Nightshade24, on 13 July 2016 - 08:12 AM, said:
8) I remember reading up on battletech cannons and how they perform nearly identical to quite a lot of naval guns.
It's a bit of both.
Depends on the manufacturer, the caliber, the category, and some other things.
Lighter calibers with low categories tend to be akin to the Gau-38 on an A-10, which is 30mm. (Machine guns get that big and the Gain is several tons when encompassing the entire mechanism.)
High caliber, low category such as an AC/2 are horrifically slow firing cannons. 90mm is about as front loaded as you get and it's still not really one shot for 2 damage.
Low caliber, high category like a Pontiac (any as they all seem to be ammo eating Gatling guns but in this case an AC/20) will chew through a 100 cassette (magazine) in incredibly short order and at the risk of high risk of jamming can cram a second cassette out. That's the limit in Battletech tabletop but lore-wise you could jam a third through before 8 seconds but the barrels themselves would melt if they haven't already.
High caliber, high category weapons like the Chemist Gun and Tomodzuru cram everything into 4-5 heavy shells to net their 20.
Meanwhile the typical, near universal caliber is 120mm, which (with few exceptions in some authors) is usually described akin to an A1 Abrams with varying degrees of rapid fire.. thus, pretty much a naval gun.
Side note:
AMS is a Gatling gun on a turret. Laser AMS is a small laser on a turret.
And the only sample of a Heavy Rifle so far (which is said to be based on tanks from the 20th century) is sporting a 190mm round, which by itself does 9 damage to structure or anything with a Barrier Armor Rating of 7 or less. Against mech armor, tank armor, or anything with a B.A.R. of 10, it does 6 damage to.
That's the power of a single shell at 190mm, 6 damage. So a Chemjet Gun AC/20 dealing 5 damage per shell with 4 shells with 185mm ammo? Seems to fit quite well. Range, as Battletech points out time and time again is accurate range of expectancy, "we expect a gunner of even green quality to nail this shot with no undue difficulty. Then each bit of skill allows you to extend that range as your skill counter acts the penalty of "difficulty", your potential is practically amazing since all ACs have a real range of 1 to 2 kilometers. Difficulty keeps it in check.
Side note:. Long Tom has a shell of somewhat under 200 lbs. It does 30 damage in 6 lots of 5 in 30 meters of impact. At 60 meters from impact it does 20 in split lots. At 90 meters it does 10 damage.
PGI has Gauss Slugs at about the same weight (10 per ton), it only does 15. BT only gives 8 per ton, making them over 200 lbs.
PGI has IS AC/20 at 7 per ton. Only does 20 damage. Battletech has the same weapon system with 5 rounds, noting that in multiple sources that "rounds" is the ammo storage monitor display for Cassettes or Reloads, which can have lots of in the case of autocannons caps off at "up to 100 shots per ton".
Pretty much, MWO's given us a Long Tom to dual wield on our Jagermech with the damage just short of an Arrow IV. Pretty disappointing for a dakka lover like me.