Dave T. T-7 is really tweaky. So go to the Hodgdon's Powder portal page, and poke around. Sooner or later you'll find their T-7 2F chart. it gives the correct charges, for several cartridges. T-7 is lighter than B.P. and more powerful. So you have to pay close attention to what they tell you, with their cartridge reloading chart for it. The good part is that T-7, 2F will measure through my RCBS powder measure. It doesn't like air space over it, and it doesn't like being compressed more than a smidge. So only load it in the cartridges listed, and keep the air space down, to as close to zero, as possible.
Also, be aware that this powder will try to settle somewhat, giving you some unexpected air space, under your bullets.