6MM what?

[spudgun]

I am looking for a new project this winter and have a Savage Axis in 308 win for a donor project.

I shoot 6.5 CM now and thinking of 6mm Creedmoor for my next project.

The reason I selected 6mm Cm, is I have 500 rnds of 6.5 Starline brass and could easily neck it down to 6mm. Thus saving on the cost of brass.

I also thought about 6X47, 6mm BR and others.

I DO NOT shoot competition, just looking for new challenge at 600 yds and beyond .


Any other calibers I might consider for 600 yds and beyond?

(I hope I didn't open up a can or worms here )

 

[Adam in WI]

Sounds like you have the practical choice nailed down.

If you want impractical, there's always 6mm-284. Your barrel is easy to change anyway.

 

[spudgun]

Sounds like you have the practical choice nailed down.

If you want impractical, there's always 6mm-284. Your barrel is easy to change anyway.

Adam, you shoot a Columbus?

 

[sawcarver]

6mm Dasher gets my vote. What you spend in brass will be offset by powder savings. Really any 6br variant but I love the Dasher

 

[Adam in WI]

Adam, you shoot a Columbus?

No sir, bit of a hike for me. Im up near Stevens Point.

 

[Terry]

Let's look at them...

6BR, by far the easiest, load and shoot. Easy to tune and a proven winner. 2800-2900 fps. common.

6 BRA /BRI, load and shoot to fire form, fire forming rounds good enough to shoot steel any day.
You gain an increase in velocity. 2900-3000 fps. common. This is a record setting round.

6 Dasher More records were set with this in the past 10 years than any other 6mm round.
Factory ready brass now available. 2950-3100 fps common.

6x47 Larger capacity, more powder, similar results. May feed easier in repeaters.

6 Creedmoor Larger capacity, more powder, similar results. May feed easier in repeaters.

If you shoot a magazine feed repeater and that's important, the 6x47 and 6 Creedmoor will feed better in most rifles.

 

[spudgun]

Let's look at them...

6BR, by far the easiest, load and shoot. Easy to tune and a proven winner. 2800-2900 fps. common.

6 BRA /BRI, load and shoot to fire form, fire forming rounds good enough to shoot steel any day.
You gain an increase in velocity. 2900-3000 fps. common. This is a record setting round.

6 Dasher More records were set with this in the past 10 years than any other 6mm round.
Factory ready brass now available. 2950-3100 fps common.

6x47 Larger capacity, more powder, similar results. May feed easier in repeaters.

6 Creedmoor Larger capacity, more powder, similar results. May feed easier in repeaters.

If you shoot a magazine feed repeater and that's important, the 6x47 and 6 Creedmoor will feed better in most rifles.

Thanks for the info Terry.

See you Saturday.

 

[spclark]

Any other calibers I might consider for 600 yds and beyond?

(I hope I didn't open up a can or worms here )

Well...

You hear about the venerable 7-08, and some tell tall tales about a 6-284 they built once.

A few years ago I stumbled onto a cartridge family designed by the esteemed forum member Robert Chombart using 308WIN brass necked down to 7mm and 6.5 mm. He tagged them the 284INCH and 260INCH respectively.

I built a 284INCH late in 2015 and after some anxious load development work in 2016 tied the then (Senior) NRA National Record for 1,000 yard Any Sight score of 200-15x with it in it's first competition appearance... with match sights too, not optics:



(David Tubb broke that record at Camp Atterbury in 2018 w/-16X. I have yet to learn whether he did it with match sights or with a 'scope.)

I've since wondered how something in a 6mm variant would work. Might be too close to 243WIN to offer much of an advantage for the modest increase - about 3mm - in case-to-shoulder dimension, the better to hold more propellant with modern 115 grain bullets.

 

[spudgun]

Well...

You hear about the venerable 7-08, and some tell tall tales about a 6-284 they built once.

