I emailed lee precision and this was their reply
A .300-221/300 Fireball Factory Crimp Die would have to be a Custom order. The collet-type Factory crimp die can be made for a wide variety of cartridges. Most rifle cartridges will fit into the 7/8-14 thread die body. If your cartridge falls within the following parameters it will fit into our standard 7/8-14 die;
Bullet diameter .177 - .501 (minimum - maximum)
Body diameter .295 - .580
Case length 1.345 - 3.400
(all dimensions in inches)
Cartridges over the maximum in any of the three parameters will probably fit into the large-series dies. These have a 1 1/4-12 thread, so your press must be capable of accepting this thread size. To place an order, send payment of $25 for a 7/8-14 series die, or $50 for a 1 1/4-12 series die, plus $4 for shipping and handling, and a dummy cartridge (a bullet seated in an empty case). The dummy cartridge is for testing purposes, so please make sure it is within normal dimensional tolerances.
Custom Carbide Factory Crimp Dies for handgun cartridges can be made for most handgun cartridges that are not in regular stock. Cost is $30.00 plus $4 for shipping and handling. In most cases, a dummy cartridge is not necessary for Carbide Factory Crimp Dies. Sizes available run from 25 ACP sized cases up to the 480 Ruger. The 50 AE cannot be made because the carbide ring necessary for this cartridge is too large for our manufacturing process.
Our address is:
Lee Precision, Inc.
4275 Highway "U"
Hartford, WI 53027
Thank You,
Lee Precision
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