I've got a couple barrels I'm trying to get rid of, but I keep getting questions about barrel twist and I'm not sure how to tell. I've looked at the barrel markings and I can't see anything that obviously indicates twist rate. The barrels I have are:

1. 25-06 off of a Stevens 200 that I bought about 18 months ago
2. 7mm-08 again off of a Stevens, exact date of manufacture is unknown, but it is at least 2 years old.

Does anyone know the barrel twist for these or can someone point me in the right direction about how to figure this out?
Thanks,
Dan