Alot of guys do just what you are talking about for the same reason.
If you need to seat them back from the lands this will help as I'm sure you know and is why you're interested in doing so.
The VLD's, I'm told, will almost always do better up to even .040" "into" the lands, and do poorly away from them.
The opposite can be true for other forms though. Why? No idea, and haven't heard any either, but I've always wondered.
The last time I talked to Ken at K&M he told me he was necking something down to 6.5 I think, and he ended up with .038" thick necks.
Way more than plenty to turn them down to a couple thou total clearance if you wanted to.
He said he turns the excess off in "one pass" with his turner too, and takes another pass to clean it up, as it's spring loads the cutter from the back cut angle on it that forces the brass tight to the mandrel, which is why his cut to an amazingly consistant thickness.
You might call him and get his ideas on what to expect with what you have in mind, he'd probably have some good suggestions and is a "real" nice guy too. [img]images/icons/smile.gif[/img]
3. Can I just run 300 SAUM brass through the 7mm SAUM FL die and end up with 7mm SAUM brass?
I'm not sure about the SAUM cases but, with the WSM line, the 7mm is .035" longer so it won't accidentally be chambered in a .270wsm, this is probably the case with the SAUM family too but you could check at shortmags.org
where they list the case specs for all of them to be sure. All the wsm's have the same OAL but, the 7mm is longer at the shoulder than the 300 and 270.
4. How do I determine the actual neck dimmensions of the factory chambers? I will need to know this so I know how far to turn down the newly formed brass.
Only rely on a chamber cast IMHO, it will tell you everything. If you need any help, I have some pretty good details on doing them I saved from a couple good sources, you might want to read them over.
Ask away... best to get it straight from someone with experience, and you'll usually find one here or be refered to someone who does. [img]images/icons/smile.gif[/img]
Precision Shootings Reloading Manual, it is a pretty good referance on some accurate loading techniques and such, you'd like it.
Precision Shooting At 1000 Yards is another good book I'd recommend to anyone shooting long range. A wealth of info and very detailed too. [img]images/icons/smile.gif[/img] Starts off where everything else ends.
[ 05-05-2003: Message edited by: Brent ]