grapyl's realistic round values (GRRV)

Real round penetration divided by 50 and at the end rounding it up
examples:
140mm ÷ 50 = 2,8 ~ 3ap
100mm ÷ 50 = 2 = 2ap

90mm:
1958 - T65 200mm 4AP
1961 - M348 270mm 5AP

105mm:
1973 - M728 300mm 6AP
1978 - M735 410mm 8AP
1980 - M774 440mm 9AP
1983 - M833 490mm 10AP
1989 - M900A1 650mm 13AP (M68A1/M68A1E4 only)

120mm:
1984 - M829 540mm 11AP
1989 - M829A1 700mm 14AP
1990s - XM866 800mm 16AP (XM291 only)
1991 - KE-W 630mm 13AP
1994 - M829A2 740mm 15AP
1999 - KE-W A1 670mm 13AP
2003 - KE-W A2 700mm (L/44) 14AP 740mm (L/55) 15AP
2006 - M829A3 800mm 16AP
2016 - M829A4 880mm 18AP (SEP v3/v4/XM360 only)
2022 - KE-W A4 740mm (L/44) 15AP 800mm (L/55) 16AP

140mm:
1990s - XM964 1000mm 20AP

152mm:
1965 - XM578E1 380mm 8AP

105mm:
1961 - L36A1 APDS 270mm 5AP
1973 - L52 APDS 300mm 6AP
1983 - L64A4 APFSDS 410mm 8AP

120mm:
1965 - L15 APDS 390mm 8AP
1985 - L23A1 APDS 500mm10AP
1991 - L26A1 APFSDS 555mm 11AP
1999 - L27A1 APFSDS 660mm 13AP
2001 - L28A1 APFSDS 685mm 14AP

105mm:
1973 - L52 APDS-T 300mm 6AP
1978 - DM23 390mm 8AP
1984 - DM33 450mm 9AP
2000 - DM63 530mm 10AP

120mm:
1979 - DM13 470mm 9AP
1983 - DM23 520mm 10AP
1987 - DM33 540mm (L/44) 11AP 630mm (L/55) 12AP
1995 - DM43 670mm (L/44) 13AP 730mm (L/55) 15AP
1999 - DM53 740mm (L/44) 15AP 800mm (L/55) 16AP
2005 - DM63 740mm (L/44) 15AP 800mm (L/55) 16AP
2019 - DM73 830mm 17AP (L/55A1 only)

130mm Rh130/L52:
2025 - 130 G APFSDS AG 1000mm 20AP

90mm:
1979 - OFL 90 F1 270mm 5AP

105mm:
1981 - OFL105 F1 390mm 8AP
1987 - OFL105 G2 490mm 10AP
1987 - OFL105 G3 470mm 9AP
1995 - OFL105 F2 530mm 11AP

120mm:
1981 - OFL120 G1 440mm 9AP
1992 - OFL120 F1 600mm 12AP
1996 - OFL120 F2 700mm 14AP
2021 - SHARD mk1 120mm 770mm (L/44) 15AP 810mm (L/55/52) 16AP
2024 - SHARD mk2 120mm 860mm (L/44) 17AP 900mm (L/55/52) 18AP

140mm:
1996 - OFL 140 F1 820mm 16AP (Leclerc T4 only)
2024 - SHARD 140mm 1100mm 22AP (ASCALON 140 only)

100mm:
1966 - 3BM8 310mm 6AP
1972 - 3BM20 300mm 6AP
1978 - 3BM25 330mm 7AP

115mm:
1961 - 3BM3 270mm 5AP
1965 - 3BM21 320mm 6AP
1978 - 3BM28 440mm 9AP
1988 - 3BM36 560mm 11AP

125mm:
1962 - 3BM9 290mm 6AP
1968 - 3BM12 315mm 6AP
1972 - 3BM15 400mm 8AP
1976 - 3BM22 470mm 9AP
1982 - 3BM29 500mm 10AP
1983 - 3BM26 490mm 10AP
1985 - 3BM32 560mm 11AP
1986 - 3BM42 500mm 10AP
1991 - 3BM46 650mm 13AP
2016 - 3BM60 700mm 14AP (2A46M-4/5 only)
2016 - 3BM59 740mm 15AP (2A46M-4/5 only)
2015 - 3BM70 890mm 18AP (2A82-1M only)
2015 - 3BM69 970mm 19AP (2A82-1M only)

152mm:
2005 - Grifel 2 1040mm 21AP
2005 - Grifel 1 900mm 18AP

120mm:
2005 - PZ-531 730mm (L/44) 15AP 790mm (L/55) 16AP

125mm:
2002 - Ryś 540mm 11AP

105mm:
1978 - M111 390mm 8AP
1984 - M413 450mm 9AP
1987 - M429 490mm 10AP
1990 - M426 550mm 11AP

120mm:
1989 - M321 560mm 11AP
Late 1990's - M322 680mm (L/44) 14AP 740mm (L/55) 15AP
2005 - M338 740mm 15AP

