Heavy Bolter Calibre

[Mazer Rackham]

Good day all.

 

As my Serch-Fu is garbage and my books have failed me,

 

Can someone pull from their Datavaults the calibre of a standard Astartes Heavy Bolter and translate it into the Ancient and Honourable Mechanicum Standard Millimetres?

 

Thanks in advance.

 

MR.

[Daylight]

Don't have the source on my person right now as I'm on mobile, but everywhere I've read says the heavy bolter is either .998 or 1.00 caliber, or 25.349/25.4 millimeters. I think I originally saw that in the Deathwatch rpg manual.

[Brother Dallo]

I have a vague memory of heavy bolter shells being described as being the size of a coke can, which is pretty metal, if you ask me.

 

Not sure if that's cannon though.

 

Dallo

[redmapa]

From the Forgeworld Horus Heresy normal bolters range from .60cal to .75cal and info from previous editions also put normal bolters and stormbolters as .75cal, now the Horus Heresy also put Heavy Bolters as .75cal, which is kind of weird when you have all the previous info. So my guess is Heavy Bolters will probably range from .75cal to  1.0cal or some other maximum calibre.

[Volt]

Good day all.

 

As my Serch-Fu is garbage and my books have failed me,

 

Can someone pull from their Datavaults the calibre of a standard Astartes Heavy Bolter and translate it into the Ancient and Honourable Mechanicum Standard Millimetres?

 

Thanks in advance.

 

MR.

The only known heavy bolter caliber is 1.00. Horus Heresy bolters were weaker, lighter calibers, and thus their heavy bolter sister-guns might have been lower calibers as well, but I don't recall Forge World ever stating the claibers for HH guns. 

[Mazer Rackham]

Much obliged for all the input - exactly what I wanted to know.

 

Thanks!

 

MR.

[RandomMarine]

 

 

Good day all.

 

As my Serch-Fu is garbage and my books have failed me,

 

Can someone pull from their Datavaults the calibre of a standard Astartes Heavy Bolter and translate it into the Ancient and Honourable Mechanicum Standard Millimetres?

 

Thanks in advance.

 

MR.

The only known heavy bolter caliber is 1.00. Horus Heresy bolters were weaker, lighter calibers, and thus their heavy bolter sister-guns might have been lower calibers as well, but I don't recall Forge World ever stating the claibers for HH guns.

Where are you getting that 30k bolters are of a lighter calibre than 40k bolters from? I am under the impression that bolters are from a STC so standardized since the DaoT

[Leif Bearclaw]

 

Where are you getting that 30k bolters are of a lighter calibre than 40k bolters from? I am under the impression that bolters are from a STC so standardized since the DaoT

 

Page 19 of Betrayal. It lists the Tigrus as .6 cal and the Phobos as .7 cal. Whereas '40k standard' (typically exemplified by the Godwyn) is consistently portrayed as .75 cal.

[Volt]

 

 

Good day all.

 

As my Serch-Fu is garbage and my books have failed me,

 

Can someone pull from their Datavaults the calibre of a standard Astartes Heavy Bolter and translate it into the Ancient and Honourable Mechanicum Standard Millimetres?

 

Thanks in advance.

 

MR.

The only known heavy bolter caliber is 1.00. Horus Heresy bolters were weaker, lighter calibers, and thus their heavy bolter sister-guns might have been lower calibers as well, but I don't recall Forge World ever stating the claibers for HH guns.

Where are you getting that 30k bolters are of a lighter calibre than 40k bolters from? I am under the impression that bolters are from a STC so standardized since the DaoT

 

There is literally no such thing as a standard bolter.

[RandomMarine]

 

 

 

Where are you getting that 30k bolters are of a lighter calibre than 40k bolters from? I am under the impression that bolters are from a STC so standardized since the DaoT

 

Page 19 of Betrayal. It lists the Tigrus as .6 cal and the Phobos as .7 cal. Whereas '40k standard' (typically exemplified by the Godwyn) is consistently portrayed as .75 cal.

I stand corrected

[rendingon1+]

I wouldn't say that lower caliber means "weaker"...

[Raven1]

That being said just because it's the "heavy bolter" doesnt mean it will be a larger caliber. For example both the M4 carbine and M249 light machine gun used by the US Army are both chamberes 5.56mm. To answer the mm question .75 is 19mm. As reference the m203 grenade launcher rifle attachment and mk19 automatic grenade launcher fire a 40mm grenade.

 

So the images in the art per usual are generally bigger than what you could expect to see for barrel size.

 

Last size reference is 5.56mm is equated with . 223 caliber.

[KhorneHunter57x]

That being said just because it's the "heavy bolter" doesnt mean it will be a larger caliber. For example both the M4 carbine and M249 light machine gun used by the US Army are both chamberes 5.56mm. To answer the mm question .75 is 19mm. As reference the m203 grenade launcher rifle attachment and mk19 automatic grenade launcher fire a 40mm grenade.

But that's the light machine gun, where the heavy machine gun used by the US military is chambered for .50cal/12.7mm, so I think it is fair to say that a heavy bolter would be a larger caliber based on real-world comparisons.

[Xenith]

That being said just because it's the "heavy bolter" doesnt mean it will be a larger caliber.

 

You realise we're talking about the Imperium, right?

 

Heavy will mean both physically larger and wider barrel. 

 

Heavy bolter shells are traditionally described as fist-sized.

[DuskRaider]

I could've sworn it was 1.77, but 1.00 sounds right. Hell, even using the standard Bolter caliber is plausible with the extra oomph coming from the faster rate hitting an area. Modern Light / Heavy Machine Guns use standard rounds as well (5.56x45mm or 7.62x51mm with a few exceptions). 

[Raven1]

 

 

That being said just because it's the "heavy bolter" doesnt mean it will be a larger caliber.

You realise we're talking about the Imperium, right?

 

Heavy will mean both physically larger and wider barrel.

 

Heavy bolter shells are traditionally described as fist-sized.

Even a 1.0 caliber round wouldn't fire something fist sized. A bolter basically fires a grenade. True luge size taking caliber or mm it would be about half the size of a "grown man's fist"

 

Then again im not sure why I'm getting so specific because I have seen them described as both "mini-rockets" which is fairly poor design abandoned in the 60s, and as having shells or casings that need to be ejected, so you know you really have to leave logic at home.

[Volt]

 

 

That being said just because it's the "heavy bolter" doesnt mean it will be a larger caliber.

You realise we're talking about the Imperium, right?

 

Heavy will mean both physically larger and wider barrel.

 

Heavy bolter shells are traditionally described as fist-sized.

 

Even a 1.0 caliber round wouldn't fire something fist sized. A bolter basically fires a grenade. True luge size taking caliber or mm it would be about half the size of a "grown man's fist"

 

Then again im not sure why I'm getting so specific because I have seen them described as both "mini-rockets" which is fairly poor design abandoned in the 60s, and as having shells or casings that need to be ejected, so you know you really have to leave logic at home.

 

 

Except it's coming back with a vengeance, albeit not rocket powered yet, but likely to be added.