[imasam]

Can anyone tell me why the VP40 has such a high twist. I have been searching the internet for information. Stability calculations show excessive twist. Bullet diameter vs bullet length calculations. I just want to be better informed.

I'm new on the Site/ Forum here so I'm a little slow getting around. Thanks for any insight.. every bit of information helps.

 

[DudeRick]

Where is you get the high twist rate info from. I thought HK pistol barrels were in the 1 in 9 area.

 

[hgratt]

Can anyone tell me why the VP40 has such a high twist. I have been searching the internet for information. Stability calculations show excessive twist. Bullet diameter vs bullet length calculations. I just want to be better informed.

I'm new on the Site/ Forum here so I'm a little slow getting around. Thanks for any insight.. every bit of information helps.

Here is a site that has a lot of interesting information, but no derivations are given since modeling/analyzing exterior ballistics requires a reasonable amount of detailed math and engineering background. Hopefully, this will give you the insight you desire. Specifically look at the section called "bullets at short ranges".
Ballistics-How do bullets fly?