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 Cor Bon 6x45
gdblair  [Team Member]
3/15/2009 5:46:18 PM EST
Anyone have an impression on the Barnes 85gr TSX in the 6x45 prior to Cor Bon loading them?

They're a little pricey but I'm getting itchy to fill out a lower I have.
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Bearbait1  [Team Member]
3/16/2009 8:00:28 AM EST
GD,

I took an antelope 2 seasons ago with my 6x45 and the 85 TSX. Quartering angle on the critter, and my bullet cliped the hip meat, traversed both lungs and exited out the front. Shot was about 125 yards, and I could not have been more pleased with the bullet performance. Not sure I would pull the trigger on a 400 yard shot, but for my ranges I have a bunch loaded for hunting. My barrel is 24", and I am running them right around 2700 fps at the muzzle.

Craig
gdblair  [Team Member]
3/16/2009 9:42:22 AM EST
Thanks for the input Craig , I wanted to find some folks who had some experiance with them after seeing them listed on Cor Bon's site.

Cor Bon is listing them @2800 fps & 1480ft/lbs from a 16 inch bbl.

One other question: what is your twist rate? 1 in 10 decent for bullets around 80-90grs?


Bearbait1  [Team Member]
3/16/2009 3:53:33 PM EST
GD,

I do not remember off the top of my head what my twist is. I would probably have to measure it, as I do not remember specifying to Marty at Teppo Jutsu, the maker.

Holy crap, 2800 fps from a 16 inch barrel? I had some handloads with the TSX that were going 2850 from my 24" tube, but based on the Sierra Load data I figured I was way over the line. I was not seeing any pressure signs, but there is so little load data out there that I am being conservative. I may have to order some up, and check and see what I get in my barrel. If you are planning on loading to mag length (non-single shot), then you will not have many if any tipped bullets much more than the 85-90 grains that will work in the mag. Had I known this back when I had mine made, and based on what the 6.8 folks are doing, I would have really looked at twist more closely. I bet there might be some wiggle room to slow the twist down from where a .243 Winchester is set up, and you might gain a little giddy-up.

The accuracy of the 85TSX is a little less than what I get with the Sierra bullets, but still pretty decent. I'll take a look at my twist this evening when I get home, and report back.

Craig
gdblair  [Team Member]
3/16/2009 5:01:03 PM EST
The TSX they have loaded is the non-tipped.

Most of the info I see is that a 1-10 is generally used for the lighter spectrum and 1-8 for the heavier side.

Looking forward to seeing what you've got twist wise and hope the Cor Bon numbers aren't a typo.

GB

eta- ! UNDER THE "NEW FOR 2009" they list 3 other loads (2) 70grs @ 3000 fps /16in bbl and a "varmint grenade" 62 gr @3100fps/16in bbl.
I'm believing that this is no typo given that the larger diameter bullet can be driven faster at the same weight.(5.56 vs. 6 mm )
Bearbait1  [Team Member]
3/17/2009 8:36:54 AM EST
GD,

I just checked my barrel and it is indeed 1:10. I also checked some of the other listed twists in my Hodgdon manual for other 6mm rounds and there is quite a variety, 1-9 to 1:14. The 243 shows as 1:10.

I think the only way to fit a Tipped TSX into the 6x45 AR magazine would be for the bullet to be very light. I have the Varmint Grenade on my list of things to try out this spring, when the pasture poodles start rearing their fuzzy little heads. But in all honesty, the numbers that I have looked at don't show the 6mm being that much better than the 556 for varminting. Most of my shots tend to be under 400 yards, and prairie dogs don't need a whole lot of "stopping power". You can build a 556 rig designed to shoot heavier bullets that will run right along with the 6x45. I purchased mine years ago, before the 6.8 was so popular, to get me legal (.243) in Colorado for antelope. My hunting/GP platform for my AR is a switch barrel/caliber MGI affair, so I would still likely choose the 6x45 now, just for magazine compatability alone. And then there is the benefit of having lots of 556 brass on the shelf It sure is a lot more complicated these days choosing between Alternative AR calibers. But that is a good thing, and I am very pleased to see Cor-Bon loading for the 6x45.........

Craig
gdblair  [Team Member]
3/17/2009 10:33:57 AM EST
Craig,

Thanks again , I think your practical application on the antelope was the most illuminating for me. I'm considering this for some light deer at short
range .

I like the progress the SPC crowd is making and I may someday go that route.

My own personal endeavor is between the SPC and the 6x45 , based on a 17 rem case necked to 6.8, is on a back burner due to tightening
finances.Having reamers , dies , and barrels made up these days would be too frustrating.Maybe after I get a 6x45 set-up it'll make
forget all about my foolish pursuits!


GB
Bearbait1  [Team Member]
3/17/2009 11:42:40 AM EST
GD,

I am glad that you clarified about the hunting requirement. When I approached the Alternative AR path for hunting, the first thing I did was look at bullet choices. As you know by the 6.8 evolution, many times the choices of optimal projectiles do not exist for the caliber. You have to be very careful here on this Site to keep track of what folks are posting in terms of performance AND what the intended target is to be. While I mentioned that you can get heavy 556's to perform equally on paper with the 6x45, the heavy 556 bullets may leave you wanting for hunting applications.

It is a bit of the same song, second verse with the 6x45. The lighter 6mm bullets perform the best on paper in terms of velocity, case capacity, ballistics etc., but these bullets are typically designed around shooting varmints from a .243 Win. When I got my first box of 85 TSX's, I knew that this was going to be my hunting bullet, even if I had to give up a little accuracy. As it turns out, you may also give up some ballistic performance, as the length of the bullet WILL limit you on some powder choices, but for me that is also an easy trade-off. If the Cor-Bon numbers are correct, and I would suspect they are, then they have done what I have not been able to do up to this point. Oh to have the way to properly measure pressure at home.

The 6x45 sounds like it would make a fine caliber for your purposes. It is a snap to reload, the performance will easily handle your targets, and it is an easy round to shoot and reload if you decide to do so. I can easily see my shots, and the gun would be a snap for younger shooters or folks who don't feel like they need a lot of recoil to make their point. Sure the 6.8 and 6.5 will outperform the 6x45, but if you start from the target parameters and work backwards some interesting things shake out. And if the Barnes TSX bullets excite you when reloading, try picking up some Lapua 556 brass

Craig
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