Need to neck down about a thousand 6mm Remington cases to form 22/6mm Rem brass. Before when forming just a few cases used a Sinclair neck turning tool. A little too much work for a thousand cases.

Also need to form a lot of 6mm/06 Mashburn and 7mm/300 Wby. The 6mm/06 Mashburn will need neck reaming. Not sure about the 7mm/300 Wby. (Prairie dogs are getting tougher these days.)

Any ideas for neck reaming a lot of necked down brass ?

Hammer

Other than a neck reaming die, about the only viable alternative is neck reaming on a case trimmer. I've had reamers made up by both Forster and Wilson. On the Forster everything is "floating" so the reamer is going to follow the hole and path of least resistance and that's probably the least accurate and reliable because the case is held by the collet at the base. However, if the walls of the brass are reasonably uniform, they'll do a reasonably good job. Forster will cut reamers for you of any size for about $25.

The Wilson system seems a bit better because the case is held in the holder and isn't as susceptible to floating. I had them cut one reamer for me for some Jamison cases and I really couldn't tell that much difference between cases reamed on a Forster or on the Wilson. I don't recall what I paid for that reamer, but it was reasonable.

Of course the last alternative is to get a reaming die which is quite a bit more expensive. I got several from RCBS some time back. I don't know if they are even making them any more since they stopped producing other custom dies. I understand Redding will produce customs. The reamer die is nothing more than the FL die with a pilot hole the size of the reamer. You can FL size the case and then ream while it's still in the reamer, but the reaming does take quite a bit of time. You can expect to pay between $125 to $200 for such a custom die. You can always turn the necks, which might be the least expensive, particularly if you already own a turner. With an electric screwdriver to turn the cases it's about as precise as you can get. Any of the systems will be tedious and time consuming for that many cases. Personally, I'd get a proper expander for the necks from either Sinclair or K&M and turn the outside of the necks.

The reamers for the trimmers are much cheaper, a bit faster and certainly not as precise.

Neck turning should be a LOT more accurate then reaming, if you are looking for the most accurate case you can come up with. Good Luck Bob

Rather than reaming, I would also recommend outside turning; due to concentricity issues. I use a Forster set-up, but any brand should work. Instead of setting it up in the usual manner, which is crosswise to you, set it up so that the end is to you, and at the edge of the bench. That way, you can use a drill to drive the cutter head. Once set up, you can turn case necks at a fairly rapid rate!

First be certain that you really need to change the necks! What are the facts on the clearances?



I would select the best brass for the project and have the chamber modified to fit the brass!



There already is a European factory cartridge similar to what your describing.