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Old April 17, 2021, 01:40 AM   #17
Shadow9mm
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Join Date: March 21, 2012
Location: Indianapolis, IN
Posts: 2,068
Quote:
Originally Posted by lugerstew View Post
shadow9mm, I totally agree with you at this point, I have always used the hornady comparator to find the firm touch point of all my rifle bullets, I record this and then start with load development, and since he said it was a sine wave and you can start about anywhere, Ie mag length etc., I think I will stick with finding my load starting point with where my bullet touches the lands, with measurement with my hornady comparator.
I would not recommend starting at the lands. At the lands or jam will give you higher chamber pressures. You also lose velocity. More jump can increase velocity. I think starting at 0.020 off is a very practical starting point.

It's a good thing it's a sign wave. Ar mag lengths and 5.56 chambers have a ton of jump. Mine is over 0.100 if I remember right. Have a 30-06 with a ton of magazine room and a short throat. And a 308 with a short magazine that I have not gauged yet. Might be single feeding target rounds. Not sure yet.
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