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NWPilgrim · March 4, 2012, 10:04 PM

Kayser,

You are spot on. I posted in another thread here a couple of examples of changing the COL, and the velocity changes slightly but the pressure changes quickly in increments of 0.010". This is why for dramatically different bullets such as Barnes all copper you should use data from the bullet manufacturer. IIRC most reloading manuals have a caution about using different bullets than the ones listed.

I always run my test load data through a program called QuickLoad that will calculate the changes based on myriad factors, including COL.

Before I had Quickload, if I used a different bullet than the one I could find listed, I would either slightly adjust the powder or the COL to compensate on my work-up loads.

March 4, 2012, 10:04 PM	#3
NWPilgrim Senior Member Join Date: September 29, 2008 Location: Oregon Posts: 2,346	Kayser, You are spot on. I posted in another thread here a couple of examples of changing the COL, and the velocity changes slightly but the pressure changes quickly in increments of 0.010". This is why for dramatically different bullets such as Barnes all copper you should use data from the bullet manufacturer. IIRC most reloading manuals have a caution about using different bullets than the ones listed. I always run my test load data through a program called QuickLoad that will calculate the changes based on myriad factors, including COL. Before I had Quickload, if I used a different bullet than the one I could find listed, I would either slightly adjust the powder or the COL to compensate on my work-up loads. __________________ "The ultimate authority ... resides in the people alone. ... The advantage of being armed, which the Americans possess over the people of almost every other nation ... forms a barrier against the enterprises of ambition." - James Madison