I want an AR-10 in .300WSM.   I came across these guys.
iyp.uswestdex.com/accuracysystemsinc/Page10.html
Has anyone ever heard of these guys?  Do they do nice work?  Any info would be appreciated.

Haven't come across Accuracy Systems before that I know of but the modification is a good use for the cartridge.

ArmaLite is also working on an AR10 chambered for the Remington .300 Short Action Ultra Magnum cartridge.  They say the design of the head of the Remington case makes it a better choice for the AR10.

The Winchester case holds about 6 grains more powder but not having fired either of these yet I can only repeat that Winchester says their cartridge is 10 ft/sec faster with the same 180gr bullet (2970 ft/sec vs 2960 ft/sec).

Looks like you can get the Accuracy Systems rifle now tho'.

Thanks for the post.  Didn't know "Accuracy Systems" had the AR-10 offerings.

My guess is that gunsmoke and knight`s are probably looking at this also.......

There is a review of this conversion, by them, in this month's Small Arms Review.