Home Forums Reloading Varmint Rifles want to build a coyote round for an AR

I want a real thumper teh 6x45 peaked my interest so then I stared looking around and ran accross the 25 copperhead the 25-204 and so on

So I like 25s plus I would feel comfortable doubling as a deer round for grins.

Never been a 6mm fan but then again I was never into black guns either

I dont want a 223

I want easy forming brass with little neck prep just maybe some length trimming

I also saw where a guy has some wildcats based off of the spc case but that seems like a lots of necking down and thick necks

I also would like point and shoot to 200 which I think is do able in the 6x45

what say you

I have never had a 6x45 in an AR but I have had a couple speciality pistols over the years chambered for the 6x45. The first was a Custom Remington XP-100 Bolt Action Handgun with a 16" Barrel. That was a joy to shoot, amazingly accurate and would shoot 60gr. Sierra Hollow Points, 70gr. Hornady Spire Points and 80gr. Speer Hot Core Spitzers to the same point of impact at 100 yards. I shot some varmints and a whitetail or two with it but in the end it was heavier than I wanted so I sold it and replaced it with a T/C Contender.

The T/C Contender wore a 15" Bullberry Barrel and also was a joy to shoot. One day I shot 5 rounds loaded with 60gr. Sierra Hollow Points, 5 rounds loaded with 70gr. Hornady SX and 5 rounds loaded with 80gr. Speer Hot Core Spitzers into a single group measuring just over an inch.

Muzzle velocity with the 60's was 2950 FPS and 2650 FPS for the 80's.

I too have often thought about a 6x45 AR Upper Receiver Assembly. I think it would make a dandy Coyote AR, and be useable for Deer also at reasonable range.

Larry

Check out Carey Custom Rifles: Link-Click Here

They do the following "interesting" AR's, including the 6x45:

AR15 platform rifle work.
We are a Rock River Arms Premier Dealer and primarily use RRA and Stag parts to build a rifle. We can build a match grade varmint rifle from the right parts almost as economically as we can from a kit that only offers a certain number of options.
List of available calibers we chamber AR 15's for.
* for the recommended calibers

17 TAC
17 Rem
17-223*
20 TAC*
204 Ruger
223 Rem*
6X45
6mm WOA*
6.5 LBC*

The 6.5 LBC is the same as the Grendel with cheaper dies and brass and cheaper to build.

I'd say do it...

I've got 2 of them, one bolt and one AR.

Your wants mirrored mine and I decided on the 6x45.

A .25-204 or a 6mm-204 would get you even more...

What bullets are you gunning in .243" AR mag constraints?

I'd be in 243WIN AR-10 Mode with 105's,if forced to slum a 6mm Black Gun itch.................

That new 30 Remington AR opens a lot of possibilities. It has to be very close to a 300 Savage in capacity, which means a 22 version would be right close to 22/250. I cannot think of a better coyote cartridge than that!

Some guys are having good luck with the WSSM's out of the AR's. I have 1-243 but have yet to load up once-fired brass for it. Soon i hope.

I have given some serious thought to the 6.5 LBC using some of the Lapua brass. The new 123 A-Max was built for the 6.5 LBC with Les Baer's input. Decent enough BC too. Oughtta' get u out there aways. AR-15 platform is lighter than AR-10 too--a plus for those heavy rigs.

That being said my buddy's DPMS AR-10 243 accounted for 3 long-range 1st-shots last year on coyotes--785, 650, 535 and 1 470-yder. that took a couple shots since we couldn't determine range. Used 1 of the greatest factory-type long-range bullets ever designed for just this purpose--the Horn. 87 V-Max.

If I was doing an AR and wanted more punch, then I'd be looking at the Rem BR case..

pick you bore favorite..

20 BR, 22BR, 6BR, 25 BR

for the 20 cal, I keep thinking either 20 BR or 20/250....

I don't think that you could get a BR case to feed reliably. They are difficult to make feed reliably from the magazine in a bolt gun, and I believe that the problem would be even worse with an AR type magazine.



drover

I had a WSSM once, I won't ever do that again! If you only buy factory and only go through a box or two a year, it would be good for coyotes (I do not fit that description). Brass is not that good for handloading.

