This photo illustrates perfectly my comments regarding Sectional Density and that it represents the average length of a bullet, not the ratio of length to diameter. The 375 is 356, the 423 is .005 more at 361. The 458 has a much more rounded point which makes up for its .014 increase to 375,
That's why for a given density of material (lead, copper) a particular SD will have an average length (which evens out point shape) regardless of diameter. Since the SD gives the average length, if it is divided by the bullet diameter the answer will be the average length over diameter, or an indicator of bullet shape.
The evolution of bullets has resulted in five methods of providing a bullet with desired expansion characteristics. The standard cup & core, the cup with bonded core, the H jacket, the solid base with lead frontal core, and the monometal. Each has its strong & weak points. The Woodleigh bullets (Soft Nose models) are cup with bonded core. the jacket is of sufficient thickness and strength and combined with the lead bonded to the jacket gives very predictable results. Since the jacket has a compressible inner core of lead for its full length (except the very base of the bullet) it does not have the problem of increasing pressure that plagues the H, solid base w/lead front core & monometal bullets- which those makers have mostly resolved by removing bands of metal along the length of the bullet where it encounters the barrel. I wouldn't go so far as to say that Woodleighs are the standard of measure for all bullets- there are some very good bullets of the different methods, North Fork and others, but for a cup with bonded core type bullet the woodleigh is among the best.
The evolution of bullets has resulted in five methods of providing a bullet with desired expansion characteristics. The standard cup & core, the cup with bonded core, the H jacket, the solid base with lead frontal core, and the monometal. Each has its strong & weak points. The Woodleigh bullets (Soft Nose models) are cup with bonded core. the jacket is of sufficient thickness and strength and combined with the lead bonded to the jacket gives very predictable results. Since the jacket has a compressible inner core of lead for its full length (except the very base of the bullet) it does not have the problem of increasing pressure that plagues the H, solid base w/lead front core & monometal bullets- which those makers have mostly resolved by removing bands of metal along the length of the bullet where it encounters the barrel. I wouldn't go so far as to say that Woodleighs are the standard of measure for all bullets- there are some very good bullets of the different methods, North Fork and others, but for a cup with bonded core type bullet the woodleigh is among the best.
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