Modern Sporting Rifle Evolution
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talonxracer

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Reply with quote  #26 
How about 6mm-Mad Dog, shortened to 6-MD.... it still sings along with 277-WLV
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jwtharpe

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Reply with quote  #27 
Thanks guys, Name doesn't mean anything to me really. Whats important is how well it works for our application. We know it shoots, is accurate, and easy to produce brass. Now we have to see how well it feeds and cycles. This is the last hurdle to get over. I know the chamber will need to be cleaned more often than 223, some brass will need to be neck turned, (Lapua). So far the LC that I have tried has not needed it, it has thinner shoulders than the Lapua.
We have a couple more test barrels in the works, and a couple of shooters to test them. If something unexpected comes along, we will order a new reamer and start over.

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coondog

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Reply with quote  #28 
I'll be in for this cat JW if you think you can make it work, what ever you decide to call this new cartridge. I bet Uglade never thought some of his cats would be used in a AR.
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jwtharpe

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Reply with quote  #29 
Case- LC96
Primer- 450
Bullet- 55 Nosler Varmageddon
Trim- 1.700"
Powder- LT-32
Barrel- 26" 4G,8T
OAL-2.270"

26.0gr.
1-3367
2-3350

26.5gr.
1-3392-av-3392
2-3375
3-3410

27.0gr.
1-3463-av-3460
2-3454
3-3463

27.5gr.
1-3527-av-3521
2-3527--es-28
3-3527-sd-12
4-3499
5-3527

Case- LC96
Primer- 450
Bullet- 70  Nosler Varmageddon
Trim- 1.700"
Powder- LT-32
Barrel- 26" 4G,8T
OAL-2.270"

25.0gr.
1-3093-av-3065
2-3058
3-3044

25.5gr.
1-3129-av3136
2-3137
3-3144

26.0gr.
1-3189-av-3191
2-3197
3-3189

26.5gr.
1-3252-av-3256
2-3236-es-40
3-3267-sd-15
4-3252
5-3276


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RangerJoe

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Reply with quote  #30 
JW: These are SMOOKIN' hot numbers! Granted - from a 26" pipe... Any excess pressure signs at the high ends?  LT30 might be worth trying for the 55~70 gr range too,
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3782Big4Hogs

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Reply with quote  #31 
watching this thread with great interest...
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jwtharpe

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Reply with quote  #32 
Quote:
Originally Posted by RangerJoe
JW: These are SMOOKIN' hot numbers! Granted - from a 26" pipe... Any excess pressure signs at the high ends?  LT30 might be worth trying for the 55~70 gr range too,

Case was full coming up into the neck with the 55's. LT-30 will work better for the 55's. The 70's work real good with lt32. Just starting to get some primer flattening with the 70's at last string. 
Lt32 is my favorite powder for the 6.8spc. It looks like its going to be a good one for this as well. 
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jwtharpe

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Reply with quote  #33 
6MM BULLETS.jpg 
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RangerJoe

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Reply with quote  #34 
Quite a line up!  Tomorrow I'll have a box of Sierra 90gr FMJ-BTs headed your way.
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jwtharpe

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Reply with quote  #35 
Thanks Joe!

I shot some 80NBT's today after it quit raining. H335 will get them down the road.

Case- LC96
Primer- 450
Bullet- 80  Nosler Ballistic Tip 
Trim- 1.700"
Powder- H335
Barrel- 26" 4G,8T
OAL-2.290"
Hits lands@ 2.325"

26.0gr.
1-2949
2-2936

26.5gr.
1-2969-av-2996
2-2996
3-3023

27.0gr.
1-3072-av3069
2-3044
3-3093

27.5gr.
1-3152-av-3120
2-3108
3-3100

28.0gr
1-3189-av-3186
2-3189
3-3182

28.5gr. these are warm with flat primers
1-3205-av-3252
2-3292
3-3259

29.0gr. these are warmer with flat slightly cratered primers
1-3252-av3262
2-3267
3-3267

be glad when the new barrels get here, anxious to see what it will do in a shorter barrel.
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MDWS

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Reply with quote  #36 
Bump  for the official naming.  6mm Mongoose
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JBFA

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Reply with quote  #37 
I like that name!
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RangerJoe

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Reply with quote  #38 
Small, fast, fearless, and deadly.  I like it! 
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talonxracer

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Reply with quote  #39 
Great name, I need one now to keep my wolverine company!
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jerdebson

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Reply with quote  #40 
If I hadn't already built a bolt 6BRX and an AR in 6BRX and a 6ARP upper, (which may get sold before ever getting shot), I would build one of these too. Sounds like a great round.
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Livn358YETI

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Reply with quote  #41 
Fantastic!! Must resist...for now.

