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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
short vs long mag
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<blockquote data-quote="MagnumManiac" data-source="post: 3098343" data-attributes="member: 10755"><p>Expansion ratio is the case capacity divided by the calibre hole in the barrel. The larger the case capacity and the smaller the calibre gets, a smaller amount of gas expanding behind the bullet which diminishes the return from the amount of powder burned.</p><p>This is often called 'Overbore' by many pundits, but this will turn heads, I don't believe Overbore is a real thing if there are powders slow enough to gain more velocity over previous powders available at inception. The 264WM is still in manuals with powders that were around when it was incepted, modern slow powders bump the performance considerably, such as RE25, H1000, Retumbo, Magnum, US869 & N570. Even H50BMG gains excellent velocities and the Overbore Monica is not a thing… Two of the best expansion ratios to be found is the 338-06 & 35 Whelen, the case capacity to bore is about perfect.</p><p>Another great example; the 6.5-300 Weatherby has been around a long time, Weatherby tried releasing it in the 60's, but powders back then weren't suitable. Today we have a plethora of suitable powders that can bring the full potential of the cartridge to life.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 3098343, member: 10755"] Expansion ratio is the case capacity divided by the calibre hole in the barrel. The larger the case capacity and the smaller the calibre gets, a smaller amount of gas expanding behind the bullet which diminishes the return from the amount of powder burned. This is often called 'Overbore' by many pundits, but this will turn heads, I don't believe Overbore is a real thing if there are powders slow enough to gain more velocity over previous powders available at inception. The 264WM is still in manuals with powders that were around when it was incepted, modern slow powders bump the performance considerably, such as RE25, H1000, Retumbo, Magnum, US869 & N570. Even H50BMG gains excellent velocities and the Overbore Monica is not a thing… Two of the best expansion ratios to be found is the 338-06 & 35 Whelen, the case capacity to bore is about perfect. Another great example; the 6.5-300 Weatherby has been around a long time, Weatherby tried releasing it in the 60's, but powders back then weren't suitable. Today we have a plethora of suitable powders that can bring the full potential of the cartridge to life. Cheers. [/QUOTE]
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short vs long mag
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