Reamer Pusher

[LVLAaron]

Not a 95 Palma by chance? I have one, it's great for SA mag length but the .470" @ .200" is definitely too tight. I open them up a few at the back.

It's an FTR reamer; but I think it was based off that palma

 

[ELR LVR]

^^ I did some barrels for a guy- he complained that they were super tight and wouldn't extract, had to beat the handle with a hammer. Same reamer his old guy used. Must be my fault so he brings it over. I make him bring his reamer print. He's got a tight reamer (308) with a .470 200 line. Old guy cut round chambers but were definitely oversized.

Even when you do things right, the phone still rings.

I'm willing to bet....
The old Guy chambered in a 3 Jaw
because "Well that's the way he's been doing it for yearrrrrrrrrrrs, WHAT's the problem?"
---------------------------------
Anybody wanna take a guess why that's not a good idea?

 

[Sniperhandle]

^^ I did some barrels for a guy- he complained that they were super tight and wouldn't extract, had to beat the handle with a hammer. Same reamer his old guy used. Must be my fault so he brings it over. I make him bring his reamer print. He's got a tight reamer (308) with a .470 200 line. Old guy cut round chambers but were definitely oversized.

Even when you do things right, the phone still rings.

The reamer gets a little smaller every time you use it too.

 

[X Count]

I don’t end up with a non-concentric hole or off center throat when I start my chambers with the center. I adopted it after many of the very same discussions on another forum years ago after Mike Bryant discussed doing it.

All I can tell you with my whole process is my throats and chambers finish concentric and on size. I’ve tried many different ways of doing it and it works for me. Experiment and find your way is all I can say.

Edit: To add I’m not advocating to ignore and not check your tailstock alignment altogether. I’m just reporting that my slightly high (and somewhat normal) tailstock doesn’t cause issues with my method. The other pondering I now have is most tailstocks have some play in the quill so who’s to say mine doesn’t center up a couple of thousandths under load when pushing on the reamer???

That's how the gunsmith I used did it. Using a pilot the back end of the chamber may cut oversize due to the tailstock being off centre but it will still be straight to the bore. Then switching to a fully floating setup.

Id wager that even if the back end is cutting oversize, most of the time it would match the angle of the reamer closer than most people can taper bore. So your using the reamer like a form cutter, in lieu of taper boring, until you switching to running it floating.

 

[WSnyder]

Id wager that even if the back end is cutting oversize, most of the time it would match the angle of the reamer closer than most people can taper bore

Posted earlier in this thread.

A tailstock .002" high over the length of 2.5" equates to an ∠α of 0.0458°.

If you pre-bore to what seems to be a common dimension of .010” under reamer/chamber dimensions you’ve got room to go after the chamber has been established and then switching over to the pusher. If you use the pusher straight off and that works for you then you’re golden