threads/6-6-5x47-dasherized-imp.3886446/

This is NOT the 6-6.5x47 Lapua Improved. The concept is to blow the shoulder forward and put a 6 dasher neck/shoulder on the case. During my fire-forming, I did a quick test with 5 fire-formed cases with 42 gr of H4350 and 105 Amax .040 off. Velocity was 3215 with an SD of 4. No pressure signs (bolt lift, ejector swipes, flat primers). (26" Benchmark 7.5 twist). I now have 40+ rounds loaded with 4350 and 115 DTAC (old school) for load development. Range is closed today, Christmas, so I'll try to get out there tomorrow.

I used a false shoulder on the brass for fire forming, worked like a charm.

L -> R: 6 Vortex, 6-6.5x47 Lapua with false shoulder, 6 Dasher

 

[HTSmith]

I have 2 6XC barrels and 2 6SLR barrels for 2 Savage actions. Plus a Pierce/Krieger 6SLR that is likely recently sold. I like them all. I expect to get 2500 rounds out of the 6XCs using 7828ssc powder. But I expect to get more than 3000 rounds out of my 6SLRs using H1000 powder.
I run new 6XC brass thru a 6XC die, then shoot it. I run cheap Winchester 243 brass thru a 6XC die screwed out .122" for the 6SLRs. The Winchester brass costs less than half that of the Norma brass.
I like both cartridges. Both are very accurate. Velocities are very similar.
By the way, the Pierce/Krieger 6SLR won every mid range match at the South Zanesville (Ohio) range last year.

Hope I'm not off topic too far here, but how do primer pockets hold up on 6XC vs. 6SLR? Thanks

 

[WTS2702]

What about the 6XC and the others, and 6mmAckley, for lighter bullets, like 87gr and 75gr, going fast?

 

[Patton243]

I read people saying on here that a 6XC will equal or shoot faster than a 243. I think this is some BS IMO. Larger case capacity and more powder burning in most cases is going to gain greater velocity. Case and point: I have a 300 WSM and my friend runs a 300 win mag. Once you get over 180 grain bullets, my 300 WSM cannot reach the velocities of his 300 win mag. This is the same concept for a 243 and a 6XC. I considered re barreling my 243 to a 6XC, but I see no significant improvement for my use. I can care less if my 243 burns 6 grains more of powder honestly. I can get Lapua brass for mine and 243 components are commercially available EVERYWHERE in the world. A 6XC is not. I'm on my second 243 barrel and I've learned H1000 definitely extends barrel life if you want to argue that factor. The only thing the XC has over the 243 is the case design. And with that being said, the 243 was developed in the 1950's and still WORKS as well as a 6XC. Good luck.

 

[markgrabowski]

Any reason why the 6dasher is not among the list of cartridges? My understanding is that the dasher would be in the same velocity class (105gr @ 3000-3100) as the rest of them.

I have had several 6xc 1000 yd rifles but no experience with the dasher. I think my next barrel will be a dasher now that commercial brass is available and I will never have to trim brass. Seems to me that a dasher would have most of the benefits that were listed for the other cartridges such as quality commercial brass, accuracy potential, ect.

-Trevor

Trev, did you decide what round you'll go with next?

 

[jakelly]

I chose to convert from the 6x47 to 6comp match. If the comp match proves to be what many users are claiming, then there's some tangible benefits there. Barrel life of a Dasher and velocity of a 243. Something's up with H1000 low pressure loads. At this point I'm basing my decisions on whether I can meet my velocity goals using H1000.

 

[ROCKJAG4]

I chose to convert from the 6x47 to 6comp match. If the comp match proves to be what many users are claiming, then there's some tangible benefits there. Barrel life of a Dasher and velocity of a 243. Something's up with H1000 low pressure loads. At this point I'm basing my decisions on whether I can meet my velocity goals using H1000.

DON'T FORGET THE 6X250 ACKLEY IMPROVED. IT'S BETTER & OLDER THAN ALL OF THEM.

 

[ncboiler]

I chose to convert from the 6x47 to 6comp match. If the comp match proves to be what many users are claiming, then there's some tangible benefits there. Barrel life of a Dasher and velocity of a 243. Something's up with H1000 low pressure loads. At this point I'm basing my decisions on whether I can meet my velocity goals using H1000.

Exact reason I'm having a 6 Competition Match done. We'll see how the experiment works out.

Gotta say the 6 Vortex looks great as well. Might have gone that route if I didn't come across the 6CM first.

 

[rifleman700]

View attachment 992406


^^^Here is RL26. Same as RL17 except adding that its a compressed load. I tested this powder in a 7saum and really like the velocity and accuracy but did not like the heat generated and the throat erosion properties of this powder. My opinion of course as I like to shoot and not replace barrels every 1200 rounds.

Update to comments / opinions I made concerning RL17 and RL26 and the reasons I did not like these powders in the 6XC. After having a lengthy discussion with Ed Dillon at Neco about QL data my assumption that these powders are harder on the throat because of the above reasons are NOT CORRECT. He assured me that the powders burning temp has much more to do with throat wear than where the 95% burn happens.

As always, opinions are not always entirely fact based and I hope I did not leave anyone with the wrong impression on these powders. I have since gone back to RL26 in another cartridge after having this conversation with Ed.

