Nothing. Firing 5.56 in 6mm wouldn't hurt anything. I would not depend on the larger bore preventing chambering of 6mm in 5.56. It has happened with 300blk in 5.56 chambers...Quote:
Originally Posted by SideShow Bob
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Nothing. Firing 5.56 in 6mm wouldn't hurt anything. I would not depend on the larger bore preventing chambering of 6mm in 5.56. It has happened with 300blk in 5.56 chambers...Quote:
Originally Posted by SideShow Bob
Most of the bullets larger than 85 grains will shoot, but will not feed from a standard AR magazine. I have a C-products stainless mag that lets me get a few more thousands of overall length to shoot 87's.Quote:
Originally Posted by belizejet
I shoot mostly 85's in a 1:10 20" barrel AR. BTW the 60 grain HP's are outstanding in both velocity and accuracy. They seem to hit coyotes way harder than a 62 grain bullet from a 223.
Saw this thread the other night and stumbled across this today if you're still looking for a 6/223 barrel
http://forum.snipershide.com/options...rrel-dies.html
MarkCO....Ok, u opened a can of worms here with a 260x45....What kind of shoulder are you going to run on it? I looked into the 25x45 and the bullets just sucked, plus availability....Have you thought about taking a 6x45 and giving it a ackley shoulder? I got a virgin 6x45 tube we could play with...
I'm trying to track down a barrel now. Yipppeee
I settled on the 6.5 PCC. It has some support in reamers and dies, but no-one has really pushed it yet. The guys who have not liked it, IMHO were not using the best combinations of powder and bullets. Granted, it is an experiment for me and I might end up coming back to the 6x45. But my calcs tell me I can run the same bullet mass at about 150 faster than the 6x45. We will see if it bears out in reality.Quote:
Originally Posted by buckshotbarlow
With matches and projects, might not get it done until June or so...the 450 Corvette parts head out to Cerakote next week, then tuning.
What's the average life expectancy of one these barrels?
i run my 75gr vmaxs at about 2600fps. My 20" doesn't get shot a whole heck of a lot time anymore since my range is shutdown and in a cluster f*ck of status about reopening. I have about 250rds down range and I think that the life of the tube will be very high because of the low speeds. BHW is a poly3 grove barrel, so i'm not worried about the rifling wearing down...I'm thinking about giving this round an ackly treatment to get some more velocity and case capacity...might have to start looking for a new reamer.
Here's our other post, might want to have the mods do a merge...
https://www.ar-15.co/threads/46001-6mm-223
i guess the 6x45ackley is the same as the 6tcu...
http://www.6mmbr.websitetoolbox.com/post?id=1770476
well, now i found a reamer...
http://www.z-hat.com/ReamerList.htm
soooo...it looks like u just get a 223AI redding type s bushing die, swap out a 6mm set and your gtg. Outside of a few fps gained, you would have an easy way to see the difference between a 223 and a 6x45AI. Other issues I saw was jump if you got the tcu route since it's throat is longer to support the bigger poison pills...
looks like here are some dies...http://www.ch4d.com/products/dies/caliber-list?page=3
brought the older post to the top...with this post...
https://www.ar-15.co/images/icons/icon1.png
i guess the 6x45ackley is the same as the 6tcu...
http://www.6mmbr.websitetoolbox.com/post?id=1770476
Is there really any significant gain in the AI for the 6mmx45? I would imagine you have to start with a new barrel as reaming an existing barrel would call for shortening the barrel at the extension and would be problematic for the gas tube length. I would love to collect some data for comparison. From an efficiency standpoint I already find the 6mm x 45 to be a rockstar.
In theory, you pull off the extensions, run the reamer and reattach the extension. You're not shortening anything, headspace stays "almost" the same as a regular 223. Here's a reference on the change.
http://www.accurateshooter.com/cartridge-guides/223rem/
Taken from the link..."This is because the overall geometry doesn’t change very dramatically other than the shoulder angle. You’re not blowing the shoulder forward into the neck."
Also, you increase the case volume around 7-8%, you get appx 100-140 fps more......All the more for a faster shooter, also looking at doing a switch barrel with my 223 savage.
I have an email into bert, i think he might kick my ass over this.
I think I would like to try this on the 24" BHW barrel. Let me know if you set this up, perhaps I could piggy back the effort.
i know someone who was very very naughty today....
Oo oo who was it?Quote:
Originally Posted by buckshotbarlow
I guess Bert will find out...Quote:
Originally Posted by hghclsswhitetrsh
We're in action,hghclsswhitetrsh just put an order in. I'm going to break down my ar's when his stuff arrives and we're going to meet at Berts. This is gonna be fun...Quote:
Originally Posted by IceAxe
Ok, hmmmm so do I do one 6mm x45 or all four of them? A concern for me is I have a substantial amount of 6mmx45 loaded. I recognize we have to fire form the cases but how much will firing the non AI rounds effect accuracy from an AI chamber? Concern is over my pet loads.
Count me in for at least one barrel to be reamed.
