certain rifles don't "like" certain bullet/powder combinations.
I once did a test with one of my rifles trying sierra tmk and hornady eldm... the tmk was consistently sub-moa over pretty much all loads and no poi shift @100m. the eldm only for one particular (very hot) load...
guess which projectile I went with...
another time one powder/projectile would not produce any proper groupings... same bullet with a faster powder... sub 1/3 moa!
does not mean eldms or the powder you are using are bad. they might just not work too well for this particular rifle...
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