6mm Rem vs 6mm Rem AI

[bobcat93]

OP, If you're going with a custom action and like flirting with high pressures / extreme velocity, you will be able to get close to 3900 with the 75 gr vmax and over 3600 with the 87 gr. I achieved both in very fast brux barrels a few years ago. 14 twist on the 75 gr and 12 twist on the 87.

Either way, get your

Damn!! Now that's fast!!

 

[B23]

A couple things. The Rem 6mm is a long-ish cartridge and really needs to be used in a long action to get the benefits from its case capacity. The brass that's available for the Rem 6mm is marginal at best and IMO not really worth the time and cost to blow the shoulder out and "improve" it. If you want more speed than a standard Rem 6mm provides, I'd skip the idea of a 6mm Ack Imp and go with a 6-284 instead. Necked down Lapua 6.5-284 brass lasts a very, very long time and is top notch stuff. Dies are easily available and it'll work better, particularly for that weight bullet, in a short action.

My 6-284 is built on a SA Rem 700 with a 12tw 26in barrel. I shoot the 75gr Vmax at 3650fps and that's a relatively mild-ish load.

I'm a Remington guy and I've always been a fan of the 6mm. My dad has shot a 22-6mm for years and years but like I mentioned above, brass quality as well as availability is marginal at best and unless you just have your heart set on one, I think there are better choices.

 

[AckleymanII]

I had pretty good luck with 6 and 6 AI cases along with 6/284 and 25/284. ALL are best on long actions. 25/284s were a POS on a short action, could not touch the lands with bullet on a new barrel.

ON a 10T 6 AI, zero freebore 26" Douglas barrel, I shot the 70g at 3980 fps. ON a 6 AI Shilen 14T, Zero Freebore, I shot the 70g at 4100 using either Win or Rem brass, 26". I shot Win 760 in both the above cases.

On my 6/284's, I shot IMR 4831 with 85g Sierra's at 3600 with a 28" barrrel. I was using Win 284 brass at the time.

As a coyote hunter, I lost brass all the time. Multiple coyotes were common and I did not want my attention span to change from picking up multiple animals to policing up brass.

Later on, I shot the 80g Sierra blitz bt at 3800 in the 14T zero freebore shilen 6 AI. Chucks looked like they had been shot out of a cannon at bullet impact. 6AI with 60g Sierra at 4400 exploded chucks like paint balls on a flat black rock.

Since I like to chase the lands, the 6 Rem, AI, 284 and variants all go on long actions for my likes...more harmonious outcome.

 

[js2013]

Big fan of the 6AI. Very accurate even with fire forming loads. 3200 FPS is super easy with 105’s. With 105/7’s a short action rem700 is a little short unless it’s used as a single shot.

 

[Racebannon3855]

I know this is off topic..but has anyone used this on deer in the woods. I never have only 30-30 and hand guns..
The 6mm rem is definitely a interesting cartridge to me..





Mine is a Ruger Tang Safety short action 27" 1:8 Pac-Nor running 115 gr Berger VLD Hunting. The overall cartridge length is longer than the book length for a 240 Weatherby. I am running just about 3200 fps and my best groups are around an inch at 250. After shooting a few deer with it I am very happy with the 115 VLD Hunter, always exits on chest cavity shots out past 400. It is a single shot, the magazine is not an option. I shot one 130# doe at a 100 and the bullet still exited, it did not make a terrible mess. All my other deer have past 300.
If I did it again it would be a long action. According to the Berger calculator if I push the 115 VLD Hunter much faster it could have issues. It makes a great hunting rig, but I think there are better choices. When this barrel kicks this short action rifle will become a 6 XC. I have another tang safety Ruger long action that will either become a 6 Rem AI or a 25-06 AI.

I posted that paragraph a while ago when somebody asked about a 6 AI rem.. I have faith in the folks at Sierra and their book talks about the 6 AI being the most improvement of any of the AI cartridges. In a barrel short enough to hunt the woods with, it might not gain you much. My bolt went out to Gre-Tan and they worked their magic on it so my primers hold up great and I could go faster than 3200. The Berger Calculator shows the Bullet getting wonky around 3250 so I quit with what I have. If you tried hard enough you could kill a barrel developing loads across multile barrel weights. My rifle only gets used from a tower blind or when I call coyotes, it is not a walk around proposition.

I have pursued a couple Remington 600/660 6 mm Reminton rifles for what you are looking into. If I could have tried dummy rounds in them to see what they would run through the magazine I might have bought one. A light rifle in a mild recoiling caliber running a partition would be perfect in hard hunting.

Mr. Ackley grew up in the county I live in so I felt like I owed it to him to get atleast one rifle chambered for an AI. Not sure I would do it again, but I have learned a bunch and created a good bit of venison in the process.

 

[bobcat93]

Racebannon3855
I'm sorry I didnt mean to interrupt the topic.
I suppose that was rude.
Please accept my apology

 

[Racebannon3855]

Racebannon3855
I'm sorry I didnt mean to interrupt the topic.
I suppose that was rude.
Please accept my apology

Sorry I implied that you messed up, not the intent. You asked a fair question and I must have gotten carried away answering it.