New to muzzleloading... love it!

Purchased a TC Triumph back in November. Honestly didn't have any idea what I got myself into, good thing I found this forum. Sales guy told me "everybody uses these", meaning Powerbelts. My Triumph didn't like them. Picked up some Traditions 250 gr, sabot loads (only other bullets they had), found enough accuracy at 60 yards, with open sights, to take a deer.

Foreword to this week, purchased a scope. Sighted in the scope with 250gr shockwaves and 2/50gr pellets of T7, 3 shot groups touching at 60 yards. Great! And good enough for now, will work up to longer ranges later. Now i get to the point of this, I also picked-up .490 round balls and proceeded to shoot 3" groups at 60 yards with 50gr of T7. Surprised me!

So... if i could bump-up the load to 60-70 grs and still maintain accuracy, would that be enough to take whitetails at close range with the round ball.(this year took mine at 50 yards) ?

Interested, well, because its muzzleloading!