Glad I got my supply when things were BB (before barack) then I'm down to 2.5 lbs. I'm expecting that to last a while, right now I only use it for my 30-30s with a 110gn plated using 6-7 gns at a time. 1000 loads per lb.
That Bullseye in a 45-70 should give you a lot of loads per lb.
Magnum pistol powder should also work well in it. I use Alliant 2400 in my .32 Special, that only requires 9-10 gns per shot.
In the past I have used W296 in a lot of calibers but never in a 45-70
30-30s responded well to it with 110 gn jacketed round nose and HP's and 18gns.