I use Winchester "out of the bag" for 308 with excellent results. However subsequent reloading of the same brass usually opens up groups slightly, don't have records handy to show exactly. Still under a minute with the reloads, just that virgin brass seems to shoot a tad tighter than full length resized reloads.
I've used Federal in 30-06 for feeding my Garand, but I haven't got enough experience to say whether it is good for 30-06 or not, but it didn't need any extra prep from the bag either to hit my accuracy goal at 25 meters for initial sight in (had my summer taken away by training at Fort Sill, so it may be a bit before the Garand gets a range trip).
Jimro
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Machine guns are awesome until you have to carry one.
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