Fireformed rounds are actually pretty damn accurate. You will not loose accuracy with fire forming. I'm 100% in on all guns going to the 6x45AI, don't want to deal with any issues of the wrong ammo in the the wrong gun.
i might get some of these for fire forming...
http://www.grafs.com/retail/catalog/product/productId/26941
or
http://www.midwayusa.com/product/939...ProductFinding
^^^ This. I don't have a 6mm-223. But...... I do have a 6.5 Grendle. I fireform brass out of 7.62 x 39 brass and have the same results as factory brass.Quote:
Originally Posted by buckshotbarlow
We'll I may do as many as three but the conservative side of me will probably hold one out. Let me know when we can drop these barrels off as I will have to drive up from the Springs.
I don't see the Grendel as much of a delta on fire forming. I run the 7.62 x 39 cases through a 264 LBC, RCBS die and they are dimensionally similar to the Grendel brass from Hornady and Lapua. With the exception of the primer pocket of course. The 7.62 x 39 has about .015 more taper at the shoulder before firing than factory dimension .
my problem with this whole thing is now i'm on armslist/gunbroker/everywhere else looking for a used action. I found a savage on AL, if one of u all beat me 2 it...no problem. I just can't justify ripping my model12bvss apart. It's a micky mouse gun at 200yds...
Quote:
Originally Posted by buckshotbarlow
Don't forget the Stevens 200 action is the same as well. You can still find these new (complete rifles) for under $280
From what I've been able to research, you do shorten the barrel 1 thread.Quote:
Originally Posted by buckshotbarlow
http://www.ar15.com/archive/topic.html?b=3&f=4&t=304939
I also talked with Earl Hickman at Hickman Rifles here in the Springs and he confirmed the process requires 1thread removal. Also different go nogo gauges.
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Dropped off my parts at Bert's today. Hopefully have an assembled upper in a month. [UZI]
Now to find dies for the 6x45ai.
Any progress?
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None, not even sure when it will be started. Still waiting on a progress update. I think I'm gonna go with the 6mm tcu however. I am struggling trying to find the dies for the AI.
It would've been awesome to have the 6mm to shoot p dogs Saturday, it was windy as hell.
Update from a few months ago on my 6mmx45 build. I bought an 18" target crowned match barrel from Black Hole Weaponry and built my upper. I loaded up a variety of cartridges and found that the heavier bullets do not shoot well. I get sub 1"groups at 100 yards with 70grn Nosler BT's and 65grn Hornady varmiter. When I loaded up the 85 grn hornady inter bonds they went to like 7" groups. It's a 1:10 twist barrel. I really want to try some 75-80 grn but all I can find is super bookoo bucks Barnes TTSX 80grn.
I have had pretty good luck working up loads based upon barrel time nodes. I would be happy to help you work up a load. I have to fly
to Michigan tomorrow but if you can tell me what powder(s) you plan to use, I can run them through QuickLoad with your referenced bullet and and target a useable node for your 18 inch barrel.
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Belizejet, you may also want to try the Remington 80 grain PSP, they have them at Specialty Sports for a little over $20 for hundred round green bag.
Anyone have a recommendation for a gun smith to profile a 6mm tube? Didn't work out with Bp.
You might try Hickman Rifles here in the Springs, Earl has been my go to man for all my smithing.
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Hi Guys,
I had a bunch of shit hit the fan with work and my guns, but i'm back now. I got my 6x45 cooking with 3k fps on the loads I posted. I'm averaging 3008fps with the 75gr vmax out of my 20". I'm looking at the numbers and the amount of work and I don't think it's really worth going to the AI after i blew up an upper. SO here's some of the problems I had...BHW barrel was marginally pinned to the barrel extension. When I tried taking the barrel off, the extension moved, not the barrel...O.O....I took the upper into BT and we pulled the barrel off (thanks) then sent into BHW. I got the new barrel last week. I sighted it in yesterday and was very pleased with the results. I don't know why, but everything was right on the money...Only took me 4 rounds to zero the scope. So here's what I'm seeing on my 2 different builds:
20" BHW SS 1x9 tube = 3008fps
16" BHW SS 1x9 tube = 2850fps
Bullet is the hornaday vmax 75gr...http://www.hornady.com/store/6mm-.243-75-gr-V-MAX/
Powder is listed somewhere on the thread here...I can't remember which thread. (8208, 26grs)
cci 400 primers
Groups are .75" at 100yd on a windy day (yesterday was windy), .5" on a good day w/no wind.
The AI was an interesting concept, to gain a couple 100fps more was very very tasty, but after seeing what this did yesterday, i'm dropping that idea. Widners had a huge sale on some sierra 70gr blitzkings, but they're sold out now. I picked up 1k of those for my 16" for blaster rounds.
Going forward....I'm going to get some 87's and run those now that I have the faster twist barrel...but I really think that the 75gr vmax hit's the magic point for my guns. Cannot wait to get my coyotes with em this year...first snow is today!!!
Attachment 53685Attachment 53687I too picked up some of the 70 grain Bltzking's, the ones I got were moly coated. I ran the numbers with Quickload to calculate the barrel time and here is what I got.
Just started working with Barrel Times ; what barrel length are you running?