To calculate accuracy multiply by veterancy bonus +100% to base accuracy of gun, round down to whole number and then multyply by sum of all other bonuses +100%.
Round down to whole number. Applies first before sum of other bonuses.

Intermediate values calculated with linear interpolation.
Stacks with every shot on target. Resets on losing line of sight or switching to another target/
For AP rounds max bonus is: +3
For HE rounds max bonus is: +7
For everything else: +8

Penetration chance calculated by 2d10 roll.

Formula is a bit too complex so here is table (AP\Distance sheet)[docs.google.com].

On average big calibers lose about 33%,
medium ~45%. Since v45508 APCR have same drop off as AP rounds
APCR ~60% effectivness.
In most cases APCR becomes less effective than AP at ~1700m range.

All vehicles have hidden HP bar.
Light tanks 8 HP: STAGHOUND Mk. I, STAGHOUND Mk. II, 38M TOLDI I, 38M TOLDI II, 38M TOLDI II PK., 38M TOLDI IIA, 39M CSABA, 40M CSABA FAO (105mm), 40M CSABA PK., 75mm SP AUTOCAR M3, AB 247, AB USOR, ACV_IP_AOP, ACV_IP_Mk2A, AEC Mk.3, AM-M8 RBFM, AM-M8 RFM, AM-M8 SPAHIS, AS42_20mm, AS42_MG, AUFK.-PANZER 38(t), AUFK.-PANZER 38(t) FÜH., AUFK.PANZER 742(r), Autoblinda_41, Autoblinda_43, Autoblinda_43_47mm, BA-10M, BA-10M BTR, BA-20, BA-20V KOMBAT, BA-64B, BA-64B KAO (180mm), BAF B (PKOM), BAF C, BASh-64, BEF. PANZER II C, BEO.PZ. 38H(f) (172,5mm), BEO.PZ. IIC (172,5mm), BM-8-24 82mm, BORGWARD IV, BT-7, CHAR CMD M3A3, CHAR M5A1, CMD M5A1, CMD M8, CMD TETRARCH, CV33_Mod34, CV33_Mod34_ATR, CV33_Mod34_CMD, CV33_Mod34_LF, FAMO_88mm, GEPARD, GRILLE, H39, HONEY STUART, HUMBER Mk.4, HUMMEL 150mm, Humberette, L6, LORRAINE(f) 105mm, M12 GMC 155mm, M13_40, M14/41, M14_41, M15_42, M18 HELLCAT, M18_Hellcat_reco_US, M3A3 RFM, M3A3 SPAHIS, M3L KOMROTI, M3_GMC_reco, M4 HST, M5A1, M5A1 RECON, M5L, M8, M8 CAVALRY, M8 SCOTT, M8_Greyhound, MALAXA U.E., MARDER II FÜH., MAULTIER VIELFACHWERFER 82mm, MORRIS LRC, NAG 4500 37mm, OBUSIER M8, PANHARD MG, PANZER 35R(f), PANZER 35S(f), PANZER 35S(f) FÜH., PANZER 39H(f), PANZER 7TP(p), PANZER I B, PANZER II C, PANZER II LUCHS, PANZER II LUCHS FÜ., PANZER L6(i), PANZER M14(i), PANZER T-26C(r), PANZER T-60(r), PANZER T-70(r), PANZERWERFER 150mm, PIKKU-SOTKA (PKOM), PZH. 39H(f) 105mm, Panzer_38t, Panzer_II_F, R-2, R-35, R-35 COMANDA, R-VIELFACHWERFER 82mm, R35, REIHENWERFER 81mm, S307(f) PAK, S35 PK., SDKFZ 11 DRILLING, SDKFZ 11 FLAK, SDKFZ 135/1 150mm, SDKFZ 247B, SDKFZ 261, SDKFZ 263, SEXTON 87.6mm, SPW 202(r), SPW 203(r), SPW 203(r) ROA, SPW 204(f), SPW 204(f) CDM, SPW 231, SPW 232, SPW 233, SPW 234/1, SPW 234/2 PUMA, SPW 234/3, SPW AB 41, SPW ADGZ, STUART V, STUART V DOW., STUART V ZWIAD., SU-76P, Semovente_47_32, Semovente_47_32_Comando, Semovente_M41_Comando, Somua_S35, Stuart_M3A3, Stuart_M5A1, Stuart_M5A1_50, Stuart_M5A1_Command, T-26 KOMROTI, T-26B, T-26C, T-26C (KPÄÄL), T-26E, T-38, T-60, T-60 RAZVEDKA, T-70, T-70 DOW., T-70 KAO (76,2mm), T-70 KOMROTI, T-70 RAZVEDKA, T-80 RAZVEDKA, TETRARCH, TETRARCH LITTLEJOHN, Toldi_II, VK18.01, VK9.01, VÂNĂTORUL DE CARE R-35, WESPE 105mm, WURFRAHMEN 35H(f) 280mm

