I have a Marlin Glenfield 30GT rifle from 1980. On the barrel it says 30GT! Its a 30-30- so as late as 1980 30 cal was used to indicate 30-30 on several rifles!
Actually the .35 was only a 336 chambering !
You may be technically correct, but no 30GT rifles were ever made in any caliber but 30-30! The 30GT meant 30-30 caliber.
The Marlin Glenfield 30GT was only made in 30-30 caliber. Yes the GT stands for Glenfield Texan. Put the 30 and GT together and you ONLY have a 30-30! The rifle has an 18 1/2 inch barrel, full length tube and straight stock. Only 7,737 were ever made in 1979 and 1980.