125mm:
2000 - M711 450mm 9AP
2002 - M711/8 Mk2 620mm 12AP

90mm:
1977 - NR-320 260mm 5AP (High pressure guns only)
1982 - M690 300mm 6AP (High pressure guns only)
1985 - M652 210mm 4AP (Low pressure guns only)
1986 - M690A1 330mm 7AP (High pressure guns only)
1986 - M652A1 270mm 5AP (Low pressure guns only)
90mm:
1984 - K241 300mm 6AP

120mm:
1996 - K276 640mm 13AP
2014 - K279 760mm 15AP
2016 - K279 (I) 780mm 16AP

100mm:
1990 - DTW2-100 300mm 6AP

105mm:
1978 - DTW1/M111 390mm 8AP
2006 - DTW2 460mm 9AP
2010 - BTA2 550mm 11AP

120mm:
1989 - PTZ89 II 510mm 10AP

125mm:
1993 - 125-I 560mm 11AP
1999 - 125-IIM/DTW-125/BTA4 670mm 14AP
2010 - DTC10-125 710mm 14AP
2021 - DTC201-125 760mm 15AP

MG have accurate penetration, unlike AP
0.0369 of steel = 1MG with 1 barrel

57mm S-60
2012 - 61MG (APFSDS) 3UBM22 (BM57 only)
1950 - 29MG (AP) UBR-281/281U

50mm XM913
2019 - 56MG (APFSDS) XM1203 "Super 50"

40mm Bofors L/70
2005 - 47MG (APFSDS) Slpprj 90LK/05
1997 - 40MG (APFSDS) Slpprj 90LK/97
1993 - 40MG (APFSDS) Slpprj 90

40mm 40CT
2016 - 45MG (APFSDS) 40-APFS-DS-T

40mm Bushmaster IV
2001 - 48MG (APFSDS) "Super 40"

35mm Bushmaster III
2007 - 39MG (APFSDS) NM251
1998 - 37MG (APFSDS) NM241

35mm Oerlikon GDF
1989 - 35MG (APFSDS) PMD 060
1989 - 31MG (APDS) PMD 049
1982 - 31MG (APDS) DM23
1973 - 18MG (AP) DM13

30mm MK 30-2/ABM
2019 - 38MG (APFSDS) PMC 359

30mm Mk44 Bushmaster II
2004 - 36MG (APFSDS) MK258 Mod 1 "Swimmer" (USA only)
1990 - 33MG (APFSDS) NM225/MK258/PMC 287
1977 - 16MG (AP) PGU14/B (for aircraft use)

30mm L21A1 RARDEN
1990 - 22MG (APDS) L14A3
1986 - 17MG (APDS) L14A2
1984 - 15MG (APDS) L14A1

30mm 2A42/2A72
2016 - 15MG (AP) 3UBR10
2016 - 28MG (APFSDS) 3UBR11 (Round not in service, use only for fictional purposes on 2A42 after modification from 2021[patenton.ru])
1994 - 22MG (APDS) 3UBR8 (2A72 only, unless modification from 2021[patenton.ru] is done on 2A42)
1980 - 15MG (AP) 3UBR6

25mm GAU-12/22 Equalizer
1993 - 12MG (AP) PGU-32/U SAPHEI-T
1985 - 18MG (AP) PGU-20/U API

25mm M242 Bushmaster
1994 - 27MG (APFSDS) M919
1984 - 16MG (APDS) M791

23×152mmB 2A7
1964 - 12MG (AP) BZ API
2008 - 16MG (APDS) APDS-T (Poland only)

20mm Rh-202
1989 - 22MG (APDS) DM63
1972 - 15MG (AP) DM43

20mm M61/M197
1990 - 4MG (AP) M940 MPT-SD (anti air purposes)
1968 - 18MG (APDS) MK149
1957 - 11MG (AP) M53 API-T

14.5mm KPVT
7MG B-32 API

12.7mm M2/DShK/NSVT
6MG M2 ball/B-32 API

.30-06/7.62x51/54r AP
4MG M2 AP/M61/B32 API

7.62x51/54r M240C/PKT/MG3A1
3MG 57-N-323S/M62

5.56x45/5.45x39 M16/AK-74
2MG SS109/7N6

Level 1 - 2MG point blank
Level 2 - 3MG point blank
Level 3 - 4MG point blank
Level 4 - 7MG at 200 meters
Level 5 - 16MG at 500 meters
Level 6 - 33MG at 500 meters

1HMG - 7MG
2HMG - 13MG
3HMG - 20MG
4HMG - 27MG
5HMG - 34MG
6HMG - 40MG
7HMG - 47MG
8HMG - 54MG
9HMG - 61MG
10HMG - 67MG
11HMG - 74MG
12HMG - 80MG
13HMG - 87MG
14HMG - 94MG
15HMG - 101MG




1HMG - 6MG
2HMG - 11MG
3HMG - 17MG
4HMG - 22MG
5HMG - 28MG
6HMG - 33MG
7HMG - 39MG
8HMG - 44MG
9HMG - 50MG
10HMG - 56MG
11HMG - 61MG
12HMG - 67MG
13HMG - 72MG
14HMG - 78MG
15HMG - 83MG