And Eric Goss @ AxisWorks in Tempe builds a ton of them. They are awesome.
I have 2 different 6.5mm rifles. A 6.5 SLR and a .260 Rem. Since they are basically the same thing, I rechambered my .260 Rem into the 6.5 SS. I gained 300fps right off the bat with my fire forming loads. Hope for another 50+ more when load development is complete. The fire forming loads are also shooting in the .3s.
This was with my Premier Heritage on it just to check clearance.
Here it is with the permanent scope. S&B PMII 5-25×56.
Fired & fully formed case on the left, fire forming loaded round on the right.
High .3s for my fire forming loads.