Fastest 6mm

[Randfal]

All this talk of speed is making me want a hot rod too!

 

[orkan]

Sorry so late responding, been on a 5 day hike/camping trip. I get around 1,000 to 1250 rounds before accuracy starts dropping off. 1 barrel usually last one prairie dog (try to get in 3 trips a year) / ground hog season and may make it till the end of gun season for whitetails.

That's not bad at all, considering.

 

[KYS]

The work on the 6mm and 270WSM hybrid has started. Action, stock, and barrels are ordered. The reamer is on order as well. This will be a really cool rifle when its done. Think we are going to call it the 6mmC4.

 

[JWR075]

It gets costly when you do not do with work. I use only Krieger or Shilen Select match and a local well known and a not so cheap local gunsmith (one of his more famous rifles 600-Yard World Record Light Gun ). But you get what you pay for in the end. Longest kill is so far is 683.5 yards on a ground hog (it took to shots, misjudged the wind that far out). We are looking at building me another 6.5wsm or a dedicated 125gr BT 300wsm, what can I say I have a slight need for speed.

 

[JWV]

I love this high velocity 6mm talk. A 105 berger somewhere in the mid 3000's, if they would hold together, would be so awesome on just about everything.

 

[Sonic Crack]

Im thinking about a 6mmRemAI or a 6mm-284, Id think they would get about the same FPS with 70-80 grainers (3700-3800?). 284 would be easier to get brass/less work to get it going. 6WSM would scream some 80 grain BT!

 

[knockemdown]

Just helped a friend work up a load for his .243Catbird with 70Nbtips. They are running just over 4000fps. That is some big medicine from a 6mm...

 

[lancetkenyon]

I would think a 6mm-06 Ackley Improved would be very close to your design requirements.

I have a .25-06 Ackley with a 28" barrel and shoot a 100 gr. SMK at 3660fps. I also had a pet load of 75gr Sierra Varminter at 3900+/-. Just for grins though. Accuracy was less than desirable (about 1.5MOA) , but dang they screamed.

Check this out...
Load 10972 detail in caliber 6mm-06

 

[LRJammer]

Years ago Rick Jamison of Shooting Times developed his own 6mm wildcat that was a 7mm Remington Mag necked down to 6mm for coyote hunting. I dont recall the velocities that it was producing but it was pretty impressive. Naturally the barrel life was limited but so is anthing pushed that hard.

 

[MoBoost]

243 White Express: https://www.okshooters.com/showthread.php?155361-Anyone-Wildcat&p=1998035&viewfull=1#post1998035

 

[gatguy]

Tag for later
I have a 6x284 3600fps with 66gr bullets excellent accuracy. Fast 55gr bullets sounds fun.

I have one also, have shot most of the lighter bullets (12" twist) 3400 to 3600 is enough for me.

 

[sakobob]

didn't see it mentioned, 240 hawk it's a 280 necked to 6mm.

 

[LRJammer]

didn't see it mentioned, 240 hawk it's a 280 necked to 6mm.

A 280 is just a 30-06 necked to 7mm. That wildcat already exists, in the 6mm-06. It is a ballistic twin to the 240 Weatherby which is reasonably fast, but certainly not in the arena being discussed here.

 

[Edds]

A 280 is just a 30-06 necked to 7mm. That wildcat already exists, in the 6mm-06. It is a ballistic twin to the 240 Weatherby which is reasonably fast, but certainly not in the arena being discussed here.

A 280 is almost a 30-06 but not exactly. It's about .050" longer. I had a 6mm-280 built about 20 years ago. I got rid of it about 10 years ago and was going to have a new one built with a 26° shoulder instead of the 17.5° one. I bought a new chamber reamer and a new case form die and have never used it. I still have my original, once used, reamer, case form/trim die, and loading dies. If anyone is interested in them, I'd sell them for a reasonable price.

I don't think there is any reason to put a 6mm bullet in a larger case than this.

 

[88blazer]

There is a way to get 5500+FPS out of a 22cal 55gr with good barrel life. Check out Remington Accelerator and JD Components are producing .30 cal Sabots to fire a .223 bullet from a 30cal bore of your choice. 300RUM would get it over 6000FPS, but I heard it tends to tear itself apart from too high of velocity. J4 jackets would be a must for the RUM.

