I have also found the FTX bullet gives excellent accuracy with my favorite load of WW748 powder too!!
I tried it a couple years ago and posted up, like you, about th excellent accuracy I got with it!
To date I have two deer with it, both at very close range bullet impact vel was close to 2300fps and both bullets failed to completely penetrate intact. BUT pieces of each did. BOTH deer where recovered close to impact points, one ran about 50 yards and died as it tried to jump thru a laurel bush. The second one within a couple steps kinda tipped over.
So I would say its a bit lighter constructed then a std 30-30 bullet. But not so much that it will be a problem. Actually the opposite as I assume being it spitzer profile and excellent accuracy, may see use at longer then regular 30-30 ranges.
I like the bullet and will use it again, but I think I like my Hornady 170g bullet better.

CW