Dasher variants with their sharper 40° shoulders see hardly any case growth though.) Anyway, I do this job on a Wilson trimmer mounted on a Sinclair base.
You also need a Wilson case-holder for each cartridge you load (or sometimes cartridge ‘family’, one holder used for .243W, .260R, .308W etc). The holder is a stainless steel cylinder ‘chambered’ so the case is an interference fit – you slide it in, tap the case-head on the bench to hold it tightly and insert the duo into the trimmer clamping them down. The case is held absolutely true to the cutter blades and there is no mandrel pushed into its mouth to add friction and runout. When the case is trimmed, remove the holder and tap the case-mouth on the bench-top to free and eject it. This trimmer gives very accurate and consistent results but I still regard this as the most tedious handloading chore. After trimming, I use a Lyman mouth chamfer tool on the outside case- mouth edges, and a Hollands (no relation) ‘VLD’ chamfer tool inside the case mouth, this giving a smooth, shallow-angle and long tapered cut that allows easy, damage free bullet seating.
That just leaves the primer to give us a reloadable case, this long done with a Lee Auto-Prime, now using the higher quality but same principle 21st Century Reloading adjustable hand priming tool, seating them carefully and feeling them bottom in the pocket before adding just a little additional seating effort for a slight crush fit but ensuring you stay short of distorting the cup. Incidentally, I started out ‘uniforming’ primer pockets on new brass, but don’t bother now, these cases being so consistent. I only run a 0.062 inch flash-hole reamer in – you very, very occasionally get a case with an undersize hole.
Magnum primers must be used with all normal pressure loads in this cartridge to get the thicker cup and avoid cratering and blanking (piercing) around the firing pin impact point. The CCI-450 SR Magnum is the favoured model, although I’ve happily used the slightly softer Remington 7½ BR on many occasions too. With identical case-head dimensions to those on the .308 Win ‘family’, a Lee #2 Auto-Prime shellholder is used.
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