Greetings Matt -- Measure your two cast bullets. If you can shoot them unsized it might be a good experiment. Some rifles like .268". I generally load 20 rds to see what's what.
Fast pistol powders seem to produce excellent accuracy. I use Reddot, Unique and 2400. At the moment I'm very short of Unique so I'll use Reddot. I also just bought a 8 pound jug of 5744 so I'll load some with that.
I don't have a photo of a Busk diopter. The Hooka looks a lot like the Lyman 48. You'd need an appropriate front sight as well. The Swedish target front sights are rather scarce anymore. I like the Lyman MJT which is a large tunnel target sight that takes various inserts. The little dinky Lyman 17 is way too small to hang off the end of a 29" barrel, IMO. The Hooka looks like you'll need to remove some wood on the right side directly in front of the bolt handle. If you go that route do a neat job and it won't kill the value of the rifle down the road. At least its a Swedish diopter. I have one rifle set up with an Elite and one with GF.
http://dutchman.rebooty.com/targetsights.html
This is the GF diopter.