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Well an engineer I am not, but I do some machining. The .240 WBY is my favorite cal. The one I have now has a custom 1:13 twist barrel. We also removed the "free-bore" portion of the reamer so the rifling comes to the case mouth. Bullets? 65 gr. Hornady V-max @ 3864, 85 gr. Sierra hpbt @ 3710, 85 gr.Nosler Partition @ 3566. Above loads all standard rifle primers, and all H-4831 SC. Next project will be 55 gr. Nosler b-tips and will start with H-380, H-414 and WW 760. Regarding the metric question, metric threads are measured in pitch rather than TPI. Example: 1.00 pitch will move 1 m\m on 1 full turn---.50 pitch will move 1\2 m\m on 1 full turn etc. You can also purchase inexpensive metric thread pitch gauges. Thank-you all for taking a look at the tip. 240 wby
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