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~ Calculate barrel twist rates.  FREE!

Simply click on the button below and enter your specifications. Be sure to use decimals in the correct place. The answer is in inches, ie. 12 means 1 turn in 12 inches, etc.

  Click here to start the twist rate calculator.

If the method above does not work for you then you will need to download the full version below. It contains a .dll file required to make the program run, all information is included in the read.me file.

 Click here to download Greenhill.zip

Now that you know the correct twist rate for your cartridge get a quote for that custom barrel job or rifle.  Click here!  We are experts at custom barrel installation.

 

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Born on: August 10, 1998