Yeah, Ohio doesn't have a limit on *magazines* - the way the law reads, the limit is on the *firearm*. If you set up the firearm in such a way that you can get 32 bangs in a row, you are wrong. You can have 50 or 100 round magazines, until you insert them into the firearm. At that point, even if it's a magazine-fed bolt-action rifle, it is treated as an "Automatic firearm" and is subject to further asinine restrictions.
Ogre, if you were so inclined, you could insert a block or sleeve behind the follower or under the mag spring to prevent the last three rounds from loading. Kinda like the block you'd have to put in your shotgun for deer or waterfowl.
To continue the hijack a little more...
Ohio has another spectacularly ridiculous stance on weapons... Firearms are regulated at the state level, but other weapons, including knives can be regulated at lower levels of government. The state says you can legally walk down the street with an AR15 slung across your chest, a shotgun over your shoulder, pistol on your belt; if you have a CHL, you can also carry an MP5 slung under your trench coat, pistols in pocket, ankle, and back pack. Completely inadvisable, but technically legal.
But, in some (most?) of our cities if you have a 2 3/4" steak knife in your lunch bag, you can be convicted of carrying a concealed weapon.