I had a Mongoose once, this one is faster.
untitled-1_121.png 


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Dwb

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Reply with quote  #42 
I been wanting a 6x45 for a long time but I think this one is more practical beings that a guy can use heavier bullets.
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Talenel

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Reply with quote  #43 
If you can get a 80 gr to 3200+ from a 26" is 2800 out of a 16" expected? A 20" savage would be a great little niece deer gun.

I have one neice that is turning 10 soon so she needs a deer rifle
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MDWS

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Reply with quote  #44 
Quote:
Originally Posted by Talenel
If you can get a 80 gr to 3200+ from a 26" is 2800 out of a 16" expected? A 20" savage would be a great little niece deer gun.

I have one neice that is turning 10 soon so she needs a deer rifle


We have 18", 20" and 22" test barrels coming so we will see.

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helix6

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Reply with quote  #45 
Holy cow, I just saw this post, and count me in! If the price for barrels is similar to the 277WLV I want a 20" to replace my 6x45 BHW. I might actually get that 6x45 barrel and dies sold early and save all my components waiting for this to come to fruition. My biggest frustration is that getting into anything beyond 75 gr. in the AR platform with 6x45 is a huge sacrifice in velocity. 24.8 gr. of Benchmark under the 87 gr. V-Max is pushing it for pressure and I'm only getting about 2650 out of my 20" barrel (that should be very fast considering the BHW rifling). Also, the huge jump to lands is a big accuracy issue and I can only get about 2.260" max COAL with Magpul mags. I might be able to stretch that out a little bit more with GI mags.

I had really been thinking about doing a 6.5PCC, but just a first look at this excellent case design looks like it has everything I could want in an AR compatible medium size cartridge. If it can even run the 105 A-max, this thing is a home-run. I can't imagine cycling being an issue given the types of charges and powders that are optimal for it. My 6x45 is pretty over-gassed with 24.8 gr. even with a rifle gas system.

This reminds me of a sexy little version of the .280 Ackley Improved I'm shooting.

If you need more testers, I'll happily oblige.
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jwtharpe

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Reply with quote  #46 
Helix, the 105 A-max is probably a no go for closed front mag use. It will work in a mag with the front cut out. I hand feed all of the long range bullets anyways to prevent the noses from getting dinged up.
The cart. was honestly designed around a Barnes 80TTSX and pretty much any of the medium game bullets on the market fit in a mag. All of the light varmint bullets work just the same as the 6x45 but the mongoose will give you a bit more freedom with seating depth.

You own a 6x45, so you can understand the need for the Mongoose.
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45r

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Reply with quote  #47 
The sierra 85 grain HP game king should be easy to get close to the lands at mag length.
They are very accurate with excellent performance in my 243Win.
Should be a good performer in the mongoose also.
I like the 70 grain TNT and the 95 grain Nosler ballistic tip in 243Win when I'm not using the sierra 85HP.
The mongoose looks very good to me.
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helix6

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Reply with quote  #48 
The 105 A-Max may be too long, but I'm positive the 87 gr. V-Max would be really excellent in this case design and the 100 gr. Speer BTSP is only .013 longer, so maybe that would be an option although it will be a bigger jump into the lands. The bullet I really want to shoot is the 87 gr. V-Max anyway and I'm sure it will dramatically outperform my 6x45 given the much enhanced case geometry.

Is there a preliminary development schedule for this cartridge out there? I know these things take time, and 277WLV is still coming together (but quite nicely). If barrels may start to hit the market in the next year, I will sell off my 6x45 barrel and dies right now and re-focus on other cartridges. 6x45 hit it's ceiling really quick for me unfortunately. Knowing what I know now, I would not have jumped into the 6x45 - but I'm sure it will be good for someone wanting to shoot lighter bullets exclusively.
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jwtharpe

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Reply with quote  #49 
Got the gas turned on today. The length of the gas system is 2" longer than rifle length. The port is .098". I was hoping to end up around .090" but it wouldn't cycle at 90.

Ran some 70 Nosler tipped Varmageddon's over some 335 with the gas on. It functioned perfect once I got the port large enough.

Bullet-70NVG
Case-LC96
Powder-335
Primer-450
OAL-2.260"
Charge-29.0gr

1-3367-av-3373
2-3368-es-34
3-3384-sd-13
4-3392
5-3358


P-Mag with some mongoose's inside

 6mmpmag.jpg 


Pic of the rifle. I put this one together to beat on one of those other cartridges....
6Mongoose.jpg 


Helix the 87Vmax works at mag length. Basically just take a 6x45 and subtract .070" the Speers will work too just looking at their ogive length.

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RangerJoe

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Reply with quote  #50 
Yee-Haa!  Very nice!  [biggrin]
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