Just received back from John Taylor at Taylor Machine my .32 Walking Rifle. John machined a new 26" barrel chambered for .32 S&W Long to fit my pre-war H&R .410 single-barrel shotgun, so that I could keep the shotgun barrel, rather than relining it. It has a XS Systems ghost ring peep with Williams 3/8x.093 Twilight aperture and .080" XS Patridge sight with vertical white line inlay and is also drilled and tapped for scope blocks.
The older H&R single-barrel .410s have a tiny receiver, much smaller than the current NEF and post-war H&R versions. It has the proportions of an English Rook rifle. Weight of the converted rifle is 5 lbs. 2 ozs. with iron sights, and 6 lbs., 4 ozs. when you add Unertl blocks and a 6X Small Game straight tube scope.
Haven't shot it outdoors yet, but factory .32 S&W Longs, either wadcutters or 98-gr. LRN are no louder indoors without ear plugs than firing Eley Tenex in my .22 rifle.
I'm figuring that my ordinary .32 S&W Long handloads I use for walking around in my S&W Model 31 or Ruger Single Six (Saeco #325 SWC cast of wheelweights, tumbled in Lee Liquid Alox, sized .312", with WSP primer and 2.5 grs. of Bullseye), which give 850 f.p.s. in a revolver should remain subsonic in the rifle. My heavier load, 7 grs. of #2400 with the same Saeco #325 bullet or the Hornady 85-gr. XTP JHP, which each give about 1050 fps in the revolvers should approximate standard .32-20 rifle ballistics (probably around 1300 f.p.s.) in the Walking Rifle. I stuck to the .32 S&W Long cartridge instead of .32 H&R Magnum because I already had a reamer left over from Ellis Lea's and my experimental work with the T/C Contender in the early 1980s.
As FYI for anyone wanting to build one, rifling specs are equal width lands and grooves, standard ".30 cal. dimensions", nominally .300x.308"six grooves, one turn in 16". Chamber reamer made by JGS has minimum body dimensions approximating the SAAMI pressure barrel, but the ball seat and throat have a 15 degree "second shoulder" or transition from the .335" case mouth to a forcing cone major diameter of .3114," then a 3 degree included angle forcing cone, with no cylindrical ball seat. This resembles the throat in a 7.62x39 Lapua pressure barrel and enables you to seat an RCBS or Saeco 150-gr. FN cast lead .30-30 bullet with only the base band and gascheck heel in the case, and the case filled up with 10.5 grs., lightly compressed of RL-7 for subsonic "blooper" load, which is VERY accurate, based on firings years ago in a heavy test barrel.
Range report will be posted when I get a chance to test thoroughtly.