Which 6mm Wildcat? 6mm DTI or .243 LBC/Grendel

[jasonprox700]

I've been wanting to build a 6mm for coyote hunting. I'm trying to decide between the 6mm DTI or the .243 LBC/Grendel. I'm looking for which one will generate the most velocity. Thoughts?

[ICANHITHIMMAN]

I'm not going to vote as I dont know the specs on either round and I have a few more things for you to consider.

Speed is not the be all end all, energy on target is. I would decide on a bullet and a twist rate and have my barrel short throted so I can seat my bullets to mag length and use as much available powder space.

[jasonprox700]

I guess with the velocity part, with all things being equal (bullet weight, barrel length, twist) which of the 2 rounds listed will generate the highest velocity? I realize velocity isn't everything, but if I will be using the same bullet in which ever cartridge I choose, the round with the higher velocity will also generate more energy...

I don't have any experience with either of these two rounds, that is why I posted the question.

I would like to go with a 1:8 twist to stabilize heavier bullets (105gr A-Max), however, I would most likely be sticking with the 75 or 87gr V-Max for my hunting loads.

[The Wolverine]

If you want to shoot the 105 A-max, the 243 LBC is the only one of the two that will do it in a AR15 platform.

The 6DTI is a great wildcat, and Mike is a great builder, but the 6 DTI was not designed to shoot the long bullets, the case is too long. The 85-87 gr is about max you can fit, if memory serves.

When myself and a buddy designed the 243 LBC, we built it around shooting the long, high BC bullets. We wanted a 1000 yard gun in a AR15, and with the 105 A-max, it is supersonic past 1200 yards.

I also wanted to build a 1000 yard shooter that a common man could afford, and be easy to reload, with off the shelf dies. I learned my lesson with the 6.5 PCC, over 9 months, and still waiting on dies, DOH!!

As far as velocity, the 243LBC should be a little faster with the same bullet and barrel length. The 243LBC has more powder capacity than the 6DTI.

Paul

[ICANHITHIMMAN]

If you want to shoot the 105 A-max, the 243 LBC is the only one of the two that will do it in a AR15 platform.

The 6DTI is a great wildcat, and Mike is a great builder, but the 6 DTI was not designed to shoot the long bullets, the case is too long. The 85-87 gr is about max you can fit, if memory serves.

When myself and a buddy designed the 243 LBC, we built it around shooting the long, high BC bullets. We wanted a 1000 yard gun in a AR15, and with the 105 A-max, it is supersonic past 1200 yards.

I also wanted to build a 1000 yard shooter that a common man could afford, and be easy to reload, with off the shelf dies. I learned my lesson with the 6.5 PCC, over 9 months, and still waiting on dies, DOH!!

As far as velocity, the 243LBC should be a little faster with the same bullet and barrel length. The 243LBC has more powder capacity than the 6DTI.

Paul

With that I would say you have your awnser

[Grendelizer]

The 6mmAR, a 6mm wildcat based on the 6.5 Grendel, is another option you might try since it uses 65G brass and mags. Factory dies from Redding.

Link: http://www.6mmar.com

John

[lungbuster]

I had a 6mm DTI built for coyotes and love it. It shoots like a dream. I'm getting around 3,200 with 75gr Sierra

http://i264.photobucket.com/albums/ii195/beakbuster/DSC09955.jpg

http://i264.photobucket.com/albums/ii195/beakbuster/DSC09771-1.jpg

http://i264.photobucket.com/albums/ii195/beakbuster/DSC09776-1.jpg

http://i264.photobucket.com/albums/ii195/beakbuster/DSC09768.jpg

[DirectDrive]

I've been wanting to build a 6mm for coyote hunting. I'm trying to decide between the 6mm DTI or the .243 LBC/Grendel. I'm looking for which one will generate the most velocity. Thoughts?
I've been thinking about a 6mm AR as well....used to shoot 6mm Remington and I like those 1/4" pills.

As stated you may want to decide which class of bullets that you want to shoot....85 gr or 105 gr
The 6mm DTI is advertised as being built for the 85 gr class of bullets while the .243 LBC/6mmAR will handle the larger pills and down to 75 gr according to Whitley at his 6mmAR site.

The one I'm leaning toward is a 20" .243 LBC from Black Hole Weaponry (non-proprietary barrel). I think Whitley (6mmAR) wants to sell the entire upper.

Similar 6mm wildcats:

6mm DTI (6.8 SPC-based) (shoulder blown forward)
6mm WOA (full-length 6.8 case)
6x41 (AR Performance, shortened 2mm for the longer pills)

6mmAR (Grendel necked to 6mm) Whitley
.243LBC
6mm Turbo (shoulder blown forward) Whitley
6mm Turbo 40 (+ 40 degree shoulder) Whitley
6mm Rat

Ease of cartridge prep and reliable feeding are other things to look at.


http://img268.imageshack.us/img268/8127/arcartridgecapacity.jpg (http://imageshack.us/photo/my-images/268/arcartridgecapacity.jpg/)

[lungbuster]

If the OP is looking for a coyote build, it doesn't take a heavy bullet to take them down. For years I hunted with .22 cal bullets from 50 to 55gr.

85gr and up are overkill for a coyote however, they would be better long range choices.

Most of my kills have been from 150 yard and in. I'm letting my son shoot my .223 Ar and I had the 6mm DTI built for something different and to shoot a 70-80gr bullet.

[DirectDrive]

If the OP is looking for a coyote build, it doesn't take a heavy bullet to take them down. For years I hunted with .22 cal bullets from 50 to 55gr.

85gr and up are overkill for a coyote however, they would be better long range choices.

Most of my kills have been from 150 yard and in. I'm letting my son shoot my .223 Ar and I had the 6mm DTI built for something different and to shoot a 70-80gr bullet.
If you're calling them in you can take them down with a .22lr.
I was watching coyotes work a hillside the past few days at 300 - 400+ yards away from us. A 6mm would have been a fine choice for those conditions especially if it was windy. That seems to be their comfort zone out here in Central Oregon. Even when jumped they will often scoot to that range, then stop and look back.

I digress as the OP wants feedback on the Grendel-based and SPC-based 6mm's.

[yellowfin]

SPC brass will probably be more plentiful over the long run, from what I gather so far.

[The Wolverine]

"the .243 LBC/6mmAR will handle the larger pills and down to 75 gr according to Whitley at his 6mmAR site."

Actually the 243 LBC handles the 58 gr V-max just fine. One of Black Hole Weaponry Pro-staff has a 20'' barrel that is getting close to 3500 fps out of the 58gr V-max. The co-developer has a 24'' that is clocking over 3600fps with the 58gr V-max. Both barrels are getting 1/2 moa with them. That is 22-250 speeds.

BTW, the 58gr V-max is the best coyote stopper I have ever used. I have never had one take a single step with my 6x45 pushing it at 3200fps. The 243 LBC pushing it 300 to 400 fps faster, should be a coyotes worst nightmare.

I do not think there will ever be a problem getting Grendel brass, if there is, we have a lot bigger problems than brass availability.

[jasonprox700]

I was looking at going with the Black Hole Weaponry barrel if I go the LBC route and Dtech for the 6mmDTI.

Everyone is correct, most of my hunting will be done calling coyotes. .223 is just fine for that, but like one of the above posters said, when you start getting way out there, the wind starts playing with the .223's quite a bit. I'll most likely stick with the 75gr pills.

I don want to be able to use it for deer, so I'll want to use heavier bullets for that.