AcuSport have added .300 Win. Mag. and .223 Rem. to their Remington 700 line which features 5-R rifling. From the press release:
Following the huge success of the Remington Model 700 (#9663) with 5-R rifling in .308 caliber. AcuSport is pleased to add two new Model 700 rifles to the 5-R line. Features a M700 stainless steel barreled action with 5-R barrel, the same barrel, an aluminum bedding in block in standard VS configuration. The 5-R designation refers to the barrels five lands and grooves and eleven degree target crown.
5R rifling is said be to easier to clean because the sides of the lands are more rounded than conventional rifling making it easier for a cleaning patch to get into the groove. It also is said to prevent gas leakage. I believe the M24 Rem 700 variant uses 5R rifling.
I have emailed the PR guy at AcuSport asking what the MSRP is. When I know I will update this blog post.
UPDATE: MSRP is for .223 and .308 is $1,359. The 300WM has a suggested price of $1,379.
More info here (PDF link)