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It's a 6.8 necked down to 224 and shortened 1mm(5.56x42). 55gr Noslers are hitting 3500fps out of a 20" barrel. 75gr Amax 3250 at the sweet spot. I've shot the 80 Amax(BC .473) over the chrono at 3050 but haven't shot for groups yet.
If the 80s shoot well at 3050 they will be over 20" flatter at 500yds than the Grendel shooting the 123gr Amax.

Now that sounds interesting.

So I assume you're loading the amaxes at 6.8 mag length?

Yes, 2.295"
Jason Peterson shot a 4.5" group at 1000yds last year using the 80 Amax and N540 powder -3004fps. I think CFE and Lever produce more velocity than the N540 if the accuracy is there at the higher velocities.
I want to see how the 62gr TSX or TTSX does on hogs at 3300fps too.

that sounds very cool.

When can we expect testing to be finalized? This is very intriguing. Could make my 22-250 go bye-bye real quick.

I believe there was a guy on Sniper's Hide that was doing this chambering.

DTech has been chambering the same thing with a 30* shoulder called the 22DTI. Cousin has one and it's running just behind his 223AI's.

The 22 based on a 6.8 case should be much faster than a 223AI, case capacity of an AI isn't even close. 32.5 VS 35.5

There is apx 200fps difference between an AI and the 6.8 based cat.
http://www.6mmbr.com/223rem.HTML

This version was first chambered in 2007. It's is a simple neck down using 6.8 bushing dies but the case is trimmed 1mm shorter than a 6.8 so the 75 and 80gr Amaxs can be shot from the mag at 2.295.
I've used everything from 10X to RE17 with 75Amaxs and been able to get 1/2" or under groups. I shot 1 group of 5 at 100yds that measured .151", several .2-.3 5 shot groups.

Should get and getting are 2 different things.

Mike sent his load data and cousin was disappointed to say the least. He thought he should've got the 22pdk instead but after talking with a few owners of that one, they didn't get the suggested velocities either.

Mikes max loads were right in line with cousins findings. He did find usefulness in heavier rounds and I'll post some speeds after he gets back with me. But I'm pretty sure he gets 3650 with 50 gr bullets in his 223ai.

He lost a lot of SSA brass at first necking down but finally got it figured out. Just thought it was a lot of work to let a 223ai beat it.

I was wrong he's only getting 3635fps with 50's in his 223ai and he barely reached 3600 fps with the DTI. He could get more but lost cases after 3600.

He's getting 3410fps with 60 gr vmax in the DTI.

Sounds like he doesn't know how to load it if he's getting more velocity from something with less capacity or he's loading the AI a lot hotter than the DTI.
The DTi and PDK are basically the same thing, both have a 30 degree shoulder and add an extra 1/2gr over a 6.8 necked to 22 with the shoulder held to 23 degrees like the 6.8 is.
If you don't have a pressure system to test it's tough to know if you're shooting an AI at 70,000 psi and a DTI at 60,000.
New powders like CFE, 8208 and Lever have come out in the last few years. They are perfect for a case this size. I can shove a lot more CFE ball powder in a case than I can 4895. CFE will show 5000 less psi than 4895 and produce the same velocity.

Dunno, have the 6.8 necked to 6... it never gave the speeds I thought it should either.

BUT even slower, it was accurate and still does everything I would need of it anyway, plus it gets rid of a .277 round which is a great thing... LOL

3,250 with the 75gr A-Max is right there with 22-250 speeds.

Could be uber.



Travis

31-31.5gr CFE will get it there out of a 20" barrel.
It has been raining almost every day for 2 weeks here and the range is a mess. When it dries up some I'll get back out there.
I haven't tested much since 08-09 but now with the new powders out the 24x is back on this rifle and I'm ready to reduce the dog population around here. They are eating all the turkey eggs. They are call smart and don't come closer than 3-400.

Really wanted to get a black hole barrel in 22-6.8 to sling gaymaxes.. But now I want to see how the new TMK works at mag length.

The BC of the 77 TMK is .420. Not as high as the 75Amax at .435 or the 80 amax at .473 but it should work. I'l test the SMKs but as long as the Amaxs are grouping under 1/4" I'll stick with them.
I've seen a lot of posts from people saying the BHW barrels don't shoot the solid copper bullets like Barnes and the Hornady GMX very well, have you tried any or have a guess as to why they don't?

I'll not sweat .015 if I can load them at 2.26"

I don't want a weather report.

Get your ass out there.