Well here is what I have come u with

6x45 is still out front my love affair with 25s cant overcome teh variety of bullets available for the 6mm

then there is the 25-223 I really like what this has to offer however there is not the same following or support group for this round if I need help also being green to ARs my confidence is not there building this when I can get a complete upper in 6x45

Last is the 25 dti the 6.8 spc necked down to 257 I think I may choose this for a future build once I learn more about these guns

What do you guys think

The 6X45 doesn't have the powder capacity to push the current 6mm bullets fast enough for proper expansion. Yes, I know many animals are killed every day with it. The same could be said of the 22 rimfire.

25 cal bullets, they are made for the current production rifles which are the 25-06 and the 257 Weatherby. Do you really expect them to perform at half the velocity of a Weatherby.

The wake up call can be seen in the classified sections, where there is a disproportionate amount of the super wildcats, mismatched with the AR 15 rifles for sale by dissatisfied customers.

The first thing one needs to consider is what bullet you want to shoot at what animal, then what speed that bullet was designed to work properly at. After you have that worked out, find the case size that will propel the bullet to its working velocity range. Another thing to consider is the trajectory, do you want it to look like a rainbow (300 Whisper), or a laser (204 Ruger).

Seems we are now doing things backwards. Starting with what will fit in the magazine of an AR 15. The guys pushing wildcat cartridges are not doing the consumers any favors if they won't work properly.

I remain curious:

What bullets are you gunning in .243" AR mag constraints?

I'd be in 243WIN AR-10 Mode with 105's,if forced to slum a 6mm Black Gun itch.................

I seem to remember D Tech saying on another forum that he has the reamer for a .25 DTI based off of his improved 6.8 SPC Cased 6mm DTI. You might want to give D Tech a call.

Several years back I had a SSK Contender Handgun (14" Barrel) chambered in .250 Savage. I shot 75gr. Hornady Hollow Points at 2975 FPS and 100gr. Nosler Ballistic Tips at 2600 FPS with excellent results. However it wasn't a super long range proposition.

I would think that in a 20" AR the .25 DTI would be able to achieve those velocities.

Larry

No trick to eek a better BC,ala 75BTHP in a straight up 223 at 2750fps,with a whole bunch less dicking around.

Win/win................

Why not a 6.5 Grendel, factory brass from Lapua, and Hornady, factory dies. I easily get 2800+ fps from with a 90 gr. Speer TNT. It hammers yotes. Unless you just want to play with something different, I would go either the 223 route with a 69 to 75 gr. bullet or the 6.5 Grendel. Like big stick said both are a lot less dicking around.

PaPa260

personally I would follow your gut and go with the 6x45.
the bullet selection available is perfect for that project, and would be just fine for deer as long as you're not trying to pop them way out there. an 85 grain partition would be my choice for deer if it groups well.
I used 55gr BT's in my 6x45 for everything else.

I'm shooting 6x45, 22-204, 6mm-204 and 25-204 all in bolt guns. I think you find that the 6mm and 25- 204 are going to be too long for an AR with 85 to 100gr bullets (I'm loading them to 2.410 and wish I could seat them out a little farther) even 55 and 62 gr Lead Frees eat up alot of space. As for 6mm and 25 cal bullets not being pushed fast enough to be effective, BS, 85gr partitions in the 6mm work just fine and 90gr SGK's and 100gr Partitions running 3000fps and 2800fps work just fine.

erich

Hey Stick...

I'm running 75 grain Sierra HP's and Vmax's...

TAC and 2015...

Eeking out performance and/or loss of same in the Ar-15 platform and the COAL limitations vs. an AR-10 platform was not and is not a consideration.

It's nothing but a fur stacking killing gun. No more no less. And it does this very well.

I have a 6x45 and my go to coyote loads are a 65vmax in front of AA2015 @ 3000fps, the same load for Noslers 70gr BT @ about 2800-2900 fps.
I have taken 2 hang up dogs to 367 yards with the 65vm with no problem at all.
It turned their lungs to soup.
I also use a sierra 85g GK HP for Antelope, shot my 1st one at 225yds, dropped on the spot as well.
I have no problem hitting steel at 500 yds with all the above loads at the local range. 300yds ain't nothing for the 6x45. Don't believe any of the BS about bullets not expanding at 6x45 speeds...total BS