I disabled the speaker cab on the HD500 amp block and ran it into my DAW where I tested a bunch of different IRs.
http://www.thegearpage.net/board/index.php?threads/free-ir-files.1552290/
1. 0:07 - Stock 25W GreenBack from Line 6
2. 0:52 - Redwirez Marshall 1960A-G12Ms-R121-Cap-1in
3. 1:57 - Redwirez Marshall 1960A-G12Ms-409-ConeEdge-6in
4. 3:02 - Tonic Waves Two Rock 020-TR 65 121 F_24bit
5. 4:07 - Englv30
6. 5:12 - G12h 57 Ofax45 1 in
7. 6:17 - Fredman Straight
8. 7:23 - 2x12 Chieftain Sm57 off axis b
9. 8:28 - Kathleen IRs 031a-SM7-V30-4x12
10. 9:33 - Ownhammer V3 412 MAR-RI V30 EN 16 Mix
11. 10:38 - Ownhammer V3 412 MAR-RI V30 EN 16 421-03
12. 11:43 - Ownhammer Public Beta Redux 412 PBR-BOG-ST V30 CH57 Brit Vintage 1
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