Looked up 25/06AI ver. 257WBM Sierra Manual. There not much difference in velocity. That was my first response. I an again not a wby man, and I didn't like the free bore in their rifles either. I fired a 300wbm for my uncle, and I couldn't get it to group. If I remember correctly it was about 1.5" at a 100yds. Not my reloads either. He was happy with it, and so I left it that way.25/06= family sedan. Practical, good fuel milrage easy on the tires, family car.
257 Bee=Lamborghini. Expensive to drive but holy ****