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I am thinking of putting a rifle together based off the .243 Winchester case. Something lighter recoiling than my 6.5-284 and a true short action round. Two that intrigue me are the 6mm Competition Match and the Super LR.

Anyone have any experiences with either of these or any other match-inspired 6mm wildcats?

Thanks


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6XC - based on the 22-250 instead of the 243. It's slightly shorter than 243-based wildcats, and therefore able to take advantage of the longer 105gr+ bullets without concern for COAL in a BDL/ADL internal box. It's inherently accurate as well, and was developed by David Tubb primarily for XTC competitions. I've had a number of 6mm wildcats, and it remains in my stable while the others have been sent down the road for various reasons.

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For killing a 243 ackley is fun


Ran 85g Barnes at 3400 plus. It was a bad sob.

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Originally Posted by darrenk75b
6XC - based on the 22-250 instead of the 243. It's slightly shorter than 243-based wildcats, and therefore able to take advantage of the longer 105gr+ bullets without concern for COAL in a BDL/ADL internal box. It's inherently accurate as well, and was developed by David Tubb primarily for XTC competitions. I've had a number of 6mm wildcats, and it remains in my stable while the others have been sent down the road for various reasons.


Gonna be a single shot and I don't want the 6XC- brass is very hard to find at most times.


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I saw a European rifle yesterdY stamped .243 NOSLER. I don't have a clue what that animal is!

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Not what you are asking about but if it is a single shot a 6-284 is a monster.

I have 3, a re-chambered 243 Montana, a Kreiger 12 twist on a 700, and a Stiller 10 twist Lilja.

They are fast and very accurate.

Necking down 6.5-284 brass in a single pass and Lapua makes brass.

70 grain Blitzkings and BT;s at 3800+ have to be seen to be believed and 100's at 3400 work very well on deer and antelope.
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I have have several 6-284's and the case is just too large PLUS it isn't based on the 243.
I like the Ackley if you want to shoot factory, when necessary. The 6-47 L isn't based on the 243 but is easy to get to shoot really well provided the rifle is good.
The 6 SLR can have shoulder issues with Lapua cases.
The 6 Creedmoor is great but not strictly on the 243.
I would go Ackley or get a 6 on the Lapua or Creedmoor case.



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Dennis, since you are talking single shot, options are many.

With the politics of today, importation of brass could stop as we learned in the mid 80's with Sako brass.

So, any case that is based on a 22/250 or 243 case would work well for you.

A custom 243 may sound boring, but they are Extremely accurate, and as a hunter the AI has no down side.

Some years ago, I built two custom 6/250 AI's and the speed with the 70's was at 3800 out of a 28" barrel with win 760, with match accuracy. If you look at the design on the 6/250 AI, it is very similar to some of the new cartridges.

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There is also the 6mmBR-K

A 6BR reamer is used to go deeper to headspace as a 243.
I did the same concept with a 30BR reamer and headspaced it as a 308. Improved shoulder from 20 degrees to 30 degrees with less body taper.

From Accurate Shooter website:


Hot .243-Based Wildcats — The .243 BR-K and 6mm Super X

Gunsmith Mike Sosenko and long-time AccurateShooter Forum member John Adams have been using a modified .243 Winchester case with great success in Varmint Silhouette matches at the Pala Range in Southern California. Officially called the “.243 BR-K” (and informally dubbed the “6BR Long”), the wildcat is basically a .243 Winchester with less body taper and a 30-degree shoulder. The design essentially grafts a 6mmBR Norma “top end” to the .243 Winchester case. After fire-forming, Mike and John can reload this case using normal, unmodified 6BR neck-sizing and seater dies.

Compared to a .243 Winchester, the .243 BR-K’s body length is about .006″ longer, and the shoulder is about .0055″ wider. The main difference is the shoulder angle (30° vs. 20°), and the location of the neck-shoulder junction (“NSJ”). Based on reamer prints, the base to NSJ dimension is 1.718″ on the 6BR Long, compared to 1.804″ for the .243 Winchester. Neck length is a bit shorter because “the neck shrinks a little when the shoulder blows out” according to Sosenko. Check with Dave Kiff of Pacific Tool & Gauge for exact dimensions. Dave created the reamers for both the 6mm and 22-caliber versions of this wildcat. Ask for the “22 BR-K” or “.243 BR-K” reamer designs

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That seems like a lot of work and expense to go through in order to say you are not shooting a 243 AI.

