03 March 2007, 01:28
TReX300How much velocity loss per inch of barrel length...??
I'm trying to get an accurate idea of how much velocity loss you get per inch of barrel length lost. My chronograph is away getting fixed and I'm working on some loads. The loads are for a .219 Zipper. I'm useing .224" 45 and 50 grn bullets and H380 for powder. My Marlins barrel is 20" and the data is all for a 27" barrel. I've heard everything from 30-100fps.
Thanks
Tim
03 March 2007, 02:02
Ol` JoeIt depends on the cartridge and the rifle but you can usually figure 25-50 fps per inch.
03 March 2007, 03:51
ramrod340quote:
It depends on the cartridge and the rifle but you can usually figure 25-50 fps per inch.
Yep larger bore faster powder less reduction. More overbore slower powder greater loss because you need barrel to burn the powder.
Ran a zipper in Loadtech using a 40gr and the loss was 125-150 between a 27" and 20"
03 March 2007, 05:31
steve4102A little help from our friends here at AR.
http://www.accuratereloading.com/223sb.htmlAnywhere between 18 to 55 or even a little more.