This question has been answered before , just scrol down a few threads .
The magazine fits as the t3 's are long action , having a bolt stop differance for the short action . So if you load a long action clip in a short action the bolt would not come back far enough to pick up the cartridge .
I guess a smith could modify the lenght of the bolt stop - ----
So if you want to load closer to the lands It is to be loaded then as a single shot .With the Mag in place and used as a single shot you can feed this gun real quick . Saves time at the range .
From my experiance , once the gun is settled in and shows some good groups , just load to as it is limited to the mag , then be happy.