I've been having success with 0.000" to 0.001" case to boolit interference fit in the .44 Mag. Have about quit crimping as well, but that's with 2400, Unique and Trail boss. Probably will crimp when using H110, but that's generally a jacketed bullet powder for me.
Using the standard catalyst, the Hi Tek coated boolits have shifted forward little to none. Those Keith type boolit noses are positioned mighty close to the cylinder face, so it HAS been of some interest from a practical standpoint. Quite surprised by the lack of shifting, but it hasn't hurt my feelings one bit to not crimp.