6mm SLR/ 6XC experiences??

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lyle1

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Does anyone have any experience using the 6mmSLR or 6XC? How do they compare with the other similar cartridges like a .243 winchester? Do you, in reality, gain better barrel life and a ballistic advantage over other case designs?
 
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I have no 6mm SLR experience but ordered a 27" long 1-7.5" twist 6mm barrel and am considering only 3 chamberings for this barrel:
  1. 6 BR, best accuracy, best barrel life, lowest velocity, does not feed from magazine
  2. 6 XC, excellent accuracy, very good barrel life, 27" velocity is as good as 24" 234 Win, feeds well from magazine
  3. 243 Win, very good accuracy, good barrel life, best velocity, feeds well from magazine
Life is full of compromises and 6XC is just about perfect while feeding from a magazine.
If magazine feeding was not a religious issue for me, I'd probably go for a variant of 6 BR since it is so accurate.

With a 27" barrel, 6XC can safely lauch a 115gr VLD at 3000fps with match winning accuracy.
I'm not sure that any other 6mm cartridge provides a better combo of ballistics and accuracy.

There are better, more powerful cartridges (6.5-284, 284, 7 WSM) but I want low recoil and good barrel life.

Alex
 
I have been completing research on various cartridges, and stumbled upon
the "Case volume to bore area ratio", chart. It actually lists the 6XC with a 1041.5 ratio, and right after it, is the .284 Win, at 1041.9. This appears to me that the barrel life of both of these cartridges will be the same. In life and shooting, there are no free rides.....If you want the low recoil and wind cheating 115g 6mm class bullets, you have no choice but to use a larger case, which will wear out barrels quicker. I can imagine the 6mmSLR will only be worse than the 6XC with more case capacity.
 
I have a 6xc with a 28" Bartlein on it.I can get 3050 with no signs of pressure with both the 115VLDs and the 115 Dtacs using H4350.Accuracy is good and getting better as I refine things.Do you really need more speed?
 
pat84 said:
The 6mmBR can be fed from a magazine. I have 1 that feeds from a modified Remington 700 floor plate quite well.
Click to expand...

It's possible and I've read that some shooters have managed to modify AICS 10 shot magazines to feed 6mmBR but I want a solution that feeds well 100% of the time under all conditions! I will be shooting high power rifle in Vermont and upstate New York (North East US), so want a proven cartridge.

Alex
 
I'd go with the slr just because of the fact that you have the extra case capacity... if you need it that is. In order to get SLR performance with the xc you have to push it really hard which is hard on brass and the barrel... if you can even run it that hard. With the SLR you can tune down to XC speeds and you have cheap and readily available brass from winchester.
 
Bigger case, more speed potential, increased bore wear. That's all there is to this debate.

If you take a big case and run it too slow (pressure too low), you can run into serious accuracy issues at LR.

Just remember that any long pointy bullet that needs a 7 or faster twist is going to get real fussy on max accurate speed and pressures. If you look at ANY high BC small cal bullet in use, they are run at 3000fps and SLOWER. There is a reason for that.

Size the case to get the max speed (bullet and twist limited) you want at the max pressures your rig can sustain under any match conditions (sub 65000psi is a smart idea). Match that case volume to a powder that will give you 100% load density or slightly compressed at max pressure. This will yield the best combo of speed AND accuracy.

There are only a few working combos for any cal and bullet.... Unless the powder manf start releasing some of their new gen voodoo powders.

Longer barrel, smaller case to get the same speed, etc.

Jerry
 
I have been looking at this chambering as well... the positives are the shoulder angle and the longer neck.

AlexF said:
Has anyone considered a straight 243 Win?
I'm seriously thinking of doing this but 243 Win last major competition win was NRA High Power in 1993...

Alex
Click to expand...


Hi Alex

There was a more recent victory by
John Whidden in 2009 he was shooting a 243 and 105's

http://www.accurateshooter.com/shooting-skills/john-whidden-shares-championship-secrets/


to answer the OPS question (picked off of the SLR website)...
The 30 degree shoulder angle of the 6mm Super LR is another potential benefit of the Super LR. Not only does it help to avoid the throat torching effect that people associate with the .243 Winchester (because of the .243's short neck and mild 20 degree shoulder angle), but other case designs with 30% shoulders have been very popular

243_win_vs_6mm_super_lr_vs_6xc_zwb0.jpg

The 6mm Super LR (center) next to a .243 Win. (left) and a 6XC (right).
The 6mm Super LR has the case capacity of a .243 Win.
but the long neck and 30 degree shoulder angle of a 6XC - it's the best of both worlds!

Other interesting factors for me are that it can use 308 or 243 brass (readily available) and the 308 case means it functions in a ai mag.

the longer neck allows you to seat bullets ahead of the neck shoulder junction which has additional benefits.

as mystic has pointed out the bigger the case the more velocity which means better ballistics. if you want a flat shooting 6mm check out the crusader it is a improved 6mm remington.
 
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trevor60 I have formed some 6SLR brass out of 308 and I was ending up with short cases , what I did is anneal between steps .

I ran a 308 casing straight through a 260 die once then annealed and ran it through the same die again twice.
Then I annealed again and ran it through a 6br fl die twice the brass was then long enough to trim and turn the necks.
 
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