10x46mm Caseless

I really have to give these a rest.


Anyway, more

Alright. New plan.
2 sets of loads. Same 46mm case.
The regular loads are a small step up from the 5.56 in terms of kinetic energy. The more powerful loads are comparable to the 7.62. The big difference being that the 5.56 power loads have their bullets recessed into the case almost completely, while with the 7.62 loads this isn't the case. The extra propellant that fits the case adds the extra oomph.



Service
Armor piercing, semi frangible ball

5mm, 3 gram
Hardened steel penetrator
Sectioned bismuth core
Thin tombac jacket
BC: 0.37

318mm barrel: 1157 m/s, 2008 Joules
384mm barrel: 1189 m/s, 2121 Joules
450mm barrel: 1222 m/s, 2240 Joules


A sort of sensible twist rate of 1-in-180mm-ish. Ballistically not as impressive at it used to be, but certainly better than most contemporary options (compared to an M855A1 at 940m/s, it beats it on all aspects on paper, besides recoil management and sectional density).
It's somewhat ballistically matched with the battle rifle load. At 400 meters it's dropped 1cm more. The AICOS sight is zeroed at 200m, up until that distance the difference in trajectory is less than 2mm (after that you have to take a bit more care).


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Marksman/Battle rifle load
Armor piercing, semi frangible ball

6mm, 6 gram
Hardened steel penetrator
Sectioned bismuth core
Tombac jacket
BC: 0.60

384mm barrel: 1050 m/s, 3308 Joules
450mm barrel: 1080 m/s, 3499 Joules
525mm barrel: 1105 m/s, 3663 Joules


Hard hitting, far flying, flesh tearing evil. Also 1-in-180mm twist rate. As far as ballistics go, it's somewhat comparably to the .300 Winmag.


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Short range
Semi armor piercing, frangible ball

7.62mm, 7.5 gram
Semi sintered steel penetrator
Compressed iron-tungsten powder core
Tombac jacket
BC: 0.22

318mm barrel: 727 m/s, 1977 Joules
384mm barrel: 746 m/s, 2087 Joules
450mm barrel: 768 m/s, 2212 Joules


Through a regular barrel these are massively over stabilized bullet, though this is only problematic at long range, which isn't this load's strong suit. The extra angular momentum makes these bullets close to explosive on impact.


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LMG
Armor piercing Tracer ball

7mm, 5.2 gram
Hardened steel penetrator
Bismuth core
Tombac jacket
Tracer compound
BC: 0.29

384mm barrel: 989 m/s, 2543 Joules
450mm barrel: 1017 m/s, 2689 Joules
525mm barrel: 1043 m/s, 2828 Joules


Despite being less aerodynamic than the service load, it's extra diameter adds to the round's suppressive effect (as in, it makes more noise when flying by, as such noise is related to the bullet's diameter).


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MMG load
Armor piercing Incendiary Tracer ball

7.62mm, 9.5 gram
Incendiary mix tip
Tungsten carbide penetrator
Powdered zircon skirt
Tracer compound
Tombac jacket
BC: 0.45


450mm barrel: 898 m/s, 3830 Joules
525mm barrel: 919 m/s, 4012 Joules
600mm barrel: 937 m/s, 4170 Joules


The regular MMG load isn't as complicated as this one, but it's ballistically identical, and I already did a steel tipped bismuth cored round. More than once.


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Slug load
Full bore, full metal jacket ball

10mm, 19.5 gram
Lead core
Open tip
Steel inner jacket
Tombac outter jacket
BC: 0.15

318mm barrel: 569 m/s, 3157 Joules
384mm barrel: 585 m/s, 3337 Joules
450mm barrel: 601 m/s, 3522 Joules