Be careful, and go slow if you are new to this.

T7 forms a crud ring in BP rifles. And it also forms a crud ring in the base of your brass on the inside. And this can lead to big problems. So go slow and be careful here.

Join a couple of BPCR forums and learn how the guys who are shooting T7 are doing it. There is a lot more to it than just selecting an amount of powder like you do with smokeless.

If you already know all this then please accept my apology. I do not mean to rant on. But if you are new to this, and especially if you are new to BPCR, then you are starting out with the wrong powder.

Other guys on here know more about this than I. But I believe T-7 is a sugar based product that will leave a crud ring in the bottom of your case. This changes the volume of the case. And in a cased cartridge, volume is EVERYTHING. Go slow, and spend a bunch of time researching this.

And yes I realize that is what you are doing by asking this question. But IMO nothing is more important than safety. And I still double check everything I do for safety. And I have been doing it for over 40 years. And I would much rather have someone irritated with my post, than to see someone get hurt. And when you change the volume is a cased cartridge it is real easy to get hurt. Tom.