I have been playing with a 510 whisper on my Encore for a few years. It only weighs 7.5 pounds, so when using 950 grain cast bullets, it is punishing. I usually shoot surplus M2AP.
I made a aluminum 2x18 inch silencer for it a while back. It adds almost two pounds of weight to the package, so it tames recoil a lot. It typically shoots about 2 moa with the surplus bullets, a bit better with amax. The cast bullets do less well than the surplus. Recoil was enough to break two scopes, and damaged a Leupold VX3. It also ripped off the bipod adapter and the fore end. I made a barrel band to hold the fore end on. It soots better off of a sand bag than the bipod.
I have made my own brass on a lathe using once fired 338 lapua, but it was inferior to the stuff supplied by Michiguns to SSK.
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