Why would you rollmark a blank before it's machined? One of the last process's is turning the o.d. to the customers contour. The un-turned blanked are usually stamped on the breech end with all the critical information after they are drilled,reamed and rifled, and only after they pass quality control. They have to make that far before they can be turned and chambered. Up to that point, they are labeled as a bore size and twist rate.
Savage uses a color coding system on the end of the billets, until they are turned and threaded. Once the painted end is cut off, they are stamped with a letter code. I can tell you that purple is for .270 Win.
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