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Critique my plan: Ruger Single Six "M1877-ish" in a 10mm low-pressure wildcat

This is a discussion on Critique my plan: Ruger Single Six "M1877-ish" in a 10mm low-pressure wildcat within the Projects forums, part of the Firearm Forum category; Hello fellow Ruger fans, to keep a long story short I've dreamed of having a custom Ruger sixgun since I was a teenager in the ...

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Old May 7th, 2017, 06:57 PM   #1
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Critique my plan: Ruger Single Six "M1877-ish" in a 10mm low-pressure wildcat

Hello fellow Ruger fans, to keep a long story short I've dreamed of having a custom Ruger sixgun since I was a teenager in the 1990s, but have never gotten around to living that out despite owning a number of stock Ruger revolvers (including a 9mm Speed Six and 9mm SP101), and a .32 H&R Single Six that the prior owner had customized.

Fast forward to the present, and I have some decent cash on-hand since I sold some big-ticket items, no debts, no wife/kids, and I figure now is the time to get a dream Ruger. My budget is roughly $2k but I could go a little over for something amazing, or would be happy to go under.

Over the last year or so, I narrowed my idea down, and what I want is a modern Rugerified "reimagining" of the old Colt M1877 "Thunderer" in .41 Long Colt. The 1877 was DA/SA but the DA lockwork was terrible so I'm not missing much by building it on an SA-only Ruger frame. And rather than reload the heeled-bulet .406" cartridge, I have a cool wildcat idea I'm excited about.

.41 Spl can baaarely be shoehorned into a Single Six, but smiths hate doing it since it involves enlarging the loading cutout. The .38 Special however doesn't require those cuts, and the .40S&W/10mm Auto are surprisingly not the much wider than .38 since they lack a rim, so might be able to squeak in without cutting. I don't want someone to grenade the revolver by putting stock ammo into it, so my goal is to take 10mm Mag brass, cut it down so it's too short for Mag and too long for Auto, and load it (very conservatively) to roughly parallel .41LC loadings. This is just for fun and plinking, I don't need a speed-demon, so I'd be fine loading it always subsonic, zero intent of stretching its legs on this little frame.

I've found a few cool photos on Ruger Forum where other members have posted similar M1877-esque projects, but in more conventional chamberings. I was going to post photos, but my post-count is too low; I have a more established account but am somehow locked out of it so the mods said I have to make a new account.

NOTE: in other threads I've been asked a lot of the same questions, so not to be a jerk but I'm going to put a little "FAQ" down at the bottom of this post so folks don't have to re-ask things. I also posted a list of detailed cartridge dimensions so folks can refer to those quickly side-by-side for .38 Spl, .41LC, .41 Spl, and 10mm Auto/Mag

MV's Current (developing) idea for the 10mm Single Six
  • Obtain a blued Single Six donor gun: if avoiding the CF conversion is desirable I'll get a .32 model, otherwise a .22 model. I want to end up with adjustable sights, but I'll ask the chosen gunsmith if they prefer to add adjustable sights to a fixed-sight variant, or prefer to modify/replace the stock adjustables.
  • Have a good gunsmith install a .400" barrel of 5", and make a custom cylinder (I presume it would have to be 5-shot?) for the revolver.
  • The cylinder will be for a wildcat based on a shortened 10mm Mag catrridge, deliberately designed so that 10mm Auto will fall through and 10mm Mag will not fit, to avoid anyone trying to shoot factory ammo that would exceed operating pressure.
  • Obtain and install some form of cool grip-frame for it (still deciding on that amongst the options, not in a hurry yet). To my knowledge the two Thunderer/Lightning options are NC Ordnance (brass frame, designed for Ruger but complaints of poor QC/fit) or getting a spare Uberti/Cimarron back-strap and trigger-guard (they're in-stock with some parts dealers) and modify it to take a coil spring and fit the frame, which at least one member here has done and said it was surprisingly easy.
  • Gunsmith will buff off any obsolete markings on the frame, and in the same Ruger font will put my currently-secret name for the wildcat, code-named ".402 Umptyfratz" for the purposes of planning.
  • Once all parts are together, gunsmith will re-blue it, but I don't want a rich lustrous blue, I want something that's basically just functional, and then either I or the smith will artificially patina the gun until it looks old as heck (but not abused).
  • Install cool-looking grips, something that looks *vaguely* vintage but is modern and durable with no animal products. My initial thoughts are ivory paper micarta, or hemp canvas micarta
  • Still to be determined: specifics of grips and sights, and any other aesthetic tweaks (BP chamfer?) that aren't too pricey and look cool. Not looking for engraved curlicues or anything, I want it to be a "brutal" looking gunfighter gat. But I'm open to any interesting contouring or whatnot.