Clark

The new powders may make a difference but here's the load info DTech sent. Cousin was disappointed and thought Mike was too cautious so he worked over only to lose primer pockets. Maybe he has a bad batch of brass, I know his Hornady brass holds up a little better than his SSA but who knows.
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That looks like a quickload print out not actual velocities.
Varget, RE15, 748, 2520 are in the right range for burn rate using 75s and 80s IMO.
This was from 2008- You can see I am at least 1 gr more in a case that holds 1/2gr less and still shooting groups under 1/4".
The first barrels gas port was a little large, now I know to start at .089" for a RGS 20"

5.56x42 20"- freebore may need to be shorter for Bergers
27.1gr IMR4895 75gr amax 2.35 3130 0.75
28.1gr MC IMR4895 75gr amax 2.275 3030-3060 28gr MAX---28.5 showed swipes,
AMAX seat to 2.309 try 27.3 27gr H4895 75gr amax 2.275 2990
*** 28gr MC H4895 75gr amax 2.275 3110 28gr MAX again
27gr varget 75gr amax 2.275 2870 only decent groups came at 2.29----3085fps 26"
28gr MC VARGET 75gr amax 2.282 2920 1/4" [email protected]_with Krieger
28.6gr varget 75gr amax 2.348 3096 max compression -good but verticle string lt swipes
26gr 3031 75 2.303 3065 Nice 7 in .5, 4 in .5, again nice group
26.5 3031 3030
RE17 too slow 27gr RE15 2.29 2800 .3" group------3123fps 26"
27.8MC RE15 2.31 3050
28.6gr RE15 NO 2long 2.348 3095 max - group bad lt swipes
27 4064 3134 26"
27.5 4064 2975 8-26 1/2"moa
>try 27.6>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 27.8MC 4064 3060 3 in .3
28.2gr IMR4064 NO try 28 2.348 3090 no swipe, max compression 1/2" groups
27.4gr H4350 2490 TOO SLOW---1/2"group
28MC RE17 75gr 2.31 2962 3 in .2
27.3 335 2950
28 335 3050 MAX load, bad group
25 322 75amax 2.304 2930 5 shots 3/8" slow but damn accurate
25.5 322 2945
24.5 10x 2.31 2975 4 shots in .151"!!!!!!!!
25 10x 75AMAX 3025 5 in 5/8 in 10mph wind,
25.5 10x 3040 some pressure signs
Berger touch at 2.310-314 75 BERGER
28.2 322 55NBT 2.205 3545 1/2"great load
30.3 i4895 55nbt 2.18 3450
55NBT touch at 2.215" 28.5gr h4895 55nbt 2.184 3255 decent group
xxxxxx 28.5gr h4895 55nbt 2.05 3255 Nice group at this length 5/8
29.2 h4895 55nbt 2.18 3420
28.6 Varget 55nbt nbt 2.22 3200
29gr h4895 69smk 3190 warm
28.6 Varget 69 SMK 3100

I can load and test velocity here in the shop. I'll shoot some 75s and 55s with CFE, Lever and 8208 in a few minutes.

I'm confused, you are saying 20" barrel but showing 26" barrels for some of the velocities and I did not see a 3250 fps 75 Amax load.

Yes those are from quickload but that is what Mike sent and where he is firmly stating that's his max loads he recommends. Like I said cousin tried more and loosened up primer pockets.

But the gun shoots everything great, it is an accurate round and is better with the heavier bullets. Cousin almost sold his due to the trouble it took to get less than his 223AI with 50 gr bullets (his favorite bullet weight) but tried the 60 gr NBT's (I thought it was Vmax's) and now loves the round. He switched to Imperial sizing lube and uses a 243WSSM die before going on down to 22 caliber.

He had a 223 WSSM that could've been the king but got less than 1000 rounds before toasting the barrel. Tried the 25 WSSM but saw the 22 PDK and it's reported 3900 fps with 50 gr bullets but the guy quit building them so he tried Mikes version. Long story short, he has 3 or 4 223AI's and for him they make the most sense.

I will remind him of the new powders and look forward to seeing your results.

2/3rds of that list is 75gr Amax. only the bottom portion is 55gr Noslers. I only shot a few loads from a 8 twist 3 groove Pac Nor before my 20" Krieger 7.7 twist barrel came in.
The 3290fps load I shot last week with CFE out of the production 20" 8 twist 5R rifled barrels is not on my print out from 2008.
As I test-
31gr Lever 75 Amax 2.295" 20" barrel=3246fps ave
31gr CFE=3225fps
28gr 8208=3148
55gr NBT............
32.5gr Lever=3525fps
33.5gr Lever=3588fps-max case fill
30gr 8208=3567
29gr N530=3598
29.6gr N530=3676
50gr Varmint Grenade
28.5gr N530=3703...max load.longer bullet, more pressure

28gr experimental projo
30gr N530=3984fps

The load for the 28gr bullets above had more room to increase velocity. I ordered some 30gr Varmint Grenades to see what it will do.

Info passed along and he's headed to find Leverloution now. He would like to know what brass you're running, how many loadings you're getting and which primers?

Much appreciated and will post his results later.

SSA brass, CCI 450 primers.I have at least 5 loads on each case now. Those loads above are max. he needs to start apx 2 gr lower and work up. I always work up to max so I know where it is then back off 1 gr and look for accuracy.

Cousin finally tried Leverloution in his 22DTI, temp was 80 degrees, he shot 30.5 grs under a 60 gr NBT and registered 3430 fps avg. 31 grs was hot and reached 3480 fps. 24" SS barrel. Figured he'd get more powder in the bigger case.

The 60 NBT is a flat base if I remember right, maybe more bearing surface?