As an alternative, have you considered converting some .38 brass from centerfire to rimfire? This is one I made for a .38 rimfire rolling block. It takes a .27 cal nail gun blank. This may work in your rifle, it just depends on the position and shape of your firing pin tip.

I only dabbled with the 38 rimfire a little, but I've converted a lot of .25, 32, .44 and .50 cal cases from centerfire to rimfire with this method. I use a centerfire case and drill it out for the proper rim recess, just deep enough so the blank's rim is flush with the back of the case. I then mill or file a relief slot for the firing pin.  Here is a photo with the blank removed.  Using a 150gr heel bullet from Old West Bullet Moulds and a brown .27 cal blank with no additional powder gave me 752 fps out of my #2 Remington rolling block.  A nice easy load.

I can't find dimensions for the nailgun cartridge anywhere. Can you mike the case body and rim diameters for me when you have a chance? 

Also, I noticed that Hilti and Ramset both make .27 cal nailgun blanks and the local Home Depot carries both. Are the colors and loads comparable, as far as you know, i.e. is there an industry standard for interchangeability?

Thanks a million! 

Good video presentation, too!!

Locally it seems the green (#3 load) is the weakest one readily available in .27. Use it as is in a sound gun, or dump propellant and use as a primer for 3F black?

17/64" drill bit for drilling out the primer pocket?   

Rim relief, .315" (8mm bit) or .316" ("O" bit) ?

I have a 2 part video series on converting .22 Hornet to .25 Stevens. Part 2 cover the centerfire to rimfire conversion. While this is for a .22 blank, the basic process is the same for .27 cal blank.

Since making this video, I now drill the rim recess on the lathe. The video shows doing it on the drill press.

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I have a Phoenix rifle in 40-50 SS. If I had your rifle I would move the firing pin and not do the rim fire stuff. I had a rim fire in the shop a few weeks ago that the firing pin was not hitting the primer enough to set it off and ended up making an off set to the firing pin to get it to work, that's what the customer wanted.