DW RZ-10 and Underwood Ammo

[JBT]

Does this model have a ramped barrel? Not saying that is the cause, I just know Underwood doesn't recommend shooting the 165gr in a 1911 style pistol with a without a ramp barrel.

[arentol]

The RZ-10 does have a ramped barrel, but I am still not ruling out case bulge as partial or full cause of the problem. I have pretty what appears to be the same problem with this ammo in my new (used) Fusion 10mm Commander that does not have a ramped barrel. However, the Fusion also has this issue with Double Tap ammo as well, which the RZ-10 does not.

Since I already have one on hand I am going to try a 3lb heavier (27 instead of 24) recoil spring in the Fusion and see if that solves the issue with Double Tap ammo. I don't expect the Underwood to work in that gun anyway so if it doesn't help with the Underwood I won't really mind. If it does help with Double Tap then I will probably order 2lb heavier spring for the RZ-10 to see if that solves the problem.

Does that sound sensible?