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View Full Version : And now for something completely different..........


killshot44
04-06-2011, 5:54 PM
I began shooting matches at Sacramento Valley last year and built up a nice White Oak Precision in .223 for the F/TR class.
Lobbing 80-grainers at 2,700 puts you on even ground with the .308s and it's a really fun class to shoot.

But I wanted something with 6BR-type performance to shoot in F-Open but still be in an AR frame to also use in High Power matches
that involve rapid fire. I found Robert Whitley (6mmar.com) who builds a number of Wildcat cartridges and decided to go with.........
the 6mmARturbo40.
http://i878.photobucket.com/albums/ab348/Killshot44_bucket/6ARturbo40/4-6download012.jpg
Left is a .223 loaded with a 77gr SMK at magazine-length.
Middle is a 6.5Grendel case.
Right is a 6ARturbo40 loaded with a 105gr VLD seated to meet the lands. The case is a 6.5Grendel which is necked-down and then fireformed,
this moves the shoulder forward and leaves a 40 degree shoulder. The case holds 30.5+ grains but I'm getting 2,850fps out of only 29gr of Varget.
Barrel-life is around 3,500, very good for a 6mm. The cartridge falls between a 6BR and a 6Dasher. Supersonic past 1,300, great accuracy to 1K.


This chambering puts it into the F-Open class, so a mechanical front rest is allowed. Rest shown is a Farley Coaxial.
http://i878.photobucket.com/albums/ab348/Killshot44_bucket/6ARturbo40/4-6download002.jpg
http://i878.photobucket.com/albums/ab348/Killshot44_bucket/6ARturbo40/4-6download005.jpg
http://i878.photobucket.com/albums/ab348/Killshot44_bucket/6ARturbo40/4-6download013.jpg
http://i878.photobucket.com/albums/ab348/Killshot44_bucket/6ARturbo40/4-6download004.jpg
Early load development, a couple of five shot groups at 100...
http://i878.photobucket.com/albums/ab348/Killshot44_bucket/6ARturbo40/6TurboB105VLD3-30-11.jpg


Build Specs
Krieger 26" .243 x .236 8-Twist 4-groove Heavy Varmint Contour (gas port moved forward)
Billet Side-Charger Upper
2.25" Steel free-float tube with 3" bag-rider
Spikes Lower
Geiselle High-Speed National Match trigger - 4oz 2nd stage
Titanium firing pin from X1
Tubb Carrier Weight System and Flat Wire buffer spring
Phase 5 ver.II BAD
Bob-Sled single-feed magblock
Ergo grip w/shelf
GG&G extended rail riser
NightForce NXS 8-32x56 NP-2DD with NightForce 20moa UniMount
Custom stock by XLR Industries
Farley Coaxial rest and EdgeWood original tall rear bag

Anyone who comes up to this Sunday's match can take a better look. Hope you like. I sure do.

killshot44
04-06-2011, 6:05 PM
The Upper was the 243rd ever made. I'll take it as a lucky coincidence (243=.243/6mm) It even shot well during testing.
http://i878.photobucket.com/albums/ab348/Killshot44_bucket/6mmtesting.jpg

Here's a better shot of what the front bag-rider looks like
http://i878.photobucket.com/albums/ab348/Killshot44_bucket/front_bag_rider.jpg

Bug Splat
04-06-2011, 6:14 PM
NICE! That is sexy. Must be a lot of fun to shot. I've always wanted to do a side charging AR build.

Fjold
04-06-2011, 6:27 PM
Nice looking gun, interesting cartridge.

IPSICK
04-06-2011, 7:21 PM
Thanks for sharing. The shooting and the rifle looks superb. Shamefully, I am drawn to how nice that XLR stock looks on your AR. Did you initially use the stock for an iron sight setup? I am wondering because of the high adjustment cuts on the cheekpiece.

Still waiting for mine, apparently a special request for higher cuts on the cheekpiece have delayed mine and others orders. :(

Pthfndr
04-06-2011, 8:09 PM
Nice looking rifle Andrew. Are you going to shoot the .223 on Saturday and this one on Sunday?

You know, your Farley costs more than the last complete AR I built :)

See you out there this weekend.

killshot44
04-06-2011, 8:42 PM
Thanks for sharing. The shooting and the rifle looks superb. Shamefully, I am drawn to how nice that XLR stock looks on your AR. Did you initially use the stock for an iron sight setup? I am wondering because of the high adjustment cuts on the cheekpiece.

Still waiting for mine, apparently a special request for higher cuts on the cheekpiece have delayed mine and others orders. :(

How funny, I'm the one Kyle is doing the special for....:cool:

My scope setup is not low by any means, but still I had to raise the slots so the cheekrest would be low enough. I buggered mine up a tad so he's making one to my spec. I did let Kyle know that since Mark was marketing them to AR owners he should offer one with even higher slots to accomodate iron sight users. Otherwise, you'd need to lose the cheekpiece...

Vanilla Gorilla
04-06-2011, 8:50 PM
nice gun

artmachine
04-06-2011, 8:51 PM
that's a great stick!!!! wow. thanks for the cartridge info.

killshot44
04-06-2011, 8:55 PM
Nice looking rifle Andrew. Are you going to shoot the .223 on Saturday and this one on Sunday?

You know, your Farley costs more than the last complete AR I built :)

See you out there this weekend.

Haven't decided. I'll need to transfer the NF to the .223 then put it back on the 6mm Saturday afternoon and re-zero it for Sunday morning.

Or maybe I'll just load up some mag-length 6mm rounds and slap the Sinclair bipod on her. :43: Yeah, that'll work. F-Open RMC, anyone?
http://i878.photobucket.com/albums/ab348/Killshot44_bucket/6ARturbo40/DSC_0123-1.jpg?t=1302148228

Don't remind me about the Farley...I got a deal but still, I'm trying not to think about it.

phish
04-06-2011, 9:46 PM
I saw two turbo 40 uppers on Whitley's website and was fighting the urge, good thing they were gone within the week...

Good ballistics on the cartridge, just don't try shooting through dust devils. I like the Dasher reamer that Whitley had done, would make a nice 2nd barrel for the Barnard...or CG...:)

IPSICK
04-06-2011, 11:33 PM
How funny, I'm the one Kyle is doing the special for....:cool:

My scope setup is not low by any means, but still I had to raise the slots so the cheekrest would be low enough. I buggered mine up a tad so he's making one to my spec. I did let Kyle know that since Mark was marketing them to AR owners he should offer one with even higher slots to accomodate iron sight users. Otherwise, you'd need to lose the cheekpiece...

Now that's really funny because I thought it was my cheekpiece that was holding everyone's order up. Glad it isn't just me.

I'm actually going to use mine on an iron sight AR.

natchamp
04-07-2011, 8:41 AM
Nice setup ! I'm jealous of your scope. I'm currently putting together a regular 6mmAR version. How do you like the 26" barrel? I'm going back and forth between a 22,24 and 26 and can't decide. cheers.

CK_32
04-07-2011, 8:44 AM
I'd hate to see that down the line.. BEAST!