Can I swap 110 grain for 110 grain as long as the overall length is constant?
The consistency of the overall length might gain you some compatibility in a box-magazine fed autoloading rifle, but that constant overall length is not
what you are looking for to create a safe, predictable load.
What you are looking for is to set a length that gives you the same internal space inside the cartridge case... at whatever COAL that may be.
Personally, I don't think you'll see much benefit. If you don't, and you are then simply looking for a less expensive bullet, I would suggest Berry's .30 Carbine plated bullet, purchased in a bulk box of 1,000. Kills all the stubby jacketed bullets in price and is rated to 1,900 FPS.