![]() ![]() Once finished, this bore can be lapped with a moulded slug using lapping compounds to smooth and polish the tooling marks to whatever level the price/quality level is required. ![]() There can be anything from two grooves upwards, but generally an even number with six being common.(Occasionally, special patterns with uneven groove numbers exist, which result in more complex groove shapes to make ‘5R’ rifling, but for now, let’s keep it simple.) After many passes cutting each groove, fractions of thousands of an inch at a time, it moves round to begin cutting the next groove. How are cut-rifled barrels made? In the case of a cut rifled barrel, which is the oldest, yet still most precise method for true match barrel manufacture, the diameter of the hole will become the diameter of the ‘lands’ of the rifling.Ī long bar with a cutter in place is then repeatedly run up and down this tube with a slowly rotating motion that equates to the rifling twist rate. ![]() There are three ways to make a rifled barrel and they all start with a steel bar, deep-drilled to form what will become the bore of the barrel.ġ. Rifling and twist rates always get mentioned in my reviews, and I often get questions from readers about this, so I thought I would demystify the subject. Chris Parkin explains the engineering behind that all-important element that gives the rifle its name - the barrel rifling - and looks into twist rates and how they are added to the barrels. ![]()
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