I just had my Sportster out yesterday and put a lot of rounds through it!
Mine seems to like MOST ammo!
I've been using Winchester Supreme 34gr, CCI Maxi Mag TNT's and DynaPoints for a little variety. The Supremes and TNT's seem to be hitting the same POA, while the Dynapoints being heavier seem to be low about 1" at 25yards and worse further out.
When I shot for 'groups' one day, I found the Supremes holding a tad tighter. At 25 yards, I was tearing one ragged hole!!

At 50 yards they'll hold close to a half inch with me shooting!

They'd probably do better with a better shooter! Even with me shooting, I'd say they'll hold under 1.5" at 100 yards. This is with a factory trigger job and a Bushnell 3-9x40mm scope. I'd like to get a better scope just for smaller crosshairs!
I also like the performance of the lighter bullets on impact! As a comparison on targets, we had several 4oz bottles of eye solution, factory sealed for testing. The lighter bullets would blow the little bottle apart. While the Dynapoints blew through the bottles and simply knocked them over. If you want to see some explosive targets, use carbonated soda bottles factory sealed or even power drinks such as Gatorade. The pop bottles will literally blow apart! I had a Coke bottle practically disintegrate!! We hardly found remains. This is quite exciting for kids to see and helps them to realize what would happen if somebody was shot. My son at 7 years old has an excellent appreciation of the killing ability of firearms and is very safe at the range with me.