18 January 2008, 03:58
mstarlingBC of Remington 405 gr 45 bullet??
Anyone have an estimate of the ballistic coefficient of the 405 gr Remington SN bullet for the .45/70?
I think it will be close enough to the cast bullet I make to allow me a to get a rough ballistic curve.
Thanks!
20 January 2008, 00:25
delloroit usta be on remington's site somewhere. IIRC it was in the 0.180 - 0.210 range. just above "brick" but below "rock."
20 January 2008, 01:30
wrongtargetSierra Infinity 5.1 indicates it uses a .281 BC for all velocity boundaries.
Ballistic Coefficients to Velocity Bounds.
0.281 for all velocity boundaries.
.458 dia. 45-70 Govt, 405 gr. SP 20 January 2008, 07:45
South40Lyman cast bullet #457193 (405 grain flat nosed)has a ballistic coefficient of .307 --S40
20 January 2008, 12:38
fredj338quote:
Originally posted by wrongtarget:
Sierra Infinity 5.1 indicates it uses a .281 BC for all velocity boundaries.
Ballistic Coefficients to Velocity Bounds.
0.281 for all velocity boundaries.
.458 dia. 45-70 Govt, 405 gr. SP
The Speer 400gr is pretty close in shape to the RCL. I would bet right around .220?
20 January 2008, 13:42
asdfThe tables that come with the QuickTARGET software list .280 as the BC.
One of the calculators
on this site will estimate a BC for you based on bullet dimensions. Unfortunately, lead bullets usually have bands which the calculator doesn't consider. If you have a chronograph, one of the other calculators there will let you compute the apparent BC, which you can then use in the calculator for trajectory and wind drift.
20 January 2008, 21:48
dellorowell then I stand corrected; the 405 is a bit slicker than a rock after all:
Rem 405 BCit is 0.281