MINI PROJECT RIFLE
REMINGTON 700 SPS TACTICAL by Laurie Holland
only takes a tiny shaving, a small fraction of a thou’, out of a single groove on each pass. The blank is then indexed round the tool to the next groove position and the process repeated several hundred times until the grooves reach the required depth.
Scope number 4 (or maybe 5?) on the rifle – a Burris 6-24X50 ‘Black Diamond’ target model. Nice glass, but shame about the little turrets and tiny adjustment markings.
(Left) A Mauser 7.92mm belt-fed MG34, the original GPMG and much feared by British soldiers who called it the ‘Spandau’ in WW2. This barrel-eating machine was the driver for developing the hammer-forge manufacturing process.
(Below) .223 Remington and Sierra’s 80gn MatchKing showing the bullet base position at various COALs, that on the left at the SAAMI standard 2.26”. Barrel freebore that suits the centre pair is where Laurie would like to be eventually.
A faster if cruder method, ‘broached rifling’ was latterly used on military rifle barrels and saw a multi- point cutter pulled through the barrel that took a much deeper slice out of all of the grooves in each pass.
The Germans invented hammer forging around the beginning of World War 2, a direct consequence of their adoption of the world’s first belt-fed quick-barrel- change general purpose machineguns, the MG34 and later MG42 models, as the firepower generator in every Wehrmacht infantry squad. With scores of thousands of these frighteningly effective weapons in use by the middle of the war, each with a 1000 rpm or higher cyclic fire rate and swallowing vast quantities of high-pressure 7.92X57mm 198gn bulleted cartridges, barrels had a necessarily short life and the demand for replacements was insatiable. (There’s a nightmare thought – the match grade F/TR machinegun. A 120 second burst and you need a new Bartlein or True-Flite at £650 and up chambered and fitted!)
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