6mm mach 4 load data

[matthias]

i have acquired all the parts for a 6mm mach 4 rifle and i am currently waiting on the re




i am looking for load data . i have read the article from single actions . com looking for more and my google fu is weak . thank you all for reading

 

[Zero333]

With 500 - 750 rounds of accurate barrel life, I'm not surprised there aren't many who use it.

6mm Mach IV = 7mm RemMag necked down to 6mm
6mm Arnold = .264 WinMag necked to 6mm
6mm Atlas = 338 WinMag neckd to 6mm

Quickload has the 6mm Arnold and 6mm Atlas in the database.

If you wanna tell me what bullet and powder you wanna use I can tell you what Quickload calculated.

According to QL, the 6mm-Atlas can reach up to 3,550 fps with 105 grainers in a 30" tube with out exceeding 63,000 psi.

And 4,100 fps with 70 grainers.

 

[rcw3]

Sounds like a bullet drag race - - velocity for the sake of velocity - - what's the point?

Am I missing something here?

 

[1lnbrdg]

Just looking for low earth orbit I think . . . . .

 

[matthias]

looking for 107 sierra with h1000

main reason for this is a point and shoot coyote rifle.

 

[PA Jeep]

I did something similar many years ago with a 6mm/300 Dakota. I was a few decades ahead of the beltless magnum evolution. I used the 300 Dakota to get a nice long neck not to run from a belt. All I can say is 5 barrels lasted me less than 3200 rounds. Big expense with very limited barrel life. But boy it sure did go fast.

 

[swd]

Does it kill coyotes with the bullet or the part of the barrel it washes out with every shot?

 

[matthias]

I really don't care what part kills them either the bullet or the barrel pieces . really wanting to build and have fun With it. I have two barrels ready to go and I am going to order another when I get shooting.

 

[swd]

It should be spectacular while it lasts. Wind what wind!

 

[matthias]

wind ? we dont need no stinking wind!

 

[Zero333]

QL data for the 6mm Atlas (338winmag neck to 6mm)

3.340" coal
107 smk
H-1000

26" barrel
68gr = 3,350 fps, 62,000 psi

30" barrel
68gr = 3,475 fps

Start lower, work up bla bla bla

6mm Arnold (.264winmag neck to 6mm) reached 61,500psi with 66gr of H-1000

Some actions with the right brass will work up to 65,000 psi with out showing pressure, so you have to run a ladder to find out what's safe with your components.

 

[matthias]

thank you . i will do a write up as i bbq the barrel

 

[Zero333]

Hope those 107's don't disappear in a puff of lead soon after leaving the muzzle.

 

[matthias]

Yeah they might. May have to go with something g else if problems show up

 

[swd]

Go with a 5R barrel to be a little easier on the jackets.

 

[matthias]

i actually got a 3 groove 12 twist pacnor barrel one is 32 " the other is 26" maybe they will work out.

 

[rickiesrevenge]

Interested to see what you get out of this build. Do you think the 12T will be fast enough for those heavy pills?

Aaron

 

[swd]

I've shot lot's of 107 Sierra's, a 12 won't stabilize them. Even the 95 SMK needs a 9. The 87 V Max would probably stabilize but that's an awful big case for a bullet that light. You'd be going backwards in efficiency and BC. You might consider selling or trading those 12"s in for an 8".

 

[matthias]

Swd - how fast have you run them? The Sierra tec I talked with was fairly confident it would work. I am willing to try and if it doesn't work I will use the second barrel for something more reasonable.

 

[swd]

I'm down around 3000. If the Sierra tech says they'll work go with it, don't pay any attention to me!