How Muzzle energy is calculated
E = ½ · m · v²
Inputs
- m9.525 g147.0 grverifiedsourcePublished as 147 gr; 1 gr = 0.06479891 g exactly.
- v853 m/s2,799 fpsverifiedMeasured with a 558.8 mm barrel, not this arm's 330 mm. Velocity outside the sourced range is not projected.
1 of 2 inputs link to their source.
How Muzzle velocity is calculated
nearest sourced barrel length, no extrapolation
Inputs
- v at 558.8 mm853 m/s2,799 fpsverifiedsourceBallistics table of the cited article.
Assumptions
- This figure belongs to a 558.8 mm barrel. It is shown because it is the closest measurement that exists, not because it applies here.
1 of 1 inputs link to their source.
How Loaded mass is calculated
m_loaded = m_empty + m_magazine + n · m_cartridge
Not calculated: m_magazine has no sourced figure yet. Nothing is substituted for a missing input.
Assumptions
- One magazine, filled to the stated capacity. Spare magazines, optics, slings and lights are the owner’s, not the arm’s.
2 of 4 inputs link to their source.
How Free recoil is calculated
E_recoil = ½ · m_firearm · v_recoil²
Inputs
- m_firearm4 kg8.818 lbverifiedsourceFrom the specification table of B&T's APC308 datasheet (2020/04), APC308 column. Given as "weight empty ... with magazine".
- v_recoil2.031 m/s6.664 fpsestimated
Assumptions
- Propellant gas momentum is excluded: ARMAG does not record charge weights. This is therefore a lower bound on the real free recoil, consistent between entries but smaller than a figure that includes the gas term.
- Free recoil: the arm is unrestrained. Stock design, muzzle devices, stance and shooter mass are not modelled, because none of them is a property of the arm.
1 of 2 inputs link to their source.
How Capacity is calculated
as published for the primary chambering
Inputs
- capacity25verifiedsourceMagpul SR25/M110/AR10-pattern magazines in 10, 20 and 25 rounds; 25 is the largest.
1 of 1 inputs link to their source.
Derived figures
Computed from the sourced values above. Open ƒ on any figure for the formula, its inputs, and the assumptions it makes.
How Momentum is calculated
p = m · v
Inputs
- m9.525 g147.0 grverifiedsourcePublished as 147 gr; 1 gr = 0.06479891 g exactly.
- v853 m/s2,799 fpsverifiedMeasured with a 558.8 mm barrel, not this arm's 330 mm. Velocity outside the sourced range is not projected.
1 of 2 inputs link to their source.
How Sectional density is calculated
SD = mass(gr) / (7000 · diameter(in)²)
Inputs
- mass9.525 g147.0 grverifiedsourcePublished as 147 gr; 1 gr = 0.06479891 g exactly.
- diameter7.85 mm0.3091 inestimatedsourceNo free dimensional standard publishes the NATO round under that name. Borrowed from the C.I.P. datasheet for the commercial .308 Winchester (G1), which shares the chamber; the two are not interchangeable at the pressure limit.
Assumptions
- Reported in the conventional lb/in² so it is directly comparable with published figures.
2 of 2 inputs link to their source.
How Power factor is calculated
PF = mass(gr) · velocity(fps) / 1000
Inputs
- mass9.525 g147.0 grverifiedsourcePublished as 147 gr; 1 gr = 0.06479891 g exactly.
- velocity853 m/s2,799 fpsverifiedMeasured with a 558.8 mm barrel, not this arm's 330 mm. Velocity outside the sourced range is not projected.
Assumptions
- A competition classification defined by the IPSC and USPSA rulebooks, stated in their units. It describes a scoring category, not an effect.
1 of 2 inputs link to their source.
How Magazine dump is calculated
t = (n − 1) / (rpm / 60)
Not calculated: rpm has no sourced figure yet. Nothing is substituted for a missing input.
Assumptions
- Cyclic rate held for the whole magazine, no stoppages, trigger held down. A theoretical figure for comparing mechanisms, not a measured one.
1 of 2 inputs link to their source.
How Sight error at 1 mm is calculated
θ = atan(misalignment / sight radius)
Not calculated: sight radius has no sourced figure yet. Nothing is substituted for a missing input.
Assumptions
- Shows what a stated aiming error costs. The misalignment is the reader’s figure; the site does not claim how well anyone aims.
No input on this calculation carries a clickable source yet.
Variants
APC308 DMR
The longer-barrelled designated-marksman version.
