My new 6SLR

[XTR]

The guys at Predator finished this up for me this week.

R700, 6SLR with a .075 Freebore, McM, Steiner, Harrell's brake, 25" Hawk Hill. Bottom relieved to feed full length rounds from Accurate mags (2.9something) and it's also got a 22" 308 tube with a Badger 3 port brake (looks just like the Harrell's but with 3 ports), all in Coyote tan.

Bob does a cool deal with the ½ inch socket in the bolt, it's actually a steel socket press fit into the handle.

I'll add a comment about the reamer and free bore here. My reamer has a .075 freebore.

Sierra 107s are 2.825 or so OAL to the lands in my rifle. I'm jamming 20 while I'm doing my initial load work so they are 2.845 OAL and barely fit into AICS mags with the front plate. I haven't tried the 105Bergers yet, and I may not if the 107s shoot well enough.

If you have Accurate mags (I have several) they can be loaded to 2.945, but you need to have the action worked on to feed them that long.

I've never shot a 6mm before but I expect that I'll have to chase the lands a bit if it lives up to the reputation of a barrel burner.

If you are planning to build a rifle similar to the one above and run bullets from mags I'd suggest that you think about what mags you want to run, and how long you want to be. A 75 seems about perfect for stock AICS mags, if yoiu get much more than that you need to be set up to run Accurate type 2 or AICS w/o the plate.

 

[jsthntn247]

Good lookin stick and well thought out. I'd run h-1000 to extend throat and barrel life. 47-48 grains

 

[boltfluter]

Very nice build. You just need to flute the bolt to finish it off. I know a guy. Lol.

Regards, Paul

www.boltfluting.com

 

[potatoe]

Very nice build. I am interested in some range reports. Please post your loads and groups and if you have any issues feeding, the SLR does seem like a nice varmint and deer cartridge. Also is your bipod on backwards?

 

[XTR]

The bipod is on right, legs ford forward.

Using new brass I have tested up to 46.5 grains of H1000, can't get any more than that in them, and I'm using a long drop tube. The load looks like it will be at about 46.0 or so based on one test.

I'm getting about 2880 with 107s at 46 grains. I may look at 7828 or 7828SSC, according to the internet both are supposed to be the stuff for velocity with 6mm in this size case.

 

[idahoorion]

XTR,

your info is the about the same as mine. with the same spec reamer 107 SMK or 105 hybrid take up just about all the room in a unmodded aics mag. the freebore could be a little shorter for me. althought spec'd like it is the neck is just right for the shank of the bullet. I am using h1000, and using win brass I did load testing up to 48 grains, I had no pressure signs but backed down to 47 grains to put me at 3015 fps, 26" benchmark. I did not have issues fitting in the 48 grains but did have a little crunch and no rattle. The barrel has speeded up running dope now says she is 3065. could be the warmer weather too. accuracy is good. easy to load, just did my first throat polish (a la competition match).
Good shooting
Idahoorion

 

[XTR]

I'm sure I will be able to get more in the cases after they are fired, but in new WW brass w/o a drop tube the powder is almost to the case mouth. With the drop tube (my 24" one for my BPCR cases) it's just into the neck. I'll have to look and see what it looks like on fired cases.

Another possibility on capacity is head space. My head space is 1.642 to the .375 data line. This is a wildcat, so there isn't any real spec. If your smith ran the reamer in a little further then there would be more capacity in there. My chamber is pretty much exactly to the reamer print from PT&G.

edit: after thinking about it I realized my first batch of test cases I over sized by .008, looking at the capacity on my cases that are the proper length the capacity is there for 47 or 48 grains

 

[MOShooter]

I've been running 43.8g H4831. My reamer has .120 freebore. My OAL is 2.860. I've measure my speed twice and am adveraging 2888 with hybrids. It shoots about 1/4" at 100y, 1" at 300y. I've shot a couple fclass 600y matches with my best score being 289 9x. Which I feel is pretty good with a tactical rifle from a bipod and sand sock. I've done some limed testing with H1000 looking for more speed 46.4g showed some promise. Shot my best 3 shot 100y group today with it. Only had 1 round to chrony and it came out at 2943. 24" barrel. I would post some pics if I knew how.

