FDF equipment changed at huge pace from 1950's to 1990's.Army changed from bolt action rifle toting infantry to assault rifle wielding army in 40 years.
Following eras could be identified with resort to infantry weapons. Infantry describes typical infantry unit while Others describes rear area personnel and supporting crew and equipment.
50's: boltaction rifles, LMGs, autoloaders, SMGs
60's: assault rifles+SMGs, modern LMG
70's: assault rifles, modern LMGs
80's and 90's: same but service introduction of 7.62x54R LMG for some troops
2001+: same but addition of rifle grenades
Watercooled medium machineguns were kept in units in 1950's but after that they have been used in defensive Local Force units only.
*Armored infantry carries 7.62x54R shooting LMGs compared to 7.62x39R firing LMGs found in normal squads.
**Introduction of extra firepower in term of assault rifles increases this 90's onwards.
Finnish infantry's anti-tank firepower depended heavily on all kinds of equipment starting from Panzerfausts and Panzerschreks and then using domestic recoilless rifles and augmented of LADs (Miniman, M52 LAW) and finally MADs (APILAS). Firepower increases depend heavily on increased number of mines and explosives, and increased issue of disposable weapons. AT doctrine was fairly defensive for infantry (their job is to defend) but was quite aggressive for AT hunter patrols. This is difficult to put in game but I'd suggest making Finnish Infantry stands in AT units as Infantry(AT) to depict their better equipment and more aggressive tactics.
50's: Panzerfaust and Panzerschreks
60's: SS5SS in service
70's: same in larger numbers + AT mine ambushes + Miniman
80's: same with more numbers + explosives + LAW (late 1980's)
90's: same as in 80's + APILAS (Jaeger Brigade 90 and other 90's brigade TOEs)
Major factor with artillery is ability to commit counterbattery fire. Finnish artillery was quite skilled in this in Continuation War but there has not been serious upgrade on technical issues on artillery until 1980's. The bottom line is that FDF artillery is flexible but equipment wise change did come in 1980's and thus 90's depicts also Jäeger Brigade 90 changes. 2001 depicts Prikaati 2005 that is in drawing board (should get all kinds of exciting toys including RPVs for arty and more arty recon systems). 7AR is probably conservative estimate for them.
Counterbattery ratings should be based on following:
50's: AR 4
60's: AR 5
70's: AR 6
80's: AR 6
90's: AR 7
2001: AR 7 or AR 8
81mm and 120mm Mortars should use generic NATO/WP data. Ammo has I and
S for both. All artillery have S and I rounds.