M7 with own hp for some reason 9 HP:M7 HMC 105mm, OBUSIER M7 105mm, PRIEST 105mm, PRIEST DD, Priest

Medium tanks 10 HP:36/40M NIMRÓD, 40/43M ZRINYI II, 40M TURÁN I, 40M TURÁN I PK., 41M TURÁN II, 41M TURÁN II PK., ?, ACHILLES, ACHILLES IIc, AUFK. PANZER III M, AUFK.PANTHER D, AUFK.PANZER IV J, AVRE, BEF. PANTHER A, BEF. PANZER 38(t), BEF. PANZER III H, BEF. PANZER III K, BEF. PANZER IV H, BEF. STUG III F, BEO.PZ. III H (105mm), BEO.PZ. III H (150mm), BEO.PZ. III H (172,5mm), BEO.PZ. IV H (105mm), BEO.PZ. IV H (172,5mm), BERGEPANTHER, BEUTE FIREFLY, BT-42, CENTAUR IV, CHALLENGER, CHAR CMD M4A2, CHAR CMD M4A3(75), CHAR CMD M4A4, CHAR M4A2, CHAR M4A3(75), CHAR M4A3(76), CHAR M4A4, CHURCHILL IV, CHURCHILL IV CMD, CHURCHILL OP (140mm), CHURCHILL V, CHURCHILL VI, CHURCHILL VI CMD, CHWAT, CMD CROMWELL IV, CMD M4A1, CMD SU-76M, CROCODILE, CROMWELL IV ZWIAD., CROMWELL V, CROMWELL V DOW., CROMWELL V SZTAB., CROMWELL VI, CROMWELL VII, CROMWELL VII SZTAB., CRUSADER AA Mk.1, CRUSADER AA Mk.2, CRUSADER AA Mk.2B, Cromwell_IV, Cromwell_IV_CO, Cromwell_IV_Cmd, Cromwell_VIII, Cromwell_VII_bis, Cromwell_VII_bis_CMD, Crusader_AA_Mk2, EMCHA, EMCHA KOMROTI, FIREFLY Ic, FIREFLY Vc, FLAKPANZER PANTHER, FLAKPANZER T-34(r), FLAMMPZ. B2(f), Hetzer, JAGDPANZER 38(t), JAGDPANZER 38(t) FÜH., JAGDPANZER IV, JAGDPANZER SU-76(r), KAMPFPANZER III(e), KV-1E KAO (203mm), KV-1S KOMROTI, KV-8S, KhT-130, LANDSVERK ANTI-II, M10, M10A1 DESTROYER, M10A1_Wolverine, M3S, M3S KOMROTI, M4(105), M4(75) COMMANDANT, M4(75) COMMANDER, M4A1, M4A1 OP (155mm), M4A1 RHINO, M4A1(76), M4A1(76) CMD, M4A1_76, M4A2 OP (155mm), M4A3(105)W, M4A3(75) SPAHIS, M4A3(75)W, M4A3(W) CALLIOPE 114mm, MARDER I, MARDER II, MARDER III, MARDER III M, MATILDA II, MATILDA IV CS, MUNIWAGEN PZ. III, MUNIWAGEN T-34(r), MÖBELWAGEN, NASHORN, NASHORN FÜH., NELONEN, Nimrod, OBUSIER M4, OBUSIER M4A3, OT-34, P26_40, PANTERA G, PANTHER A, PANTHER A FÜH., PANTHER D, PANTHER D FÜH., PANTHER G, PANTHER G FÜH., PANZER B2(f), PANZER III G, PANZER III H, PANZER III H FÜH., PANZER III J, PANZER III L, PANZER III M, PANZER III N, PANZER IV C, PANZER IV F1, PANZER IV G, PANZER IV G PK., PANZER IV H, PANZER IV H FÜH., PANZER IV J, PANZER M4-748(a), PANZER T-34-41(r), PANZER