Oh I know, that's how I recognized the two barrels for what they were on ebay.  Brought in back in the 50s by Globe Firearms Co. They were converting Norwegians to both .308 and .243.  The .308 was their model 777 I believe.  Don't know what the model # of  the .243 was, but I know of at least one in Canada that a fellow has been using with factory varmint ammo on coyotes.  I noticed that Remington and Hornady both make a reduced recoil loading in .243 both of which produce some mild pressure.  I could mark the loading gate as only for those loads, and/or Hodgdon youth loads!  I hereby disavow any responsibility for any future harm that might come to those who do not read!