I have a 1.5-8 Minox on my musket currently but if I had it to do over I would not select the Minox. I have had a Sightron S1 3-9 mil dot on a musket and it did well. 50 cal muskets when zeroed at 100 will drop 10 to 12 inches at 200. Some states limit you to a 1x with a musket some dont. Given my preference I would put a fixed power 4x or 6x scope on the musket I consider them tougher because of less moving parts less to go wrong. The IOR 6x or the Leupold 6x42 would be my preference. If brush hunting the Aimpoint is the way to go I have had one of these aimponts on a musket pushing deer and it is awesome very fast onto target but they suffer some in low light where a more expensive Trijicon 1-4x does not. There is a used Vortex 2-7 on samplelist in your price range and they have a great warranty. I have had two Bushnell Trophy scopes on muskets they are OK but not the equal of a Leupold FX3 6x42 but the Leupold is double the price this is one of those things where you get what you pay for. The used 6x42 Super Sniper on Samplelist is probably the bargain but it is a larger scope with exposed target turrets which appeals to me because I will dial in correction and shoot a musket longer distance. The mil dot reticle is also quite applicable to hunting deer.
RANGEFINDING a 16 inch backbone to brisket deer body covering
1 mil = 444 yds
1.5mil = 296 yds
2mil = 222 yds
2.5mil = 178 yds
3 mil = 148 yds
3.5mil = 127 yds
4 mil = 111 yds
4.5mi = 99 yds
Each mil is 3.6 inches at 100 yds so to hold over for trajectory compensation.
Each mil is 2x 3.6 at 200 or 7.2 inches at 200 so for a quick 200 yd shot with a 10 to 12 inch drop on a musket sighted at 100 yds you could put the first mildot below center just below the backbone and impact should be 3 to 5 inches lower than that first dot.
If you are going cheap this is the scope to go with Ive run it on a musket very successfully.