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1.105 and 1.09 were the lengths i found Litz mentions the second one, so yes you are on the limit. Try them at 100, then repeat it at 200 or 300 that will soon show if they are becoming unstable in...

If he was an "islander" he'd have enough extra fingers to work it out, the rest of us have to use a calculator.

Forgot to mention all measurements need to be imperial

Use this formula to see if its feasable. If the bullet speed is over 2800 fps 180x bullet diameter squared/ bullet length = twist, if speed is below 2800 replace 180 with 150.
This (the greenhill...