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The first time I used mine at the range, I shot a few rounds and asked the guys on either side of me, they said it was just fine. No experience on a big caliber and the Heathen, but with the 6.5 it should be no problem.
The Heathen installs without tools and locks up hand tight.
No shims or lock nuts required.
A short 14 second clip of the Heathen brake in action on my .260 Rem. Sorry, the sound doesn't work, but you can see how much the rifle recoils..........https://imgur.com/DJGnvIh