rebs,
Spotters are tough as they are one of those things that can't be made well for cheap. 2-300yd .224 holes ain't the easiest unless things are ideal and you have a decent target, (white) no mirage, and the sun to your back. You will see some, but it's not going to be horribly consistent.
Best advice I can give you is to find one of these discontinued Leupolds. They come up used fairly often:
They were made in 20X and 25X. This is the 20X. Glass is [beeep] good for the coin, and it will double as a fine hunting scope if you ever choose to use it that way. They are compact, lightweight, and you can usually find them for $200.00 ish.
The 20X with this quality glass will enable you to see what you're trying to see in ideal conditions, as well as be a GREAT all around spotter for you.
I've used the cheapest spotters to the absolute best spotters, and this scope will serve you well. Save your coin, be patient, and find one.
Travis