 

[Downhill]

OK. OK. A question to the 6mm experts. If all these cartridges burn roughly the same amount of powder and propel roughly the same amount of burning gasses through the same size hole. How has it been determined the 243 Win devours the barrel at a more rapid rate? Does a sharper degree on the shoulder of the newer cases somehow lower temperature? Or does the improved angle lower pressure? Just don't see it. Got over 2,200 Rd on an 8 twist straight 243 and she's still my go to rifle for sheer accuracy.

 

[jaygorski]

I'm a fan of 6 Creed. Very accurate, easy to load for, etc etc. http://i.imgur.com/veQOzV7.jpg

 

[rifleman700]

OK. OK. A question to the 6mm experts. If all these cartridges burn roughly the same amount of powder and propel roughly the same amount of burning gasses through the same size hole. How has it been determined the 243 Win devours the barrel at a more rapid rate? Does a sharper degree on the shoulder of the newer cases somehow lower temperature? Or does the improved angle lower pressure? Just don't see it. Got over 2,200 Rd on an 8 twist straight 243 and she's still my go to rifle for sheer accuracy.

Loaded to the same pressure / velocity with the same powder, same bbl length and same bullet the 243W will produce more velocity because it burns more powder at the same pressure. The 6XC will have better bbl life because it burns less powder. The 6XC case is IMO a better fit for the 6mm bore.

 

[Milo 2.0]

OK. OK. A question to the 6mm experts. If all these cartridges burn roughly the same amount of powder and propel roughly the same amount of burning gasses through the same size hole. How has it been determined the 243 Win devours the barrel at a more rapid rate? Does a sharper degree on the shoulder of the newer cases somehow lower temperature? Or does the improved angle lower pressure? Just don't see it. Got over 2,200 Rd on an 8 twist straight 243 and she's still my go to rifle for sheer accuracy.

The sharper angle of the case results in more burn in the case as opposed to down the barrel.

 

[Terry Altom]

I think this discussion will now change a bit since Lapua has produced 6 Creedmoor brass. I'm still infatuated with the 6 SLR, though.

 

[AckleymanII]

Patton, I have a 31" 6XC.


39g of H4350 is 3130
40g of R#17 is 3200
plama brass-450 or 7 1/2
107g Sierra MK
got 500 rounds on 15 cases and still going
Barrel scopes excellent

I have no idea of the velocity of a 31" 243

 

[Laurie]

OK. OK. A question to the 6mm experts. If all these cartridges burn roughly the same amount of powder and propel roughly the same amount of burning gasses through the same size hole. How has it been determined the 243 Win devours the barrel at a more rapid rate? Does a sharper degree on the shoulder of the newer cases somehow lower temperature? Or does the improved angle lower pressure? Just don't see it. Got over 2,200 Rd on an 8 twist straight 243 and she's still my go to rifle for sheer accuracy.

It's supposedly a result of the position of the Turbulence Point (TP). Those who subscribe to this hypothesis say that as the charge is in its final stages of combustion a highly erosive ball of burning kernels and turbulent super-temperature gas is pushed to the case-mouth area or just beyond. Its exact position inside / outside of the case-mouth is determined by a combination of shoulder angle and neck-length.

To ascertain the TP's position, take an accurate case drawing and extend the shoulder lines forward - where they intersect is allegedly where the TP is created and burns out. If inside the case-neck, the barrel gets some protection, if outside the throat goes quicker. The 243 Win has a short neck and 20-deg shoulder so the TP is well outside of the case-mouth. It's said, can't confirm as I've never owned both members of the pair, that the 6mm Remington gives better barrel life than the 243 Win despite having a slightly larger capacity case, and despite being loaded to slightly higher pressures, because its long neck keeps the TP inside the case. The sharper shouldered 6mm Super LR with its long neck would be better still, likewise the 6XC.

This is all AFAIK hypothesis, but there does seem to be something to it. Having said that, I've never been convinced by the claims that you can in effect hotrod the 243 case and still somehow get significantly better barrel life by reforming it to the SLR shape. .... and I say that as one who shot a 6SLR barrel out in pretty well the number of rounds that I'd expect from either the 243 or 6XC at similar performance. A nice cartridge though.

 

[tonysnoo]

hmmmm. I think roughly .140 body length separates them all. I have a ton of time behind a 6slr. It was my first leap into the wild cat kingdom. Easy-peasy....got 2500 rounds out of it and prolly shouldn't have........ put it away from an f class practice so hot it scorched the foam in my case....dumb..dumb., but it still gave me good life and accuracy...competitive to the end.

I shoot beside my buddie's 6xc all the time. With these two rifles and a few different barrels, we have come to the conclusion there is no replacement for displacement... unless you dont care about brass life.

We have recently built a set of 6BRX repeaters and are giggling to our selves. They shoot slightly faster than his go to 6XC load, but are accurate as all get out. Not as fast as the SLR, but I certainly gotta give the accuracy nod to the BRX.

So....tomato ....tomahto.... you can make em all work.

 

[Terry Altom]

Tried looking for a good picture of a 6 Creedmoor beside a 6SLR, but didn't find one. If anyone has one, please post. Thanks much, Terry