Sinclair Mandrels used in 21st Century Holder?

[MDof2]

Does anyone know if the Sinclair neck resizing mandrels are compatible with the 21st Century Expander Die Holder? Or vis versa?

 

[spife7980]

Yes.
Sinclair, 21st, PMA mandrels and holders all swap with one another.
K&M is the proprietary odd ball.

 

[MDof2]

Excellent. Thank you.

 

[mmlook]

you can also use the Sinclair mandrels(steel or carbide) in the 21st century neck turning lathe

 

[JimmyRig]

Any idea if "Forster" is compatible with 21$t? Especially interested in outside neck turning and the forster is only available in Australia lol

 

[Smittiac]

I can go measure the 21st mandrels top if you need a comparison?

 

[Smittiac]

The hole is .378 and the mandrel is .376, not sure what the lip is that it rests on but I'm sure it's only a few thousandths smaller.

 

[JimmyRig]

Huge help.
Ive sent them a message but its a holiday and well im like a little kid waiting on presents.
My graf order never went thru a week ago and im like they dont sell my cart. Lol

 

[Smittiac]

100% been in your shoes and am pretty much all the time lol glad to help.

 

[JimmyRig]

Thats my number of .1850 Forster pilot
Looks like a no compatible situation
Thanks for answering that

 

[JimmyRig]

Im not even sure of a outside neck cutter capable of cutting the .458 socom.
Or am i just missing it. No option for 21$t, hence I emailed to find out.
It is an ocd thing for sole completeness in case prep for me. Ive heard two different theories of why and why not but i have a little science mentality that knows the truth. Haha

 

[Smittiac]

I would only personally bother neck turning if the brass wont chamber because the neck thickness causes the loaded diameter to not fit in the chamber neck.... As you fire and size the brass flows towards the neck and I think if you FL bushing size then expand to the same size each time it will be pretty damn uniform. .0005 difference isn't really readable to most our gauges we buy anyways.

 

[JimmyRig]

See my theory is a case "skimmed" true inside and out is going to give near-perfect grab and tension. Im a
close-as-possible tolerance kinda ocd. Both in mechanical and carpentry or tattooing or piercing. I wear many hats but they all will fail me if not I am satisfied. No im not really a maniac or press my clothes but if i can control concentricity,damnit thats my responsibility

 

[JimmyRig]

Anyone know of an outside neck turner capable of .458 with an angle cut ?

 

[Smittiac]

Could get a mini lathe. then turn w/e you want however you want.

 

[JimmyRig]

Yep i wish. I have been thinking about that exact thing not to mention all the other fun. Thats a big rabbit hole. Dont make me pull the trigger. Lol
How much? I have been restraining myself from looking. Haha

 

[Smittiac]

Oh I wouldn't buy a small lathe for any less than a grand probably. The cheap ones would just piss me off cause I couldn't do shit. I need a mill personally so I can start speeding up woodwork like magwells and action beds etc. Have a ton of black walnut up here and am gonna start making custom BR stocks.

 

[JimmyRig]

I fell a tiny dead black walnut i wanted to make some parts of a craps table with.
Chip rail and corners.
Walnut is sexy

 

[Smittiac]

Have a nice chunk I'm gonna start on for my Ruger while it's raining.

 

[Smittiac]

Saving the burl slabs for when I get better lol.

 

[JimmyRig]

Takes some balls and perserverance to get to grinding on wood. Good luck it will be stunning