First question nick murry is...what type are you flying?
As a general rule of thumb, most modern T/P aircraft...and I don't include the Texas lawn dart, Bandit etc....the .48 mach number will likely relate to the point that the aircraft/airframe is safe to operate with no adverse flight characteristics with a safety margin (typically 10-15%).
At the speeds you are talking about, I suspect it is very unlikely that there are implications as to the prop tips becoming supersonic.
Having said all of this, it is difficult to do nothing more than speculate until we know what aircraft type you are referring too.