Bushing Neck Die

[Steveu]

It’s caliber specific. A 40-65 will not fit.

[Kurt]

I could have make a bushing but I would need a chamber reamer for a proper fit. The Lathe I have is not friendly turning a taper like the .40-65.
Are you wanting a die that would make a taper crimp or a full neck sizing bushing die?
If I still had my Sheldon Lathe it would have done the job.

[Steveu]

Kurt, thanks for the offer. I am probably going to try the Lee collet die with a .410, .409, & .408 mandrels to give me some options on neck tension. Right now my load works best with some neck tension vs. slip fit. ES was 3 times greater with the slip fit in my rifle.

Cheers,
Steve

[Steveu]

Update on Lee collet die. The body of the die for a 40 cal or larger uses a 1.25x12 die body which will not fit the presses I have. So, I will put this project on hold for now and start working on a ddpp design.

Cheers. Steve

[Kurt]

That would take a press like the RCBS A-4 big max. Wonder why they would use a thread that large for a bushing die.
I will look through my die collection to see if I have a .40-65 taper crimp or neck a sizing die.

[Steveu]

Kurt, I have a through hole lap coming to open up the sizing die. Do you think a taper crimp die can be opened up?

[Kurt]

Steve,

If I understand you right you're wanting a .430" neck diameter? What is the fired case neck diameter?
If I understand you right you want to increase your neck to .430"? That would be very large for a .40 caliber.
But you would need a expansion plug to get it up there.
My .40-65 chamber is tight and the fired case has an outside neck diameter of .423". It was chambered with my reamer for PP only. I seen .40-65 chambers run from .426 to .435"
But yes you can open a sizing die or taper crimp with just emory cloth. This would work best if you spin the die body to get a uniform increase.
You can use a drill motor or drill press if you don't have a lathe for use. Just find a 7/8X14 coupling and a 7/8X14X3/8" bushing and chuck it up in the drill and go to it with sone 220 emery cloth on a dowel and finish polishing with 600-1000 grid or laying compound to get the mirror finish back.

[Steveu]

Kurt, thanks for the advice. My cases measure about 432-433”. I was thinking of opening up the neck to 429-430” with the adjustable lap and some 400 grit I have on hand.

[Kurt]

Ok I see. go to ACE or Farm&Fleet and get sone 150 grid valve stem grinding compound and start with it then go finer to polish. I have done this but I spun the die body.

[Steveu]

I lapped out the neck of my sizing die yesterday. Started with 280 grit for the first .007" and finished with some 400 for the last .001". It took me about 2.5 hours using a battery powered drill in a vice. It turned out great, the neck of an annealed starline case comes out at .428". My fired case case diameter is .432", so I have some room to do a little more if needed.