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Discussion Starter · #1 ·
Just wanted some input from you guys on this round. What has been your experience. Im looking to put together a nice chuck/coyote single shot rifle that can buck the wind and still be fairly flat shooting.

Thanks
 

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My thoughts are to go with a standard 25-'06, as I feel it is the smallest bore to still efficiently use that much powder space. I can't imagine a better 350 yard yote/chuck cartridge. If you really want a 6mm, go with the .243 or 6mm Remington. If want something customized specifically for L O N G range shooting, one of the better options out there is the 6.5/284, although that is just as over-bore as the 6mm-06.
 

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Because of what broom_jm is talking about, I think it needs at least 26 inches of barrel, and 28 inches would be better, in order to burn the powder charge and get all that it can offer, or else it is not worth the effort. I don't like carrying pole vaulting poles when I hunt, so I don't want one.

It will make the 6mm bullets go very fast, however, if you are willing to use a very long rifle and inefficient cartridge.
 

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The 6 mm/06 is a bit Overbored. Pressure would be awful high before you reached velocities in the 6 mm or .240 Weatherby Mag. I'd stick with the .25-06 or the .240 Weatherby Mag.
 

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look at the 240 weatherby ballistics and you will have just about the same round. they need long barrels to bring to make them shine. I have two different versions that use a blown out 25/06 case with 30 degree shoulders,a 240 weatherby,and two 6mm AI's. with heavy bullets and the right twist they are very effective. Barrel life isn't real long but they shoot very flat.
 

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Have a 6mm/284 - same thing as a 6mm-06, just shorter, fatter case.

It is wonderfully accurate and hustles a 100 gr Hornady Interlock along at a "moderate" 3390 fps with no signs of high pressure.

I'm sure the barrel throat life isn't that great (have logged 900 rounds fired to date with just normal wear signs as viewed with the Hawkeye bore scope), so had the gunsmith make the barrel as long as he could (27 3/8") so the chamber/throat could be recut at a later date.

This is a customized P-17 Enfield action. Rifle is a bit heavy, but would be a p'dog wonder if ever used for that purpose. It presently knocks whitetails DRT.
 

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Since you're talking about a single shot gun, why not the 6mm/30-40 AI. I'm putting together a Krag in the caliber, ought to be fun, got this Obermeyer barrel off gunbroker for $10....
 

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I'd sure be interested in the bullet weights that you want to shoot for this Wazz. If you want to shoot light bullets (55, 58 grs, or a bit heavier) then I'd probably just stick with a 243 Win. I have a 243 Win in the Rem 700 SPS and load the 58 gr Hornady V-max around 3800 fps. Deadly on chucks and yotes to 400 yards and beyond. "Bucking the wind" points to heavy-for-caliber bullets, where you might be able to utilize the extra velocity and range from the heavier bullets in the 6mm-06, compared to the 243 Win.

Not sure what your practiced range limit is, but I'd put the 243 Win with the 25-06 Rem in the same category for what is on your menu, with similar SD bullets.
 

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Discussion Starter · #11 ·
Thanks every one for your input. I do have a .243 Win that I use now for chucks and yote hunting. I was just curious about pushing that bullet to the max. Doesnt sound like that makes the most sence. Now I will start doing some research on the 25-06. Thanks again, that is why I enjoy using this site.
 

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How fast are you wanting to your 6mm bullets and what weight bullets are you wanting to shoot???

6mm-284: 1-14" twist rate / 3-groove / 30" barrel length / 80 gr. bullet / 4,200 fps....

6mm-284: 1-13" twist rate / 3-groove / 30" barrel length / 85 gr. bullet / 3,962 fps....

6mm-06: 1-8" twist rate / standard groove / 30" barrel / 105 gr. to 107 gr. bullet / 3,390 fps....

240 GIBBS: 1-10" twist rate / 4-groove / 30" barrel / 100 gr. bullet / 3,519 fps....

6mmX444 Improved: 1-10" twist rate / 3-groove / 27" barrel / 95 gr. bullet / 3,300 fps....

240 Weatherby Magnum: 1-13" twist rate / 3-groove / 30" barrel / 85 gr. bullet / 3,812 fps....

6mmX30-30 Improved: 1-15" twist rate / standard groove / 55 gr. bullet / 3,780 fps....

The listed velocities are not necessarily the fastest but they were the most accurate...

