My Rem 700SA in 6SuperX

btrapr

btrapr

Sergeant
Full Member
Minuteman
Nov 27, 2008
106
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Piedmont area NC
#1
accurized Remington 700, oversized lug, custom profile unturned Shilen 6mm 1-8", 26" finished length, alum firing pin, chrome silcone spirng, 2.5# trigger, H~S steel floorplate, Three 10round magazine, One 5 round mag, Manners fiberglass stock, Vortex Viper 6.5-20 mil-dot, the rifle is chambered in a 6mm SuperX aka: 6mm SuperLR. The cartridge was diesgned by Precision Shooting magazine editor Robert Whitley for shooting 600-1000yd rifle matches.
**I need to repaint it as the green that I used did not turn out.
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#4
Re: My Rem 700SA in 6SuperX

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bvmoney</div><div class="ubbcode-body">So its a 243 necked down to 6mm? But isnt the 243 already a 6mm bullet? Wheres the advantage?</div></div>

it has a 30° shoulder, and slightly less body taper compared to a standard 243
 
#5
Re: My Rem 700SA in 6SuperX

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bvmoney</div><div class="ubbcode-body">So its a 243 necked down to 6mm? But isnt the 243 already a 6mm bullet? Wheres the advantage?</div></div>

Here is Whitney's page on the 6SLR.
http://www.6mmar.com/Super_LR.html

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Heavies</div><div class="ubbcode-body">I am interested in this cartridge. What kind of accuracy and velocity are you getting? </div></div>

I would be interested as well.
 
#7
Re: My Rem 700SA in 6SuperX

I was also thinking of getting this chamber. With a 1:8 barrel you must intend to shoot 105-108's. I'd like to see where the accuracy node is at with those weight bullets. In Roberts article, he says he runs 115 right near 2900 to 3k fps. If 105-108s can go 3100-3200 accurate then that would be something.
 
#8
Re: My Rem 700SA in 6SuperX

I like the fact that the neck is longer, this should push the heat further into the barrel and not butn the throat area as bad. I'd like to know how many round you end up getting out of a barrel. Looks like a decent design. I like it.

xdeano
 
#9
Re: My Rem 700SA in 6SuperX

I'm able to run 105's or 107's to 3150 to 3200 depending on the powder and primer and be consistent with 1/2 minute groupings with mine.

There are several good powders that will get you great velocity, but the slower, single base powders burn much cooler and will stretch your barrel life compared to the double base powders.
 
#10
Re: My Rem 700SA in 6SuperX

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: onlyfineknives</div><div class="ubbcode-body">I'm able to run 105's or 107's to 3150 to 3200 depending on the powder and primer and be consistent with 1/2 minute groupings with mine.

There are several good powders that will get you great velocity, but the slower, single base powders burn much cooler and will stretch your barrel life compared to the double base powders. </div></div>
this sounds like an intersting round, cant argue with those velocities. have you tried the dtacs yet?
 
#11
Re: My Rem 700SA in 6SuperX

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">I'm able to run 105's or 107's to 3150 to 3200 depending on the powder and primer and be consistent with 1/2 minute groupings with mine.</div></div>

Wow, looks like at those speeds you run flatter and slightly inside the 115's. Do you run those in F-Class?
 
#12
Re: My Rem 700SA in 6SuperX

I don't run dtacs because if you look at Bryan Litz bc testing you'll find that the bc of the dtac is not that much more than the 105 vld or the pointed 107 sierra and you can run them much faster which makes up for the very little bc difference.

If you look up John Whidden's information (multi time 1000 yard champion) you'll find that he shoots 105 vld's at 3300 out of a standard 243. Note that he does use a 32 inch barrel.

I'm currently shooting a rem action with a 28" bartlein barrel and am about to take delivery on a surgeon with a 28" krieger. I have'nt shot out my first barrel yet, but I'm hoping for a little more barrel life than the 243 - we'll see.

Overall, I feel like there may be benefits to the round and I don't see any drawbacks because you have to run new brass through a sizer anyway. All you have to do with the super lr is start with 243 brass, size it, and shoot it.

So I see no possible downside with it (other than not having a factory loading which I never shoot anyway) and only see potential benefits. I liked it well enough to purchase my own reamer so that I can have barrels done by anyone, anytime.
 
#13
Re: My Rem 700SA in 6SuperX

This round shoots as well forming the case as it does fire formed. I ran 105s in mine at 3000fps+ and it is deadly accurate. Load testing at 400yds I was shooting .75" 3 shot groups using H1000.

