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Old 08-22-2019, 10:20 AM
joet333
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I have also seen the POI shift among different lots of .17HMR and .17HM2. I have been measuring bullet seating depth (as measured from the ogive to rim) and sorting into groups for testing. In my rifles, it seems as though bullets seated closest to the rifling (longest OAL) give the most consistent groups, by eliminating the fliers. I am still testing, so too soon to draw conclusions, but the results have been positive. I recall that Steven Boelter ( of RRDVegas) had improved accuracy of .17HM2 by measuring and sorting bullet seating depth from the ogive. Handloaders would understand this principle as the seating depth affects chamber pressure and velocity.
It would be interesting if anyone else has done similar testing and post results here.
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