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So the 1/3 moa groups my 223 HB shot with a magnetospeed on the muzzle were flukes?? If so then how about the 1/2 moa ones shot with a std weight Tikka?? Ive shot hundreds of groups with various...

Thanks for that, its the simplest and best explanation of the EC approach I've seen...

^^ - yeah I think the EC thing is a bit too gear orientated.

An alternative approach is to look for a resilient load, this is one that is stable across a fairly wide weight of powder variation . ....