The nice thing about this round is you can use slow burning powders and still have enough case to get the velocity to push the heaier bullets. I originally had a 6XC and rechamered it to this round. I loved it. My barrel started to go south at around 2800rds. It will still shoot .5moa and under at 600yds but starts to open up and get fliers at 800 to 1000yds so I had it rebarreled.

Its just a standard 243 case with a 30 degree shoulder and a longer neck. Sort of a over grown 6BR.
 
#15
Re: My Rem 700SA in 6SuperX

Would a 6X47L run in the same ballpark, pushing 105-108's, while burning less powder?
Or would 6superlr have an edge? I mean if you will run them 3050, then the 6x47L can do that, but if there is an accuracy edge at 3100-3200 with out bullet failure, then the superlr might be a winner.
Has anyone shot many rounds in a F-class match with 105-108's at 3100-3300 with this, and still be accurate all day?
 
#16
Re: My Rem 700SA in 6SuperX

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Heavies</div><div class="ubbcode-body">Would a 6X47L run in the same ballpark, pushing 105-108's, while burning less powder?
Or would 6superlr have an edge? I mean if you will run them 3050, then the 6x47L can do that, but if there is an accuracy edge at 3100-3200 with out bullet failure, then the superlr might be a winner.
Has anyone shot many rounds in a F-class match with 105-108's at 3100-3300 with this, and still be accurate all day?
</div></div>

I am running 3166fps with my 6x47L using 40gr of RL17, CCI450 and 107SMK. Barrel is a Broughton and length is 26". SD of 13,not great but groups are sub .5. Load shoots great and is more consistent then I am for accuracy. The RL17 picked up 120fps over same weight of H4350 with a bit more room to go. I quit load workup as accuracy was well better than enough for a LR dog rig. Built twin brother the near same rifle using same reamer but a Krieger tube and it will run roughly 75fps faster than the Broughton did with same loads. His load is same except for 105 Bergers. IIRC he chroned it just under 3250fps with the Berger.
 
#17
Re: My Rem 700SA in 6SuperX

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">I am running 3166fps with my 6x47L using 40gr of RL17, CCI450 and 107SMK. Barrel is a Broughton and length is 26". SD of 13,not great but groups are sub .5. Load shoots great and is more consistent then I am for accuracy. The RL17 picked up 120fps over same weight of H4350 with a bit more room to go. I quit load workup as accuracy was well better than enough for a LR dog rig. Built twin brother the near same rifle using same reamer but a Krieger tube and it will run roughly 75fps faster than the Broughton did with same loads. His load is same except for 105 Bergers. IIRC he chroned it just under 3250fps with the Berger.</div></div>
Are you running them on the hot side or is the pressures normal?
 
#18
Re: My Rem 700SA in 6SuperX

I am a big .243 fan and if there is a cartridge that needs to be improved the stretchy 243 win is it. But since you can only use win and rem brass in the superX, what is its advantage over a straight 6mm rem (26 degree shoulder)? Unless the the 6mm rem is too long with 105/115's for a short action it seems like it would work as well or better with a lot less hassle. Has anyone actually shot the superx enough to document longer barrel life? Not knocking it just curious.
 
#19
Re: My Rem 700SA in 6SuperX

Heavies
Sent you a PM. Didn't think it right to post other info other than a comparison on btrapr's thread.

Sorry for the subject change.

Respectfully,
Dennis
 
#21
Re: My Rem 700SA in 6SuperX

<div class="ubbcode-block"><div class="ubbcode-header">Quote:</div><div class="ubbcode-body">Is there an increase in barrel life over the .243?
</div></div>

With the longer neck and 30 degree shoulder, theory says it should increase barrel life. But this is a fairly new round, and I have seen only a few reports.
Wish the OP would let us know how it shoots.
grin.gif
 
#22
Re: My Rem 700SA in 6SuperX

SDWhirlwind,

Yes, you can run the 6x47 to 3150 plus with RL17 but the powder burns hot and erodes the throat quicker than H1000 or VV N160 or N165. I have run my 6mm super lr to 3250 without sticky bolt lift or unreasonable primers with RL 17 and probably could have gone faster, but I didn't take it any further.

The issue is that the super lr can run the same or higher velocities easier and with cooler burning powders that don't erode the barrel as quickly.
 
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