I know of an upper in .243 WSSM for sale.

Red,
While it is true that the .243 cannot be had in the AR-15 package, it can be built on the AR-10 that is used for the .308. RRA offers a complete upper in .243, with the caveat that the barrel is a 10-twist. This will likely limit you to bullets less than 85 grains or so with the barrel throated accordingly.

url=http://www.rockriverarms.com/index.cfm?fuseaction=category.display&category_id=529]RRA .243[/url]

Read my initial post in this thread for an upper that would be able to fling drag cheating 105 grain VLD's or A-Max's of that caliber at just shy of 3,000 fps. Looking forward to your progress reports....

I would have said more if at all.

I thought 10 twist was standard fare for .243 ?
Seems like my 6mm Rem was 9 twist.

12 twist was a fail for .244 except for short, light varmint pills.

DD,
A 9 would likely shine for most pills, but the slicker 105's are generally marked as 8-twist on their box for good reason. As indicated above, a 10-twist will likely be throated for the lighter pills. A man's gotta know his limitations....


Within certain constraints, the 105 VLD's can do some wondrous things.....

I believe a Armalite AR- 10 can be had with a 9.25 twist. Mine's a 10. It does the 87 V-Max ok. The 95sst's look like someone threw a handfull of gravel at the target..maybe that was me.. The 95 and 105 VLD's also suck. The only reason I have those longer bullits is my 6br is a 8 twist. It(6br) also likes the 107 sierra's which can be hard to find at times. Just repeating...kinda what your saying D. BUT..There is a bit of black magic going on with some barrels.

I think the way to do it is to roll your own.
I just built from scratch an Aero Precision AR15.
You pick and choose exactly the parts you want to use.

If you're into the 308AR/AR10 frame the absolute sweetest receiver set is made right here in Tumwater....(Mega also does the AR15 frame)
http://megamachineshop.com/armsnews.php
I feel like having a cigarette every time I look at one of those Mega Machine receiver sets and I don't smoke.
Put whatever barrel you want on it.
Careful though, Black Rifle is addictive.

Here's a great (the best) video series that calls out all the tools and details the assembly of an AR15.....
http://www.brownells.com/.aspx/lid=11004/learn/
For the large frame you will use a different method to hold the receiver.
If you can get your hands workin' it's not that difficult.

DAMN
Why the hell did I buy the 338 and the 7mm

'Cause you're a ballistic masochist, Art....

And then there's those 6.5's
They're like friggin arrows.

.260 Rem