Try Hornady FPB bullets, they are 350 grains, no sabot required. They load easy and shoot great in my gun over 100 gr Pyrodex. No deer within 100 yds is safe this year. I'm sure 100 gr T7 will work fine. I've always liked bullets on the heavier side too.

Initially I had trouble starting these bullets, but with the correcttip on the starter, and a good whack with the palm they go right down. Then they slide the rest of the way to the powder with little effort.