Why a tapered case such as 9mm is not as reliable as a straight case like 380ACP?
I found this article very interesting.
The title: The 9mm Automatic (not Luger): A better 9mm cartridge.
http://38super.net/Pages/9mm%20Automatic.html
Summary
A straight-walled rimless 9mm cartridge (not...
Why do a lot of these seem to have 1:8 instead of 1:7?
I think that's because of bullet stability. The higher the bullet speeds (longer barrel), the bullet spins faster at the same twist. In 20 inch or longer barrel length, the fast spin (1:7" twist) hinders the accuracy of light bullets...
I tried and compared both and found that a muzzle-insert boresighter is better than a bullet-like boresighter.
1. a muzzle-insert is for multi-caliver by exchanging the bore-tip according to the caliber.
2. a muzzle-insert has longer length than a bullet-like, which makes more accurate to...
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