ive shot the jellyhead .570, ic .555, and several other chokes with nitros. the indian creek with theyre hevi shot blends shoot very well. the mega wieghts seem to like a more open choke, i had a undertaker .583 that i thought id try and it was by far the best preformer. This is just my experience but through 3 different 20ga's the jellyhead was the worst choke(besides a carlson) that i shot. got no where near the numbers i thought. but the undertaker is phenominal! i would quess that a rhino would get ya close to the numbers they say, but for 20 bucks i think most guys should try the undertaker.