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6BR die set of course, but make sure you have spares especially as these pins are only 0.057”, a mere 0.002” smaller than the nominal hole diameter on Lapua brass and are therefore easily broken. If you deprime cases as a separate step using a dedicated die you must obtain a correctly sized rod/pin, the fixed-pin Redding model needing the optional .17/.20 calibre rod, Sinclair’s decap die also using a different stem plus detachable Hornady small diameter pins.


Sinclair International makes a special BR/PPC flash-hole uniforming reamer (#07-3000) that is inserted from the rear of the case and indexes off the primer pocket which works in all four designs. Nevertheless, it increases the flash-hole diameter a little to 0.063 inches, the reason for the discrepancy being that Lapua’s production tolerances are 1.5- 1.6mm (0.059-0.063 inches). Purists are dubious about this tool, but it is usually reckoned that accuracy deterioration starts at rather larger diameters, getting on for 0.070 inches. If you do use the Sinclair reamer, standard diameter decap pins should now fit but only just!


If this all sounds very nerdy, remember you’re paying £1 or so each for your Lapua cases and want to get full performance out of them. Alternatively, you’ll wish you’d known about this issue if you break the decap pin in your 6BR sizer die as you load ammunition just before a major match and discover every other pin


60 Target Shooter


you own is oversize!


Most flash-hole reaming tools designed for standard diameter flash-holes are inserted via the case-mouth and are designed to remove any burrs or metal flashing from the internal or ‘exit’ (in terms of primer gas movement) end of the aperture, these often being substantial in many cartridge cases with punched flash-holes. Burrs should be removed as they may affect ignition consistency and the subsequent charge burn. You can’t use such a tool on a BR case because of the oversize reamer, so is de-burring an issue here bearing in mind Lapua and Norma drill flash-holes instead of using the cruder punch method?


Shooters have spotted internal burrs on some batches but I must admit I haven’t to date. Also, some precision shooters like to cut the tiniest bevel on the exit end of the flash-hole to act as a venturi. If you feel an urge to do this, there is no handloading tool I’ve seen to date but the answer is to buy a cheap pin-vice and a micro drill bit that is only just larger than the flash-hole’s 1.5-1.6mm diameter, but be careful not to force it into the flash-hole proper and start reaming it out.


Many are of the view that Lapua brass is so well made and consistent that you can simply ignore these matters, likewise don’t spend time and effort on ‘uniforming’ primer pockets - just ensure you have


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