The 297/25 or 230 are two different cartridges. The 297/25 bullet uses a 25 cal bullet and the 297/230 uses a 0.225 bullet.
Some 297/250 is actaully a blown out 297/230. I have seen several advertised that were rechambered to 25/20 SS or WCF.
Both cartridges can be made from 22 hornet.