From Imperial Armour volume five - The Siege of Vraks
page 18; Death Korps of Krieg Infantryman wrote:
Lucius pattern, no. 98 lasgun
... standard power pack unit, operating in the 21 megathules range. This is a higher charge than many of the more common lasgun patterns, and causes the powerpack to drain more rapidly than other lasguns. The powerpack is good for 25 shots. This lasgun is a singe shot weapon, and the weapon's internal fast discharge generator is placed under extra stress by the larger charge, reducing its recharge rate and slowing the weapon's rate of fire whilst increasing maintenance time.
The weapon's barrel includes additional heatsink rings to dissipate the heat of the barrel, which infamously gets very hot during sustained firing.
2 megathule ain't going to be THAT dramatic a difference in firepower, so this kinda just screws the idea that "megathule" means anything. (Forgeworld seems to have a history of just making stats up)
What it DOES seem to imply (which is implied in other novels, but its a further confirmation) is that lasgun modesl can vary in power accordign to design - some are alot more powerful than others, which can help explain discrepancies in some weapons.
This particular weapon, I would imagine, is probably designed along the lines of a "hotshot" lasgun (Hot-shotted long-las rifles in the uplifting primer have a ~20 shot capacity) - this is further confirmed by the "increased maintenance" bit. Ironically that WOULD imply a ~20 MJ "per shot" capacity or so, but I think that's coincidental.
This isn't the most insane "lasgun output" implied, though: the hot-shotted long las in later Ghosts novels will drain a hotshot pack in a SINGLE shot - that implies obscene levels of firepower (and probably would wreck most ordinary lasguns after only a few shots.)
So, if you get 25 21 megathules shots from a powerpack, you should get 27 shots from a 19 megathule range lasgun. Also implies that other pattern lasguns are semi- or full auto.
Most powerpacks are good for 40-60 shots, so unless 19 MT refers to a higher setting, that won't make a great deal of sense.
And its a safe bet that other weapons have faster fire-settings, because full auto is mentioned in alot of other sourcees.
page 42; Vraksian Renegade Militiaman wrote:
This particular autogun
is an Agrpinaa pattern, type III. It fires a long .825 calibre round, on either single shot, semi-automatic and fully automatic, with a cyclic rate of fire of 650 rounds per minute with a muzzle velocity of 820 metres per second. It takes both a 20 and a 30 round box magazine
Presumably 8.25mm calibre? The same style autogun is manufactured on Necromunda, used by House Escher, and latterly by Houses Orlock and Goliath.
well making some extrapolations of the rounds dimensions from its diameter and assumptions about composition, that thing would probably be equivalent to a M2 browning machine gun. Not something your standard guardsman could wield (only one of those uber-bulky ones like Bragg or Jurgen.) In trutht hat thing should probably be more of a "stubber" rather than an autogun (stubbers go up to 25mm)
Of course, depending on the composition of the round and how its shaped (and what its composed of.) it could be alot lighter. The large diameter would give it the ability to make a BIG hole in a target.
page 88; Death Korps of Krieg Grenadier wrote:
type XIV lasgun (heavy) ... firing in the 28 megathule range ...
The weapon includes an advanced sight ... incorporating x4 magnification and low-light infra-scope... The careful calibrations required to keep the sight functioning mean that they are often disabled on the field.
I don't see what's so extraordinary about that it would be hard to calibrate. The 3rd edition rules mentioned infra-scopes/mono sights as being a potential standard on Guard weapons, and even long-las seem to use something better without problems. Hell there was an "assault las" with a fairly sophisticated scope in "13th Legion" and it wasn't particularily temperamental. Hell, a targeter is probably more complex than the scope above.
page 116; Heavy Artillery wrote:
The Earthshaker is the Imperial Guard's standard artillery piece. It is a 132mm calibre weapon, capable of firing a 38kg shell over 15 kms at a velocity of 814mps... It uses its standard five power charges, but this can be increased with the addition of charges six and seven.
Basically a reiteration of earlier IA editions descriptions of the weapon. Performance-wise, it's not as godo as implied in other cases (other sources have given Basilisks ranges of tens of km - up to 100+ km in fact) and its perforamnce isnt as good as a 155mm howitzer (47 kg projectile at ~940 m/s for a Crusader 155mm) but there ARE a number of Earthshaker and Basilisk variants, some with other capabilites (higher ROF, some are bigger/more powerful, etc.) hell, the earlier IA stuff had it at 125mm and a MV of 425 m/s...
Russes, of course, have a much bigger/powerful cannon.. ironically (of course hte Basilisk is a Chimaera chassis..)