No. Two entirely different cartridges.
30/30, .243, 250 Savage, 300 Savage, 308 Winchester, 7mm Mauser
The only way to know is to shoot and adjust
50-200 or so
Yes.
rsi would say the value of the spanish mauser and bayonet value at 695.99 dollars
Define 7mm. Do you mean 7mm Mauser ( a little less than 30-06), or 7mm Magnum, (a bit more than 30-06)
You will have to call Browning with the serial number.
No, they are not interchangeable.
The serial number indicates a Model 1893 Spanish Mauser manufactured in 1921. Yes, it would be a 7mm with gas exhaust hole on left.
Bayonet; 10-50 USD
NO!!