I lived by "to hit small you have to aim small" as a seriously smitten long range predator/varmint hunter since the 50's. So I always had a couple of extra high quality high mag fine hair/dot target rifle and handgun scopes on hand just for load work. Never felt the need to go more than 36X though, and some where 20X or 24X, some 1" some 30mm tubes for the rifles. I got by with 10X target and 12X handgun scopes (but always wanted more on them).
Target design is another huge factor, and most commercial targets just don't do it for me for precision shooting. So I designed and made my own, both very easy to do with a computer, printer and graphics app, and they are real cheap to have more than you'll ever need. Best of them design wise for load work had a fine diamond as the aiming point, allowing the H & V reticles to have a specific "point" to bisect that perfectly centered the dot in the diamond. Allowed me to have as close to the exact same aiming point as possible on every shot, so they really did show what a load is capable of.
I made dozens of designs, all sized for specific uses, but settled on what worked best for my eyes at the ranges they were shot at (100 to 500 yards for most, but I also had 1000 yard targets).
Always had some "fun" targets I'd made along too for after the load work. One in particular got a lot of use from this varmint hunter - a life size ground squirrel silhouette with just a 1" white circle as the aiming point. I'd put them at various ranges out to 500 yards and switch between those to about 250 offhand and those beyond off my portable bench for some excellent field practice. I also made targets specifically for both open and peep sights.
Some that worked well for me for load work and for field practice...