T-34-41(r) FÜH., PANZER T-34-41(r) RONA, PANZER T-34-42(r), PANZER T-34/85(r), PANZER V/IV FÜH., PZ.JÄGER 35R(f), Panther_A, Panzer_III_M_Flamm, Panzer_IV_H_Fu, RAM II COMMANDER, RAM II OP (140mm), SHERMAN III, SHERMAN III CMD, SHERMAN III CO, SHERMAN III DOW., SHERMAN Ib, SHERMAN V, SHERMAN V C.O., SHERMAN V CMD, SHERMAN V DD, SHERMAN V DD CMD, SHERMAN V OP (140mm), SHERMAN V POA (140mm), SHERMAN V SZTAB., SOTKA 76, SOTKA 85, STUG III E, STUG III F/8, STUG III G, STUG III G FÜH., STUG IV, STUG IV FÜH., STUH 42, STURMI, STURMI (KPÄÄL), STURMPANZER IV, STURMPANZER KV-2(r), STURMTIGER, SU-122, SU-152, SU-75, SU-76I, SU-76I KOMROTI, SU-76M 76.2mm, SU-76M CMD 76.2mm, SU-76M PPANC., SU-76M PT, SU-85, SU-85 CMD, SU-88, SU_76I_Bef, SU_85, Semovente_M41_90_53, Semovente_M42_75_18, Semovente_M42_75_34, Semovente_M43_105_25, Sherman_IC_Firefly, Sherman_M4A2, Sherman_M4A4, Sherman_M4A4_CO, Sherman_M4A4_Cmd, Sherman_M4A4_Recce, Sherman_M4_105, Sherman_M4_CO, Sherman_M4_Cmd, StuG_III_G_Fu, T-28E, T-3, T-34 DE CAPTURA, T-34/76 DOW., T-34/76 KOMROTI, T-34/76 MODEL 1941, T-34/76 MODEL 1943, T-34/76 RAZVEDKA, T-34/76 obr.1942, T-34/76 obr.1943, T-34/85 KOMBAT, T-34/85 KOMROTI, T-34/85 RAZVEDKA, T-34/85 obr.1943, T-34/85 obr.1944, T-34E, T-38 COMANDANT, T-38 PK., T-4, T-5 PANTERA, T.4, T.4 CERCETARE, T.4 COMANDA, T.4 COMANDANT, T.A., T.A. COMANDA, T34_76_obr_41_CMD_EstSOV, TACAM R-2, TACAM T-60, TD M10A1, TD M10A1 RBFM, TD M10A1 RCA, Turan_1, Turan_1_CO, Turan_2, VALENTINE III, VALENTINE IX, VALENTINE KOMROTI, WIRBELWIND, WOLVERINE, Zrinyi_II, Zrinyi_II_CMD

Heavy Tanks 12 HP:BEF. TIGER, BEF. TIGER (P), BEUTE STALIN, CHURCHILL VII, ELEFANT, IS-1 KOMROTI, IS-2 KOMROTI, IS-2 obr.1943, IS-2 obr.1944, ISU-122, ISU-122 CMD, ISU-122S, ISU-152, ISU-152 CMD, JAGDPANTHER, JAGDPANZER 38(t) FÜH., KLIMI, KV-1E, KV-1S, KV-85, KW-1, KW-85, KÖNIGSTIGER (H), KÖNIGSTIGER (P), M4A3E2 JUMBO, PANZER KV-IA(r), T-6 TIGR, TIGER, TIGER E, TIGER E FÜH., TYGRYS, Tiger_E_CMD


Halftracks(transport): 7-6 HP

Every hit with penetration does shell damage + random critical effect(some of them adds 2 more damage).
Bounces does no damage but have chance to add critical effect.

Here is table (Critical Hits sheet)[docs.google.com]