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Join Date: Jun 2009
Location: Northern Berks County, PA
Re: Isn't it odd, strange, interesting......
The bitter edge may or may not be the actual "bitter edge".
When I started using QuickLoad software, which uses the actual capacity of a case fired in THAT rifle, I had a real awakening. I have a 30-06 shooting at book max with a real slow 2700fps for a 165gr Partition. I was really disappointed in that speed, although accuracy is good, and honestly, I stayed with the load because if I want more oomph to a 30-cal, I use my 300WSM or 300H&H.
When I ran data into QuickLoad, including fired case capacity from that rifle, I found for that rifle/chamber, I'm not at max. Not even close to max. Speeds track to pressure and point to the load being well below red line for that rifle.
The rabbit hole goes deep.
Otherwise, I've been told (and seen it bear out) that particularly magnum rounds want that hotter charge to get uniform case obturation to the chamber and produce more consistent velocities from shot to shot. I have no flippin' clue if that is the actual reason, but I've seen in bigger capacity rounds that bigger charges tend to give more consistent speeds, for sure.