yes, it' s true that your M-70 .30-06 can be rebarreled to many different cartridges.....but there' s other issues here.....is it a Pre-64? Does it shoot good as is?

Pre 64 winchester model 70 command a premium price " as-is" and ofter the cost of rebarreling is greater than trading guns completely.

Find someone that knows Model 70s and get some private coaching on that question......your question is way too complex to answer here.