T/C Encore Carbine project, continued ...

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This Saturday I was moving some long guns between safes and came across a partly-finished project that I had set aside in 2020 when my wife became ill.

This gun started with a custom cartridge, which I had come up with by the simple expedient of running .357 Magnum brass into a .30 Mauser resizing die. The inspiration came from reading about JD Jones' .300 Whisper -- this was back in the mid-1990a, quite a few years before the .300 AAC Blackout became a thing. There were and are plenty of other necked-down .357 wildcats floating around, but I thought mine had the advantage of being easier to form and reload using off-the-shelf dies. I call it the cartridge .3057 (pronounced "thirty-fifty-seven") Shadow, and got as far as having a chamber reamer made and then had to put the project aside when my dad passed and I had to help out my mom for a couple of years.

3057ShadowDJD.jpg ReamerCtgPhoto.jpg

My first attempt to have a gun chambered for this cartridge happened in the early 2000s. I took a slightly-rough Martini Cadet action and an FN Mauser 98 barrel in .308 Winchester to my gunsmith and told him what I wanted. It didn't turn out so hot. The barrel was profiled and fitted the way I'd specified, but chambering and extraction were both very hard. I got distracted by something else and put the barreled action aside, not coming back to it again for almost 15 years.

I obtained a couple of new Cadet extractors from a friend in Australia, and then removed the barrel and reamed the chamber slightly deeper. Function was almost perfect now -- cases still occasionally hung up short of full ejection, but I could figure that out later. I made a new stock and forend, had sights installed and the metal matte blasted (to hide some shallow pits) and Parkerized dead black. It shoots pretty good, but in deference to this late-1800s action I've kept my handloads very modest.

MartiniCadet3057.jpg

Shortly after restarting work on the Cadet project I acquired a T/C Encore action. I shot it first as a handgun in .44 Magnum, but I had a notion to see how the .3057 would perform in a more modern platform, preferably with an optical sight. I contacted Match Grade Machine and worked out the details before sending them my reamer. Along with the usual specs I wanted to fit the barrel with an E A Brown scope base with an integral peep sight plus a front sight, for which they obligingly drilled and tapped.

I decided to go with a thumbhole stock, and ended up buying two different options: a pepper-laminate from Boyds, and T/C's own synthetic buttstock. I didn't care for the shape of the T/C forend, so I bought Choate synthetic forend, belt-sanded off the impressed checkering, cut the tip off squarely and painted it with bedliner paint. The two synthetic stock elements ended up matching pretty well.

I was still deciding on a suitable optic when (as mentioned) outside events caused yet another hiatus. I had mounted a Leupold 1-4x VX Hog scope at one time, but that later got hijacked and now lives happily on my Ruger No.3 Carbine in 45-70.

Encore3057.jpg

Looking over the carbine on Saturday, I considered just buying another Leupold but decided to hunt around online for a bit first.

One interesting option I came across was a very compact 4x fixed-power scope from the economy Monstrum line:


My previous experience with Monstrum was that they offered very heavy optics that were often otherwise excellent values. This particular scope was only $80 from Amazon, which seemed a pretty safe gamble -- I've paid more for scope rings. I ordered mine Saturday evening, and did the one-day shipping option. When it arrived about 16 hours later (I still can't get used to this!) I discovered it also featured an illuminated reticle -- I should really read item descriptions more closely.

Mounting this scope was slightly complicated when I discovered the slots on the E A Brown base were a bit too narrow for the crossbolt on the QD rings I had. That required a few minutes of careful file work and some black spray paint. I also had to cut a small relief notch into the sleeve of the rear lens cover to leave room for the rear peep.

Here's how this rig looks now:

3057EncoreCarbineMonstrum4x.jpg

I wouldn't exactly call this scope fetching, but the seemingly Soviet-era design school at Monstrum lends a certain SciFi/Steampunk quality to the rig. More importantly though, I found that I can properly focus on this scope's etched reticle, despite the increasing astigmatism in my right eye. This has gradually become a more significant problem, to the point where I have to shoot with some optics off my left shoulder.

I'll hit the indoor range soon to zero this scope and get some chronograph numbers for my last batch of handloads.
 
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The 3057 sounds like a great idea, I want to try one using 360dw brass for just a spec more powder capacity. I love your carbine, it's just so right. Good build and good write up!
 
The 3057 sounds like a great idea, I want to try one using 360dw brass for just a spec more powder capacity. I love your carbine, it's just so right. Good build and good write up!

I hadn't heard of the 360 DW before but your idea sounds excellent!

When I was considering starting loads I sectioned a case formed using standard .357 brass to compare with a .300 AAC Blackout case. Note the difference in web thickness:

SectionedBlackoutShadow.jpg

I've thought about trying cut down .357 Maximum cases, but I didn't want to use up any of the small supply I have on hand. The DW might be the better choice when it's available once more.
 
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I hadn't heard of the 360 DW before but your idea sounds excellent!