Scott

 

[XTR]

I tested up to 47.4 of H1000 today. Looks like I'm going to load between 47.1 and 47.4, velocity in there is very stable at around 2935 (8 rounds with ES of 10)

 

[Rtheurer]

A good back up load in case you need it is 43.0 to 43.5 of H4831 SC. Seems to work in ALOT of guys guns.

Good luck

 

[1lnbrdg]

~45.5 Gr N-165 for me.

 

[Eric Leonard]

I was thinkin about the SLR for another bbl for my steel banger but my BRDX will do 3000 with 105s with 10 grs less powder,,,why would you want to burn 10 more grs powder for same ?

 

[Rtheurer]

Because we can..... Because we can.......

Lets see you hit 3100+ with that lil fella.

RT

 

[Eric Leonard]

thats a good a reason as any I guess,,

I was seriously lookin at the SLR for when I rebarrel my 6.5x47 but IDK,,I am getting 3030 fps from the BRDX with 36 H4350,,if I would only be gaining 100 fps be adding 12 grs of powder I am not sure that is what I am lookin for,,

I do like the 6mm 105-107 bullets though,,
how much difference is there between the 6x47L,,the 6XC and the SLR ??

 

[XTR]

I was thinkin about the SLR for another bbl for my steel banger but my BRDX will do 3000 with 105s with 10 grs less powder,,,why would you want to burn 10 more grs powder for same ?

How long is your barrel?
How will you feel when you lose a bunch of cases out banging steel? With the 6SLR you just size more and load, no forming. All of my load testing to date has been with new brass.

What powder and pressure are you running? Can you get 3000FPS with H1000? I'd be running a lot less powder with H4350.

The biggest draw for me in the 6SLR is you just size, load shoot, just like any other new case, you are not "forming" the case with the first firing, and conventional wisdom would seem to indicate that a longer neck and a 30* shoulder makes it better than a straight 243.

 

[Raptor]

mr.big, the one big advantage of the SLR over the BRX is that with the SLR you can use "Slow" burning powders and get a lot better barrel life. My SLR with a set back now has 3400rds on it and still shooting well. I use H1000 with the 107s.

 

[Rtheurer]

I don't feel the need to defend the SLR. I have been shooting it since before it was called the 6mmSLR and called the 6mm SuperX so that goes back closing in on ten years now I guess. I also have a 6BR which I love dearly. looked real hard at the 6BRDX and still may do that down the road. Yet when I NEED a little horse power and or something that actually feeds from a Magazine it wont be the 6BRDX.
With IMR 7828SSC I hit a high velocity of 3278fps at its max pressure. Just wanted to see how high it would go to reach max and that is where I ended up. I am not a big on speed so I don't run them up there as there is no need. I use my wind reading skills to get the job done and a more accurate combo if it is a little slower. Keep in mind this is with a 30" barrel and not the 24" and 26" barrels everyone is talking about above.

I am surprised the BRDX can hit 3000fps with a 26" barrel however.

Russ T

 

[rminut]

nice rifle. I hear that a proportion of your brass can be lost since you are moving during PRS matches. there is no way i'm losing lapua brass every match compared to winchester! 6SLR is popular with the PRS crowd for a reason.

 

[idahoorion]

rminut,

yep you're going to lose a bit of brass, not as much as you might think tho. mark your brass so it's easy to sort at a glance and also the 243 length with the steeper shoulder and long neck gives it a distinctive look so if somebody does pick it up they will give it back.

I think you could spec a reamer for Lapua or Norma brass if so inclined. but I am not sure the thicker brass would play well with the neck being formed out a bit of the shoulder on the slr case. might force you to turn the neck?

Idahoorion

 

[XTR]

I think you could spec a reamer for Lapua or Norma brass if so inclined. but I am not sure the thicker brass would play well with the neck being formed out a bit of the shoulder on the slr case. might force you to turn the neck?

Idahoorion

Everything I've read says you'll get a donut if you use Lapua, but if you spec'd your reamer and bullet choice to stay forward of it you might be OK. Russ would know more about that, I've seen some of his sizing experiments so I'm sure he's tried it. (ever see a 45ACP necked to 223? ) The other think you may have to watch out for is you reamer neck, Lapua will be thicker than WW. My reamer has a .275 neck, that gives me about .005 clearance with WW, I'm pretty sure I'd be in the less than I want range with unturned Lapua.