- Mass, empty
- 4.6 kg10.14 lbsource
From the specification table of B&T's APC308 datasheet (2020/04), APC308 - DMR column. With magazine.
- Length
- 1,026 mm40.39 insource
From the specification table of B&T's APC308 datasheet (2020/04), APC308 - DMR column. Stock open.
- Length, folded
- 813 mm32.01 insource
From the specification table of B&T's APC308 datasheet (2020/04), APC308 - DMR column. Stock closed.
- Barrel length
- 480 mm18.90 insource
From the specification table of B&T's APC308 datasheet (2020/04), APC308 - DMR column.
| Variant | Years | Changes |
|---|---|---|
| APC308 DMR | — | Mass, empty, Length, Length, folded, Barrel length |
Specifications
Every row here is generated from the schema, so a figure recorded on this entry cannot be missing from the table, and the same rows, read the same way, are what the comparison shows.
Identity
- Type
- Carbine
- Action
- Self-loading
- Fire modes
- Semi-automatic
- Operating system
- Gas, short-stroke piston
- Designed in
- Switzerland
- Produced in
- Introduced
- 2016
- Production
- not recorded
Dimensions and mass
- Mass, empty
- 4 kg8.818 lbsource
From the specification table of B&T's APC308 datasheet (2020/04), APC308 column. Given as "weight empty ... with magazine".
- Magazine, empty
- not recorded
- Length
- 875 mm34.45 insource
From the specification table of B&T's APC308 datasheet (2020/04), APC308 column. Stock open.
- Length, folded
- 663 mm26.10 insource
From the specification table of B&T's APC308 datasheet (2020/04), APC308 column. Stock closed.
- Width
- 101 mm3.976 insource
From the specification table of B&T's APC308 datasheet (2020/04), APC308 column. Stock closed; 69 mm with the stock open.
- Height
- 199 mm7.835 insource
From the specification table of B&T's APC308 datasheet (2020/04), APC308 column.
- Barrel length
- 330 mm12.99 insource
From the specification table of B&T's APC308 datasheet (2020/04), APC308 column.
Sights and rifling
- Sight radius
- not recorded
- Sight height over bore
- not recorded
- Rifling twist
- 304.8 mm12.00 insource
One turn in 12 inches, right hand, as stated on the datasheet.
- Twist direction
- not recorded
- Grooves
- not recorded
- Sight graduation
- not recorded
Operation
- Cyclic rate
- not recorded
- Trigger pull
- not recorded
- Effective range
- not recorded
- Units produced
- not recorded
- Launch price
- not recorded
Chamberings
- 7.62×51mm NATOprimary25 rounds
Scale
A to-scale outline against family siblings. The dimensions are sourced; the shape is a representative outline for the type, and says so.
- B&T APC308875 mm34.45 in
Representative outline: the dimensions are sourced, the shape is not. Overall length, and barrel length where recorded, are drawn from this entry's own figures; the profile is a generic one for the firearm type and says nothing about this arm's actual contours.
Detail
The APC308 is the 7.62×51mm NATO member of B&T’s Advanced Police Carbine family, previewed in October 2016 for release early the following year. B&T presented it as the model that completed the family, giving a full-power rifle the same ergonomics and controls as the pistol-calibre APC9 and the 5.56mm APC556, and like the APC556 it is gas-operated, with a short-stroke piston, rather than blowback.
The maker’s datasheet lists it as semi-automatic only, in two versions: a carbine with a 330 mm barrel and a designated-marksman version with a 480 mm barrel, both cold-hammer-forged in Germany with a one-in-twelve-inch twist chosen to suit a wide range of bullet weights. The upper receiver is machined from solid alloy with its top and bottom rails cut into it rather than bolted on, the gas block has a setting for use with a suppressor, and the rifle feeds from SR-25-pattern magazines. Its folding stock folds to the right and the rifle can be fired with it closed.
Every figure on this page comes from B&T’s own datasheet, read through a permanent archived copy. Its mass figures are stated with a magazine fitted. The datasheet gives no muzzle velocity, and no photograph of this model with a free licence could be found.
References
This entry's own bibliography. Every citation key on this page resolves into this list.
- Brügger & Thomet APC · Wikipedia · 1373702344 · read 2026-09-24 · CC BY-SA 4.0
- APC308 7.62 x 51 mm (.308 Win) (datasheet 2020/04) · B&T AG · read 2026-09-24
- PREVIEW: The New B&T APC308 · The Firearm Blog · read 2026-09-24
Last verified 2026-09-24 · review status: draft