Pilot reported a near midair collision during approach.

Attributes
ACN	1740594
Time
Date	202004
Local Time Of Day	0601-1200
Place
Locale Reference	M03.TRACON
State Reference	TN
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Bonanza 36
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	Cruise
Person 1
Function	Single Pilot
Qualification	Flight Crew Instrument
Experience	Flight Crew Last 90 Days 60 Flight Crew Total 2100 Flight Crew Type 1600
Events
Anomaly	ATC Issue All Types Conflict NMAC
Miss Distance	Vertical 500

Narrative:

I was doing a practice RNAV approach. I was at 3;000 ft. And was cleared to the IAF and told to descend to 2;000 ft. I noticed a plane on my ads-B in that was 500 ft. Below and was going to be about the halfway point when we converged. I tried to radio the controller; but he was busy continuously on the radio with other planes. I continued at 3;000 ft. Until the plane passed under me. I took a picture of my G1000 screen that shows right after he was this happened. It shows the planes [tail number]. It was a very dangerous situation. Please contact me for details.

Original NASA ASRS Text

Title: Pilot reported a NMAC during approach.

Narrative: I was doing a practice RNAV approach. I was at 3;000 ft. and was cleared to the IAF and told to descend to 2;000 ft. I noticed a plane on my ADS-B in that was 500 ft. below and was going to be about the halfway point when we converged. I tried to radio the Controller; but he was busy continuously on the radio with other planes. I continued at 3;000 ft. until the plane passed under me. I took a picture of my G1000 screen that shows right after he was this happened. It shows the planes [tail number]. It was a very dangerous situation. Please contact me for details.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.