Dave Kiff at PTG makes reamers I understand, for both
the RMC long case and our long case.

Tested my 499HE in a NEF. Loads I didn't have to
full length resize the case, only top 1/4 of case.
325gr at 2600, 500gr at 2150.
In NEF got both weight bullets 300 fps faster,
still extracted very easy.I got reamer. Just run it
in NEF 500 chamber and you got a blaster. And add
a little weight and thick pad to the gun.I have
a barrel ring to hold forearm along with original
bolt, as I added weight there as well as the butt.Ed