[Amps] Glitch resistors

[n4zr@contesting.com (Pete Smith)]

Has anyone had any experience using Vishay Type RH metal-cased wire-wound 
resistors (for example Mouser p. 205) as glitch resistors?  There is no 
voltage rating given, and I'm skeptical about flashover between the 
windings and the metal case at 2500V and up.  What about the Vishay HL 
silicone wirewounds ( see Mouser p. 204)?  They seem like a much more 
conventional choice.  Price is right for both, as is range of values available.

73, Pete N4ZR
Sometimes a tower is just a tower