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22PPC performance ?

A related question. Can anyone tell me the actual rim diameter of Lapua 220 Russian brass?
I have a few AA 6.5Grendel cases that measure .437. Theoretically aren't they are supposed to be SAAMI spec .4449 same as 220 Russian/PPC.?
 
Before anyone else spends the time, the 10th Hornady reloading manual takes 22PPC up to 55gr bullets only.
 
http://www.accurateshooter.com/guns-of-week/gunweek067/
http://forum.accurateshooter.com/threads/22-ppc-with-80-grain-bullets-for-600-yds.3911440/

Not exactly what your after, but info is scarce. I would like to try one, or a 220 Beggs, maybe a 22 grendel.

I'm hoping to get some potential velocities before spending money for a barrel.
I specified the 75gr ELD-M because it has a significantly higher BC than anything else in it's weight class. I think it has the potential to resurrect some of the chamberings we're talking about.
If you run the numbers, it gives up very little to the 90's in drift, at least to 600yds when you take into account the higher potential MV..
 

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