Re: 6.5 Grendel NFG
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Flight</div><div class="ubbcode-body">iirc grendels have some weird harmonics and pretty much require the barrel extension to be bedded with loctite.
I think there might be a few other tricks to assembling one of their uppers or at least the vendors allude to it.
You might want to double check on the 6.5 forum for best practices</div></div>
I assembled my own with the exception of the barrel extension to the barrel. I have no harmonics problems.
What I have had are load problems. Especially since I live up North where temps vary from well below zero in winter and near or above 100 in the summer. But, that has to do with case volume and rifle set-up, not harmonics.
The best load I've found for summer and winter, and it's been tried in 24" 20", 19.5/19" and 18" barrels is 29 gr. of IMR 8208 XMR. It's fast enough burning and has a soft pressure ceiling that works well for top end pressures in this case.
As far as the Shaw's go, they are decent, but if you really want better accuracy, there are better barrels to be had. And, worth the wait for.
-good luck.