I think you should inform engeeniers from Nistali about your knowlage. They claims:
Protection against AP bullets:
- 12.7mm B-32 AP bullets - point-blank;
- 14.5mm B-32 AP bullets - at 50m.
Hull protection against 30mm AP ammunition at firing angles of ±30° at 0m.
source:
http://www.niistali.ru/pr_secure/bmp_en.htm#2 Please note that 30mm AP has penetration like 50-60 mm of RHA at 1000m. It's not APFSDS with penetration 100-120mmm of RHA.
TM's about Bradlay says that in frontal arc it is protected against AA autocanons (so I think it is rather against 23mm API).
For example: Ulan's at weight of 29 tons has
Ballistic protection: Cal. 30 mm x 173 APFSDS @ 1,000 m horizontal, lateral range of +/-15° frontal
- Cal. 14.5 mm x 114 API @ 500 m horizontal all-around
- Cal. 7.62 x 51 mm AP (WC) @ 30 m horizontal all-around
surce:
http://www.steyr-ssf.com/pdfs/_2_Specifications_Ulan.pdf