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re: A rule of thumb on changing point of impact on fixed sighted guns

Posted on 9/15/14 at 8:50 pm to
Posted by DownshiftAndFloorIt
Here
Member since Jan 2011
66763 posts
Posted on 9/15/14 at 8:50 pm to
Wait wait wait

If y'all are right, why is a .45/70 usually like 1:20 and a .223 is 1:7????
Posted by Hu_Flung_Pu
Central, LA
Member since Jan 2013
22218 posts
Posted on 9/15/14 at 8:57 pm to
I'm speculating but it may relate to the shape of the slug and the casing size. 70mm vs 45mm

Magnum loads are usually less aggressive. Might be the time allotted within the barrel won't allow for a more aggressive twist. Again just guessing.

Maybe the ratio from velocity to twist is proportional to smaller loads.
This post was edited on 9/15/14 at 9:01 pm
Posted by Tigah in the ATL
Atlanta
Member since Feb 2005
27539 posts
Posted on 9/15/14 at 9:00 pm to
there is a formula based on bullet mass diameter & length
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