When I was considering starting loads I sectioned a case formed using standard .357 brass to compare with a .300 AAC Blackout case. Note the difference in web thickness:

View attachment 1195325

I've thought about trying cut down .357 Maximum cases, but I didn't want to use up any of the small supply I have on hand. The DW might be the better choice once it's available once more.
I also thought about the maximum, but if I'm going that far I might as well go 303 brit, 30-40 krag, or 307 win. The 360dw just seems the sweet spot. And Starline has brass quite often. Just run your reamer in another .10-.12 and load away!
 
Note the difference in operating pressure.

Exactly.

The T/C Encore is designed to handle warmer chamber pressures, but standard .357 Magnum brass isn't. Hence the need for more suitable parent brass before trying anything beyond 40K PSI loads.

It's still plenty of fun to shoot with lighter stuff, but I would like to eventually to stretch its legs a bit.

The Martini Cadet carbine has turned in some decent groups using 123 grain Berry's plated spitzers (resized from .311 to .309) over 6 grains of Trail Boss in reformed .357 Magnum brass. I haven't chronoed this load as yet, but I'd be surprised if velocity reaches four digits.
 
I have a similar project in mind. 30 carbine necked to 6.5mm. Slightly scaled down version of your idea and would be quite suitable for light actions and short barrels like a TC contender might use. I need to make a contender barrel stub, then seat and chamber an old arisaka barrel just to see what the round feels like before I jump in any deeper. The arisaka barrel has plans for getting chopped anyway just to use the old barrel shank as an adapter to take AR15 barrels without the barrel extension.

Really like your style. That martini is a beauty and the TC is nearly the exact idea I have for my pipsqueak monstrosity.
 
I have a similar project in mind. 30 carbine necked to 6.5mm. Slightly scaled down version of your idea and would be quite suitable for light actions and short barrels like a TC contender might use. I need to make a contender barrel stub, then seat and chamber an old arisaka barrel just to see what the round feels like before I jump in any deeper. The arisaka barrel has plans for getting chopped anyway just to use the old barrel shank as an adapter to take AR15 barrels without the barrel extension.

Really like your style. That martini is a beauty and the TC is nearly the exact idea I have for my pipsqueak monstrosity.

One limitation with the TC is that it's extractor-only. I have a late-production H&R Handirifle in .300 Blackout carbine that's also extractor-only, and I've found that fishing out a rimless Blackout case is more of a chore than with a rimmed rifle or revolver case.

This might just be me though, since I bite my nails pretty short. :)

Some of the earlier H&R Handi-rifle barrels came equipped with an 'enthusiastic' spring-loaded ejector that made life a lot easier in this respect -- you can still catch the spent case for reloading pretty easily by putting you hand behind the chamber as the action opens. I've got one of these too, rebored and chambered in .38 Super.

NickleSuper.jpg

Later on in your project you might want to consider finding an ejector-equipped H&R in .22 Hornet as a rebore/rechamber candidate.
 
One limitation with the TC is that it's extractor-only. I have a late-production H&R Handirifle in .300 Blackout carbine that's also extractor-only, and I've found that fishing out a rimless Blackout case is more of a chore than with a rimmed rifle or revolver case.

This might just be me though, since I bite my nails pretty short. :)

Some of the earlier H&R Handi-rifle barrels came equipped with an 'enthusiastic' spring-loaded ejector that made life a lot easier in this respect -- you can still catch the spent case for reloading pretty easily by putting you hand behind the chamber as the action opens. I've got one of these too, rebored and chambered in .38 Super.

View attachment 1195387

Later on in your project you might want to consider finding an ejector-equipped H&R in .22 Hornet as a rebore/rechamber candidate.
I would just be happy to find a handi-rifle in any flavor. They are super scarce now. I used to have a half dozen because they were so cheap I could get them thrown in on swaps, but not anymore.

I did buy an interesting critter this past year though. A 50 cal muzzleloader with a quick finger tight breech plug that looks like it could be replicated with a barrel blank assuming I could get my lathe to cut THAT thread. Not sure what it is, but it’s strange, and I don’t have much in the line of change gears for my little Chinese tabletop machine.
 
Very cool. I have a contender pistol chambered in a cartridge I call 308 max, which is a 357 maximum case run through a 300 ham’r sizing die. I want to do a carbine with a 357 mag case necked down to 22 cal. In a shortened 221 die
 
I chronoed a couple of Trail Boss handloads at the indoor range (I convinced them it is a PCC, which I guess it is) today.

This load actually did better than I expected, though it seems like I have my work cut out getting the SD down to single digits. I'll try weighed charges instead of using the dipper next time.

3057123grTB.jpg

Best 10-shot group from 10 yards, not yet zeroed. Now if it would just do this at 50 yards I'd be ecstatic!

3057123grTB10Shots10yds.jpg

The other load did almost exactly the same as far as grouping and velocity -- lighter bullet with a smaller charge. SD and extremes were worse, though the sample size was 50% larger.

305797grTB.jpg

Both loads were very pleasant to shoot.
 
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