That's where the idea is at currently. Totally open to suggestions, and before I contact the gunsmiths for quotes I want to have it decently-well narrowed down, then in mid-May will find a smith and start having donor and parts sent to them and get on the waitlist!

  • Q: Why don't you get a Single Seven in .327, or a Ruger Buckeye 38-40/40S&W, or a Flat-Top .357 Blackhawk, or an Uberti Thunderer in .38 or .41LC? Or a custom .327 Bearcat?
    A: I am completely aware of all those options, but I want something that is modern (so not the Uberti) and something that is custom (so not the stock Rugers) and something that puts the largest bullet on the smallest frame (but the Bearcat is a little smaller than I'd like).
  • Q: Why don't you chamber it in .38 Special, .38-40, .41 Special, .40 S&W, 10mm Auto?
    A: .38 isn't weird enough, 38-40 is too long, .41 Spl is a challenging conversion, and 40 and 10mm are often loaded too hot as stock rounds for that little frame.
  • Q: Won't someone grenade the gun by putting the wrong round into it?
    A: 10mm is rimless so only properly-sized rounds will fit the cylinder and fire, and my goal is to make the wildcat a specific length in-between Auto and Mag so no factory ammo will function in it.
  • Q: Won't this have terrible resale value?
    A: Sure, but I plan to pass this onto my kid (if I have one) or a niece or nephew, I have zero interest in its future marketability, I want it to be an heirloom of good quality worked by a good smith.
  • Q: Isn't this a waste of money and you should just buy a stock Ruger?
    A: Horses for courses, and I've been meaning to build a custom Ruger for half my lifetime, and I have as much as $2k (can maybe wiggle a bit) set aside from selling off some big-ticket items this year. If it were your money, I'm sure you'd buy something different.

Reference list of cartridge dimensions

NOTE: Ruger Single Six .22LR/WMR and the .32 H&R have a cylinder length of about 1.39" as I understand it

.38 Special (exists as 5- or 6-shot conversion already on Single Sixes)
Rim diameter .44 in
Rim thickness .058 in
Case length 1.155 in
Case width: .379 in
Overall length 1.55 in

.41 Long Colt
Rim diameter .430 in
Rim thickness .063 in
Case length 1.130 in (maximum)
Case width: .405 in
Overall length (varies on brass and bullet, some loadings use short 0.932 in brass)

10mm Auto (and Mag)
Rim diameter .425 in
Rim thickness .055 in
Case length 0.992 in (Mag is 1.242 in)
Case width: .423 in
Overall length 1.260 in (Mag is 1.55 with 180gr)

.41 Special (can be chambered as 5-shot in Single Six with frame cutaway)
Rim diameter .492 in
Rim thickness .060 in
Case length ~1.190
Case width .434
Overall length ~1.525 (so you'd need specifically short loads to fit a standard SS with 1.39 cylinder)

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Old May 8th, 2017, 05:55 PM   #2
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Sounds cool! I love some 10mm (Auto of course) and I've thought a 10mm GP100 would be cool. I like your idea of the smaller frame. Aside from creating custom ammo which is time consuming, I say if you can find a gun smith who specializes in such work and is willing to do it, go for it!
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