[quote=Shotgunjones]"As for CIP numbers, per the latest information I have--which comes from the British Association for Shooting and Conservation--it now appears that velocity is measured at 2.5 meters."
"I'm betting that 1450 figure is true muzzle velocity.
This is consistent how? Is not Hull Cartridge actually governed by CIP standards?"
Good question & it appears to me that there is no consistency or truth in advertising when it comes to manufacturers published velocity figures.
I was impressed by Rottweil's stating 2.5 meters as their measurement point for velocity until I found different & apparently current Rottweil advertising stating velocity as "mouth velocity" and quoting the same exact velocities for the same loads as were published for 2.5 meter velocities. As we have discussed, it can't be the same for both. At least they do state something other than "velocity".
If you care what velocities your loads are providing(& my impression is that very few people do) I'm thinking that Shotgun Jones has the right idea about using chronograph to test the loads yourself. It might not be up to laboratory standards but it seems to me that the info will be of more use than the manufacturers published data in most cases.
I've been using a chronograph for handloading rifle cartridges for years but I never felt the need to chronograph shotgun cartridges until recently.
I don't think accurate velocity figures are as important in shotgun shooting as they are in rifle shooting but I would like to be able to compare & select loads that I can be confident will effectively kill game & will have the least wear & tear on the gun.
Last edited by Brittany Man; 02/20/14 08:02 PM.
