Those velocities are very impressive. According to Quickload, to get those velocities in a 26" barrel, the pressure would be just over 88k PSI with Retumbo. The spec is for a max pressure of just under 64k PSI.
Edited: I looked closely at the settings that Quickload has for the Rum's and it appears the weighting factor for those cartridges was set for more of a cylindrical case instead of 'overbore'. So I am guessing that the pressure is less than Quickload is computing. Just FYI
Drop me your loads and I'll play with the settings to match your chronograph readings. Thanks AJ
I sure hope Quickload has something incorrect. What is your OAL for that round? As it does make a difference in that the longer you seat the bullet, the lower the pressure (until you get against the lands).
If some is good and more is better, then too much is just right.
My mind is a raging torrent, flooded with rivulets of thought, cascading into a waterfall of creative alternatives
Last edited by AJ Peacock; 08-19-2008 at 11:39 AM.