There is not a whole lot that that cannot be done with a good 6mm and an ACCURATE 6mm is a sight to behold - especially in the hands of a man that knows how to use it....

A
 

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I know several people that shoot 6mm-06 customs. Most of them shoot 105 gr high BC bullets. They shoot everything from deer, to coyotes. My fiance's relative just shot a coyote the other weekend at 620 yards with this round. These guys are a little above average shooters with many years of bench rest and custom rifle building experience though.

I have thought about building one, but have too many irons in the fire right now. Maybe someday down the road.
 

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I'm sure that some of you have seen my posts of shooting crows at 800 yards. The gun I used was a 1903-A3 rebarrelled to 6mm Ackley Improved Douglas Super Premium with a one in fourteen twist. Despite lots of folks arguing that it would not stabilize 100 grainers, I figured that the slower twist coupled with the higher powder capacity would equal a tack driver and I was correct because the slower twist allowed me to push those 100 grainers extremely fast. Rethroating was necessary after each 600 rounds or so, but it sure was worth it. So the question is; Is it going to be worth it?
 

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The 240 Gebby Super Varminter: We had three rifles built thirty years ago. Mine was on a 40X action with 30" Shilen barrel with 1:12 twist. The throat was cut with a custom reamer by Bill Pahmayer, a local gunsmith. We supplied dummy rounds. The idea was to use 75-85gr. bullets. The rifles proved to be heavy but extremely accurate. My standard load was a heavy charge of H4831 with 85gr. Sierra bullet @ 3700 fps. This load did not wreck brass etc. Cases could be made by necking down 270 brass. It was suggested using 240 Weatherby data to work up loads. This rifle was made up in the last days of the "bull gun" with long heavy barrel. All loads were chronographed on an Oehler 33. This information was gathered in 1982 and 1983. We learned quickly to work up loads and that not all published data was accurate or safe.
 

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I had a 240 Super Varminter also,I bought Jerry Gebbys after he passed away in Tucson.It was built on a pre war model 70.He had put in in a beautiful piece of walnut.The 240 SV is made off of the 270 Win case,and it will hum.This one would shoot groups in the .300 range.I let a friend have it that collects model 70's,and he has never fired it.I think if I ever build another 6mm this would be it.
 

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The 240 Gebby Super Varminter: We had three rifles built thirty years ago. Mine was on a 40X action with 30" Shilen barrel with 1:12 twist. The throat was cut with a custom reamer by Bill Pahmayer, a local gunsmith. We supplied dummy rounds. The idea was to use 75-85gr. bullets. The rifles proved to be heavy but extremely accurate. My standard load was a heavy charge of H4831 with 85gr. Sierra bullet @ 3700 fps. This load did not wreck brass etc. Cases could be made by necking down 270 brass. It was suggested using 240 Weatherby data to work up loads. This rifle was made up in the last days of the "bull gun" with long heavy barrel. All loads were chronographed on an Oehler 33. This information was gathered in 1982 and 1983. We learned quickly to work up loads and that not all published data was accurate or safe.


I think the 80's was good time for lot of different wildcats my choice was the 6x284. I want to take a 68gr Berger and do at least 4000fps. I had K&P build rifle on 700 action the K was Ken and he got his start making barrels at H&S.

I read an article back then about 240 Super Varminter get 4100fps with 75gr bullets. I used 1/14 twist barrel it was 28" long and I got to 4200fps and bullet held together and it was a hot load. I'd called Walt told him about his bullets and he had my address as I buy from him later got a 1K 68gr bullets from him told me have a good time and he hope bullet last the barrel life. I think that barrel lasted 850rds and I when thru few barrels then moved on to others.

My pet project today is the 243AI with 80gr @ 3700fps and that's not too bad using less than 50gr of powder. Since that first 6x284 I must of had 12/13 wildcat 6mm build and largest case was the 284 smallest was the 222mag.
 

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If you use a 1-14 rifling twist then you will not be over bore. I used the 244 Ackley Improved with 1-14 twist for Benchrest Competition and for 800 yard crow busting. Heavy for caliber bullets did exceptionally well in my gun, though there is no way of knowing how your barrel will act. My most accurate powder was RE-19. H4831SC was a super accurate powder but there is no loading information available that I know of. I experimented with it because of how well it performed in the 6.5 calibers for myself. Slower powders can turn in some amazing axccuracy with Hot Rod 6mms.
 
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