They are working on a 6mm/243 for a 270 case, or something like that.

J and D Components - Products

 

[bbcellars]

Any news on the 6mmC4?

The work on the 6mm and 270WSM hybrid has started. Action, stock, and barrels are ordered. The reamer is on order as well. This will be a really cool rifle when its done. Think we are going to call it the 6mmC4.

 

[LRJammer]

I don't think there is any reason to put a 6mm bullet in a larger case than this.

For all intents and purposes, the 280 is a 30-06. The 0.050" amounts to no meaningful difference. Obviously there are those here who disagree with your assertion as to how much case should be assigned to a 6mm bullet, otherwise, this thread wouldnt exist.

 

[Edds]

Obviously there are those here who disagree with your assertion as to how much case should be assigned to a 6mm bullet

I'd be interested in knowing how many of those that disagree have actually owned one. The only reason I used a case that big was because I had a long action and thought it would be a waste of the long action to use a 6mm Remington AI.

 

[88blazer]

For all intents and purposes, the 280 is a 30-06. The 0.050" amounts to no meaningful difference. Obviously there are those here who disagree with your assertion as to how much case should be assigned to a 6mm bullet, otherwise, this thread wouldnt exist.

LR, I could care less about the 280 and 06 stuff. But I do agree with your signature. Glocks do suck. I never leave home without my 1911!

 

[mclevela]

6mm \ 06 easy to do and should be 4300 t0 4400 with the 55 grainers. I shoot the 70 grainers at 4K. Would let you carry 5 in the mag.

 

[KYS]

Any news on the 6mmC4?

We actually changed the design and went back to the SAUM case. So this will basically be a 6mm4S. The little brother to the 6.5 4S that GAP developed. This was a collaboration with GAP and Copper Creek to come up with this speed demon. We are hoping for 3700-3800 with moderate pressures. We will see what happens. The stock is done, barrels are here, action is ready to go. Just waiting on the reamer to arrive!


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[LRJammer]

LR, I could care less about the 280 and 06 stuff. But I do agree with your signature. Glocks do suck. I never leave home without my 1911!

Just like American Express, "Dont leave home without it!"

 

[DirtyDave]

Orkan, did you end up deciding on a fast 6mm?

I shoot the 55gr NBT's out of my 6mm Remington. Never chrono'd the round but the Hodgdons load data says it should be over 4k fps. I know it's accurate and smokes the shit out of yotes, and that's what matters to me.
If you are looking to get 5 in the Mag, you may not want to go with a magnum based case. The smaller dia cases can easily get you over 4k.

6mm Rem
6mm Rem AI
6mm-06
6mm-06 AI

 

[bbcellars]

Thanks for the update. I was hoping someone would do a 6mm SAUM Good man KYS!

We actually changed the design and went back to the SAUM case. So this will basically be a 6mm4S. The little brother to the 6.5 4S that GAP developed. This was a collaboration with GAP and Copper Creek to come up with this speed demon. We are hoping for 3700-3800 with moderate pressures. We will see what happens. The stock is done, barrels are here, action is ready to go. Just waiting on the reamer to arrive!


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[knockemdown]

This is the .243Catbird, it is s 6-270 Imp35° Shown with 70NBtip

 

[orkan]

We've got something in the hopper. Need to test this summer before signing off on it.

 

[Jcub]

.244 H&H. H&H still chambers a rifle in it, iirc it's a .375 necked down to .243. I know you "don't care" about bbl life, but either way it's less than 400. I don't care what your intentions are, but less than 400 rounds won't last you a summer of shooting.

 

[PowerstrokeOBX]

That would only make it 2 days.

 

[tylerw02]

Yeah wouldn't have lasted me long on my last few trips. I think last trip I put 3,000 rounds through four barrels.


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[orkan]

.244 H&H. H&H still chambers a rifle in it, iirc it's a .375 necked down to .243. I know you "don't care" about bbl life, but either way it's less than 400. I don't care what your intentions are, but less than 400 rounds won't last you a summer of shooting.

Good thing this thread isn't about barrel life.

 

[Jcub]

You can actually read about it yourself. It has it's own wiki page. .244 H&H.