A few years ago I stumbled onto a cartridge family designed by the esteemed forum member Robert Chombart using 308WIN brass necked down to 7mm and 6.5 mm. He tagged them the 284INCH and 260INCH respectively.

I built a 284INCH late in 2015 and after some anxious load development work in 2016 tied the then (Senior) NRA National Record for 1,000 yard Any Sight score of 200-15x with it in it's first competition appearance... with match sights too, not optics:

View attachment 1151898

(David Tubb broke that record at Camp Atterbury in 2018 w/-16X. I have yet to learn whether he did it with match sights or with a 'scope.)

I've since wondered how something in a 6mm variant would work. Might be too close to 243WIN to offer much of an advantage for the modest increase - about 3mm - in case-to-shoulder dimension, the better to hold more propellant with modern 115 grain bullets.

Before I got the 6.5mm, I thought of the 7-08.

The ballistics were close to the 6.5 CM. However a used 6.5CM showed up at my shop and the price was good so I bought it. It turned out to be a great shooting gun for the $400 price tag.

I will have to review the 7-08 again to see how it matches to the 6mm CM

Thanks for the remind...

 

[markgrabowski]

Well...

You hear about the venerable 7-08, and some tell tall tales about a 6-284 they built once.

A few years ago I stumbled onto a cartridge family designed by the esteemed forum member Robert Chombart using 308WIN brass necked down to 7mm and 6.5 mm. He tagged them the 284INCH and 260INCH respectively.

I built a 284INCH late in 2015 and after some anxious load development work in 2016 tied the then (Senior) NRA National Record for 1,000 yard Any Sight score of 200-15x with it in it's first competition appearance... with match sights too, not optics:

View attachment 1151898

(David Tubb broke that record at Camp Atterbury in 2018 w/-16X. I have yet to learn whether he did it with match sights or with a 'scope.)

I've since wondered how something in a 6mm variant would work. Might be too close to 243WIN to offer much of an advantage for the modest increase - about 3mm - in case-to-shoulder dimension, the better to hold more propellant with modern 115 grain bullets.

Yeah that 284inch is a far-out looking cartridge!

 

[sqrlgtr]

How bout a 6mm rem improved?That would be my choice only because I’ve got 200 pcs of the old 6mm rem.winchester brass that has never been opened,and I believe the axis action is long enough to handle the length of said cartridge..

 

[std7mag]

The Axis is a "standard" long action.
A spacer is used for short action magazines.
So the 6mm Rem will work.

Having said that, i'm a fan of the 7mm-08, and straight 284 Win.

You could alway neck your 6.5 Creed cases to 7mm. Kind of a 7mm-08AI short. Lol

I've done the 7mm-08 Imp 40,(AI). When i get another 7mm-08 i'll do it again, just because.

 

[coldboreshot]

Sounds like you have the practical choice nailed down.

If you want impractical, there's always 6mm-284. Your barrel is easy to change anyway.

And you will be doing it very frequently.

 

[coldboreshot]

I am looking for a new project this winter and have a Savage Axis in 308 win for a donor project.

I shoot 6.5 CM now and thinking of 6mm Creedmoor for my next project.

The reason I selected 6mm Cm, is I have 500 rnds of 6.5 Starline brass and could easily neck it down to 6mm. Thus saving on the cost of brass.

I also thought about 6X47, 6mm BR and others.

I DO NOT shoot competition, just looking for new challenge at 600 yds and beyond .


Any other calibers I might consider for 600 yds and beyond?

(I hope I didn't open up a can or worms here )

Go with the 6BR. It's very 600 yd capable and very easy to tune. You'll get a significant round count from the barrel before changing. I've seen more than enough 6BR's win overall in competitive 600 yd matches. During those heavy conditions days, it will teach you how to read and hold. There's more to accomplished shooting than buying bigger guns.

 

[Sniper338]

Once you shoot a 6BR or varient you wont give it up. Sweet shooting, VERY mild recoil.

6XC would be my second choice. It flat out shoots.