6 arc or 6x45 build

[rich44]

I would like to build a rifle for hunting coyote and whitetail deer.
I have a 8 twist 6mm barrel its like a #4 or 5 contour a McMillan rem hunter stock and a Bighorn Origin action with a 223 boltface.
I already have 6br 6mmAI and a 6x284 so I'd like something smaller, I also have a good supply of unfired LC brass so I was originally thinking 6x45 but now have this 6arc idea stuck in my head
And now can't decide and looking for insight.
Thanks

 

[3Ackleys]

Would have to have the bolt face opened up for the ARC. Also I would source some ammo/brass/dies before building the ARC.

 

[ebb]

Sounds like the 6-45 was made or you, why ponder the question any longer?

 

[Scott haywood]

I’ve chambered a couple of my old 13.5 twist benchrest barrels in 6x45 for a buddy. He loves it. He took a few deer and some hogs with it and is sold! Basically stock Rem 700 and he shoots 1/2” groups with 68 Gr BT’s all day long!

 

[Andy Legg]

My son loves his 6x45 20" AR. Shoots up to 87 grain mag lenght ammo or 105 grain's(@ 2640fps) when loaded long(single fed).

shoots great out to 600 yards....can't wait to get it out to 1000.

 

[22vartarg]

Getting one of my Cooper rifles re-barreled in 6x45. Brass is still plentiful and fairly easy to come by. Standard 223 powders should work and from what I’ve heard fairly easy to tune. I plan on shooting the lighter bullets from 55 to 75 grains

 

[EOD Rob]

Sounds like the 6-45 was made or you, why ponder the question any longer?

I have both, but I'm with ebb on this one. You already have everything you need for the 6x45. Its a great and accurate round that is more then enough to do what you want it to do. I also have the ARC (and love it), but why go the extra steps and spend the extra money for no reason. Or, you could do what I try to always do and build both! LOL That way you know you get what you want! lol

 

[rockrat]

I will throw a wrench into this discussion.

There is also the 6mm TCU. Think 6 x 45 Ackley improved.

 

[jpx2rk]

What would be some good bullets for white tail deer in the 6x45 to try and locate??

 

[stacy]

YES THEY ARE I SHOOT ONE 27'' HART BARREL 8TWIST 75GR V-MAX MAKES BUGHOLES AND 85GR BTHP (1530) SIERRA'S IS MY DEER BULLETS SHES BAD TO 300YDS ON DEER

I will throw a wrench into this discussion.

There is also the 6mm TCU. Think 6 x 45 Ackley improve

 

[EOD Rob]

Also, all my 6x45 is from military once fired LC brass and I have no issues with it!

I will throw a wrench into this discussion.

There is also the 6mm TCU. Think 6 x 45 Ackley improved.

I will throw a wrench into this discussion.

There is also the 6mm TCU. Think 6 x 45 Ackley improved.

Not a bad option rockrat!!!

 

[Oso]

As RockRat mentioned ... 6TCU, which is basically a 6x45AI. You pick up some additional case capacity/velocity. I designed a 6x45AI, because I just wasn't aware of the 6TCU so basically recreated the wheel. Aside from performance and no more case trimming, I like the AI/TCU for the added benefit of Case differentiation so no one can accidentally confuse it with a standard 223 Rem or 5.56 cartridge.

TCU/AI case forming is identical to fire-forming method for 223AI. The only difference is you need to neck up (expand) new brass from 223 to 6mm (expander mandrel die).

 

[AckleymanII]

6/204- 85g partitions on deer and hogs. This case is like a magnum 222 magnum.

Speed is beyond belief and bug hole accuracy.

204 ruger full Length and neck bushing sizers with appropriate x bushings, open up a Forster or Redding sleeve on their comp seaters....done.

I am shooting the 22 cal version 69g Sierra MK at 3385---CFE half inch groups.

3150 fps is single bug hole groups-8208. Equate these numbers to 64 g Winchesters and 65g sierras. No flies on 63g sierra's on deer and hogs. I am shooting a nine twist.

 

[swd]

What would be some good bullets for white tail deer in the 6x45 to try and locate??

95gr Partitions work great on deer out my 6x45

 

[Twdmar]

Isn't there a 24 nosler based on the 22 nosler necked up? No bolt face issue.

 

[Raptor]

I just built an ARC in Jan and was lucky enough to find some Grendel brass and made my own brass for the ARC. I had a few issues at first with pressure because I was running a can. Once I got it figured out all I can say is these damn things shoot like a bolt gun!! With 87s I shot mine out to 800yds for 3 shot groups to get some data and all the groups were .5 MOA or under to 800yds!! I also pulled some of the factory 105s and put 95 Bergers in them and they are shooting 5 shots into .5s.....

 

[ImBIllT]

The obvious answer is 6TCU.

 

[Oso]

I have had time to ponder this question since building my 6x45AI. I was limited by the bolt face so a 6mm Grendel was not an option.

The 223AI case and 204 Ruger case are close on powder volume. If you go straight 204 case (neck-up to 6mm) then no fire forming. If you go with a 6TCU then never a concern for brass (cheap and readily available).

If you want more velocity for heavier bullets and longer distances then the 6mmAR / 6mm Grendel / 6 ARC is the way to go. Sourcing brass same challenge as for 204 Ruger brass.

 

[rich44]

I didn't even consider the 6-204 and since I have a 204 R and a 17-204 and a decent supply of new 204 brass that may be the way to go.
The main reason I even considered the 6arc was the possibility of factory ammo but that looks pretty much nonexistent.

 

[457ciSBC]

I didn't even consider the 6-204 and since I have a 204 R and a 17-204 and a decent supply of new 204 brass that may be the way to go.

That’s the easy button right there for you.