I would appreciate some input on Vihta Vuori N530 powder given the following scenario. I took my AR-15 6.5 Grendel (direct impingement), assembled by a well-known AR gunsmith, for its first spin with Hornady, Sierra and Lapua bullets using charges of VVN530 just below max. Chronographed velocities were as stated in the manual, and accuracy was good for starters ( .5 to .8 for 5 shots at 100 yds.), but the rifle consistently failed to lock open (short-stroked), and in some instances, did not extract the fired case. I plan to try VVN140, H335, H4895 and IMR 8208 XBR.
Is there a burn rate incompatability problem with VVN530 in ARs , or do I have a rifle issue? Thanks.
Is there a burn rate incompatability problem with VVN530 in ARs , or do I have a rifle issue? Thanks.
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