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Originally Posted by keith
That seems like a lot of work and expense to go through in order to say you are not shooting a 243 AI.


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Im playing with a 6.5 SLR for 1000 yard BR right now.
The problem....ie the problem for me is the 6mms are hard on barrels.A 243 or a case close to a 243 in 6mm is tons of fun.But require more tuning and time than I care for.
Now you take a 6.5 at the size of a 243 case.... say a 260 and 2000 rounds of decent accuracy can be had.
http://www.6mmar.com/65_SuperLR.php
dave


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Originally Posted by dave7mm
Im playing with a 6.5 SLR for 1000 yard BR right now.
The problem....ie the problem for me is the 6mms are hard on barrels.A 243 or a case close to a 243 in 6mm is tons of fun.But require more tuning and time than I care for.
Now you take a 6.5 at the size of a 243 case.... say a 260 and 2000 rounds of decent accuracy can be had.
http://www.6mmar.com/65_SuperLR.php
dave



My last two 6.5-284 barrels lasted less than 800 rounds. I am seeing reports of 6mm CMs lasting 3000 and still being competitive. I really don't want a 243 AI. I might want to use my reamer for a repeater in the future should I like this and having plenty of experience with AIs, they don't feed in many rifles very well.

I can't find any match records showing anyone winning anything with a 243 AI either.

Right now I am leaning towards the super LR since it seems to be the easiest to make brass for. I bought 2000 243 cases today so I am not going to neck a creedmoor or 6.5x47L down.


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Last season I ran a 6mm Dasher.
Ran 105g Berger hybrids at 3070 fps.
At 500 yards I have never seen a rifle shoot that well.Or come togeather as fast to find a load.
At 1000 yards in the two day shoot I shot back to back 29s.Which is just excellent.29 out of a possible 40.At 1100 rounds even though we scoped it and it didnt look all that bad.Im down to the low 20s if im lucky.
I played around with the load and came up with a dandy load at 500 yards that did very well.But running 100 fps slower than my 3070 load.You can just watch those bullets blow around in the wind.When the conditions are mild its ok.But in the middle of the afternoon.Its just not very effective..
I shoot against guys running just about everything.6x47s 6mm Dashers and Kevin Cram actually runs a 6CM with the 115g DTACs.Another guy runs a 6XC.They all can be made to shoot very well and there all nice and mild in the recoil department.Which makes the a pleasure to shoot.But if you run them up over 3000 none of them last very long.
A 6.5x47 at 2000 rounds can still win a match at 1000 yards.
No 6mm I know of can do that.

dave



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Originally Posted by dave7mm
A 6.5x47 at 2000 rounds can still win a match at 1000 yards.
No 6mm I know of can do that.

Bullshit.....

I set the IBS 6 & 10 target 1000 yard agg records with a Dasher that had close to 2100 rounds on it, at 3075 fps......

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laugh

Empirical evidence sucks.

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6mm-06 is one of the best 24 cal rounds you can build and the most over looked.


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Why not just shoot a243? That is what I shoot. 105 berger hybrids 2950fps with lots of room to go up. Shoots lights out. My 9 year old hit the 6 inch by 12 inch steel at 500yds this morning. It shoots about.7 at 200yds. Brass are easy to get as well. Might be much less complicated.
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Thats great.
I hope it keeps on keeping on for you.
But it is a different game.
At williamsport the guys will get the dashers out when its nice and calm and shoot bugholes.And theres nothing better for shooting little ones at 1000 than a well tuned dasher in dead conditions.But when the conditions kick up they put the dashers away and dig out the WSMs.
IBS matches are fun but offer limited shooting.Shoot a couple sighters.Wait for the 15 second call and squeeze off your last sighter round.Then run your 5 rounds.What? Shoot 8 or 10 rounds? And then spend the rest of the day cleaning after you hardly get it dirty.Thing should last 2000 rounds..
Stroking stuff is what IBS shooters are good at.
The Dasher is an excellent round but keeping it tuned is more work than its worth.The other problem is hitting targets and not knocking them over.Seen it.Really sucks hitting a coyote and it not falling over.Like I said its a different game.
...
I have seen the claims of boocoo barrel life for the 6mm CM.I have read it anyway.You pour that much powder down that small of a hole and bad things happen.The 6mmCM has a very short neck.I would pass.

dave


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Don't try and pretend you can school me on Dashers and/or 1000 yard shooting.....

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