Originally Posted by Freddy
I am comparing the loads to a 16 inch barrel, I have 16 inch barrel data from a source. I have compared data from 16 inch barrels and 20 inch barrels, there is plenty of information on this subject online. Depending on the powder used there is about a 100 to 140 fps difference between a 16 and 20 inch barrel, slower powders have a larger velocity difference.



According to this using the same rifle, More like 150-200fps between 20 inch and 16 inch.

http://www.accuratereloading.com/223sb.html


Also according to Quickload using H-4898 in a 223 has a velocity loss of 180fps with your Barnes bullet from 20 inch to 16 inch.

Last edited by steve4102; 08/11/14.
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