Hello gents i picked up a butchered no4 mk1 rifle a while back. While researching on restoring it to military looks atleast i started looking at rebarreling. While beating the bushes of the web i seen numerous 45-70 conversions. I would really like this idea. Now not being able to find a barrel is it possible to bore out a 303 barrel to 45 70? Does the reciever need any modification? Can anyone help with info on this type of ordeal?