I've asked about this previously but never really got my head around it. Just now I've found my .338 Lapua brass is tight to chamber after been fired and neck-sized twice, I am using Redding deluxe dies, and just measuring COAL rather than measuring from the ogive as I just anted the loaded rounds to fit in the magazine (rifle is a Savage) accuracy has been excellent but with the cost of Lapua brass I want to be mindful of brass longevity.
So, am I correct in understanding I need to get a shoulder collar to fit the shoulder angle (and maybe a better set of calipers) to measure headspace from my fire-formed cases, then play around with my FL sizing die to bump the shoulder 2 thou or so, or maybe get a set of Redding competition shell holders in 2 thou increments to do it? If I do it by just unscrewing the FL die, will it mean the necks will not be sized fully? Also, I see that standalone shoulder bump dies don't seem to be available for the .338, so could I just get an engineer to bore out the neck part of the FL size so it leaves the neck alone, and neck size with the neck size die as a separate step? Will doing the above still work the body of the case to any degree worth worrying about?
Cheers for any advice, Tom
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