Origins of the “177th”
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Standard rifling = peak torque @ peak pressure
Progressive Gain Twist rifling = peak torque @ peak velocity
These are the prototype cases that your tax dollars paid big bucks for.
They should withstand overcharging your case pressure up to 80,000psi.
The alternative for the “soldier of fortune”.
https://www.alphamunitions.com/product/308-winchester-srp-small-rifle-primer-190914
An in depth explanation of “how”.
The new M8 military rifle.
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