A local smith who does work for me made a recent model 7 youth 223 into a 300 RSSGI (300 whisper). He used a Shilen number 3 contour. Barrel cut to I believe 17.5" gave a muzzle diameter of I believe 0.780. It shoots. One in 8 twist will be the way to go.
I recommend supporting your local smith if at all possible to build a good relationship and save you shipping charges. If that isn't an option, Spook on this board does great work, and is very knowledgable.
I've ran Shilen, PacNor, and Brux barrels on all of my builds, and have no complaints. I have not used any of the rifling variations you mentioned on the 300 RSSGI. The barrels from AAC are finished in a way that I would stay away from due to concern of heat exposure, not to mention they are made by a mystery maker who spends his off time as a rocket scientist who practices voodoo.....
Last edited by ohnomrbillk; 02-23-2011 at 02:52 AM.
Reason: had to add the voodoo comment
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