Thread: Rate of twist for M&P 9 ??
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Old 08-24-2012, 11:56 AM
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Arthury Arthury is offline
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Quote:
Originally Posted by Jim Watson View Post
18.75" same as they have been using for .38 Special for about 111 years.

Heavier (longer) bullets call for a faster twist.
But the 18.75" has been good for 158 and even 200 grain Specials for a long time now so there is nothing to worry about in 9mm

Most European 9mms have a 10" twist (probably 9.84", four turns per metre) and they don't "overstabilize" a 115 grain bullet, either.
Why so stark in difference between the Europeans' design choice vs S&W's choice for twist rates?
Is this what is causing the accuracy issue reported in the last couple years?
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