Yep, while it's cheap and actually a great refrigerant (Hydrocarbons rock. There is no question) it may not be ideal for your compressor.
R410 compressors generally use a low compression ratio. For R410, they are 12k btu, for instance.
For gasses in the 'normal' range, if you will, that drops significantly.
R290 is among the lightest of the medium stage gasses. Temps are similar to 404a and the like, but it's molecular weight is very low, and in an R410 compressor that effect is amplified.
However, 12k btu is far more than anyone needs for a single. Seriously, I find 9000btu/3/4hp quite adequate.
So you may find that the actual use of this compressor using lighter gasses, to be closer to the 9000btu mark. So it would actually be great.
Back to gasses, R290 is fine in a system that...
1. has NO leaks. High quality flex, to prevent future leaks. is brazed with purging to prevent additional carbon build up in the system.
2. Is vacced well before charging. Air in any system is bad. In a system using propane (r290 is propane. Real 290 has no smell, but is no less propane) it becomes a potential bomb.
But for a system you keep, and don't ship, and make properly, 290 is among the best gasses I've used. Sounds weird when there are other colder gasses, but tuned well, you can get the same temps as some of the other gasses with lower head pressures and better oil flow.
I don't recommend propane to anyone really, but hydrocarbon gasses are well known to be some of the best performing out there.
Otherwise, 404a, 402a, 507, and any other gas you can find in the range of -40 to -50 atmospheric boiling point will do fine in that compressor. It's made for 410, so will handle the gasses with higher pressures well.
If you can find cheapish 402a, it's very good too, and I've found that the R290 component in it to work with all oils amazingly well. I tend to add 3-5% more 290 in systems with 402a, due to it's enhanced oil misciblity, and at under 10% there is NO risk of flammability. I know, I've tested it.
So hit up Ebay and any other resource you have, and see what you can find for gasses, you may get lucky and some fridge guy is getting rid of a bottle for cheap.