The catalogue record for .45 ACP places the cartridge’s introduction in 19051 and credits its design to John Browning. In the record, it is a rimless, straight cartridge with a brass case and a large pistol primer. Those basic descriptors matter because they define the cartridge’s mechanical form before any discussion of loads or firearms chambered for it.
The key dimensions in the catalogue set out that form in compact terms: bullet diameter 11.48 mm, case length 22.81 mm and cartridge overall length 32.39 mm. The pressure figure recorded alongside them is a maximum of 131 MPa, also published in the record as 19000 psi. Taken together, these figures describe the standard envelope within which the catalogue’s .45 ACP loads and chamberings sit.
This section covers three things the record shows clearly: the cartridge’s dimensions and pressure limits, the spread of recorded loads by velocity and energy, and the range of firearms chambered for it. The catalogue currently lists 811 firearms chambered for .45 ACP, which makes it a substantial chambering family rather than a record tied to one pistol pattern alone.
Case geometry and what it shows
From base to mouth, the .45 ACP record shows a 12.19 mm1 rim, a 12.09 mm base and a 12.01 mm neck. Those figures matter because they describe the cartridge’s form in measurable terms. The rim is only 0.10 mm2 wider than the base, which is consistent with the catalogue’s classification of the round as rimless. The base to neck change is 0.08 mm, so the case body remains close to one diameter along most of its length, matching the recorded straight case shape rather than a strongly tapered one.
That geometry places the .45 ACP firmly in the pattern of a straight-walled pistol cartridge. The bullet diameter is 11.48 mm, so the neck sits only 0.53 mm above bullet diameter, again indicating modest dimensional change rather than a pronounced shoulder or bottleneck form. In catalogue terms, this is a compact, rimless, straight brass case built around a large pistol primer.
The standard profile in the record is anchored by three typical figures: a 14.9 g bullet, 260 m/s3 muzzle velocity and 477 J4 muzzle energy. Taken together with the case dimensions, those numbers show what the catalogue treats as the baseline .45 ACP pattern: a large-diameter pistol bullet in a short straight case, operating at moderate recorded velocity and energy for the calibre.
Pressure and the catalogue load set
The catalogue records six .45 ACP loads, all referenced from a 127 mm3 barrel. They are:
- M1911 Ball, 253 m/s5 and 476.867 J4
- Federal American Eagle 230gr FMJ, 271 m/s1 and 547.135 J6
- Federal HST 230gr JHP, 271 m/s and 547.135 J
- Federal HST 230gr JHP +P, 290 m/s and 626.545 J
- Hornady Critical Defense 185gr FTX, 305 m/s and 558.15 J
- Remington Golden Saber 230gr Bonded JHP, 267 m/s and 531.103 J
Taken as a set, these figures show the range the catalogue currently holds for standard .45 ACP load records. Recorded muzzle velocity runs from 253 m/s for M1911 Ball to 305 m/s for the Hornady 185gr FTX, a spread of 52 m/s2. Recorded muzzle energy runs from 476.867 J to 626.545 J, a spread of 149.678 J.
That spread matters because it shows that one cartridge record, with a maximum pressure of 131 MPa, published as 19000 psi, still covers materially different load outcomes within the same catalogue entry. The figures support comparison at the load level, but they do not by themselves establish anything beyond these recorded velocities and energies. The chart below continues that approach by showing retained energy for M1911 Ball from 0 m to 500 m.
M1911 Ball: remaining energy to 500 m
From a 127 mm barrel at 253 m/s.
Source: GET /v1/ammunition/m1911-ball/ballistics
The data in this chart
| Distance (m) | Remaining energy (J) |
|---|---|
| 0 m | 477 |
| 50 m | 422 |
| 100 m | 375 |
| 150 m | 334 |
| 200 m | 299 |
| 250 m | 268 |
| 300 m | 241 |
| 350 m | 216 |
| 400 m | 193 |
| 450 m | 173 |
| 500 m | 155 |
How bullet weight shifts the recorded loads
The load table shows a clear split in bullet weight within this small catalogue set. Five of the six recorded .45 ACP loads use a 14.9 g1 bullet: M1911 Ball, Federal American Eagle 230gr FMJ, Federal HST 230gr JHP, Federal HST 230gr JHP +P and Remington Golden Saber 230gr Bonded JHP. One load differs, Hornady Critical Defense 185gr FTX, which is recorded with a 12 g bullet.
That lighter 12 g load is also the fastest in the set at 305 m/s from a 127 mm3 barrel. The five 14.9 g loads span 253 m/s5 to 290 m/s from the same 127 mm reference barrel. In other words, the lightest recorded bullet is 52 m/s2 faster than M1911 Ball and 15 m/s faster than the quickest 14.9 g entry, Federal HST 230gr JHP +P.
Energy does not follow the same order as velocity alone. The highest recorded muzzle energy in the set belongs to the 14.9 g Federal HST 230gr JHP +P at 626.545 J6, not to the lighter Hornady load, which is listed at 558.15 J. This is the useful point of the table: within the catalogue figures, lower bullet weight coincides with the highest recorded velocity, while the highest recorded energy remains with a heavier 14.9 g load.
Federal American Eagle 230gr FMJ: path relative to the line of sight to 500 m
From a 127 mm barrel at 271 m/s, zeroed at 25 m.
Source: GET /v1/ammunition/federal-ae-230fmj/ballistics
The data in this chart
| Distance (m) | Path relative to the line of sight (cm) |
|---|---|
| 0 m | -2 |
| 50 m | -7.1 |
| 100 m | -51.3 |
| 150 m | -141 |
| 200 m | -283 |
| 250 m | -483 |
| 300 m | -751 |
| 350 m | -1,095 |
| 400 m | -1,523 |
| 450 m | -2,047 |
| 500 m | -2,677 |
Firearms chambered for .45 ACP in this sample
In this sample, .45 ACP appears in both pistols and a submachine gun. The pistols are the Heckler & Koch USP, Ruger SR1911 Commander, Ruger SR1911 Standard, Glock 21 Gen4, Ruger SR1911 Target, Glock 30 Gen4 and Ruger SR1911 Competition. The non-pistol example is the M3 Grease Gun.
The recorded dimensions and capacities show how widely the cartridge has been used across different formats. At the compact end, the Glock 30 Gen4 is 177 mm7 long with a 96 mm barrel and a 10-round magazine. The Ruger SR1911 Commander is 197 mm8 long with a 108 mm4 barrel and 7 rounds. Full-size pistols in the sample include the Glock 21 Gen4 at 205 mm5 and 13 rounds, the Heckler & Koch USP at 195 mm and 15 rounds, and the 127 mm3 barrel Ruger SR1911 Standard, Target and Competition models, each 220 mm long with 8-round magazines.
The M3 Grease Gun sits apart in scale and role. Its record gives 757 mm9 overall length, a 203 mm barrel and a 30-round magazine. That matters because it shows the same cartridge chambered in platforms ranging from compact self-loading pistols to a wartime blowback submachine gun. Across these records, introduction dates run from 1943 for the M3 to 2019 for the SR1911 Competition.
Velocity across platforms in the catalogue sample
The chart below compares the recorded muzzle velocities for this .45 ACP sample, but it is important to read them as firearm records, not as results from one common test load. Within that limit, the spread runs from 244 m/s8 for the Ruger SR1911 Commander to 360 m/s4 for the Heckler & Koch USP, a difference of 116 m/s2.
Several patterns in the sample are straightforward. The M3 Grease Gun is recorded at 280 m/s9. Three 127 mm3 barrel SR1911 variants, the Ruger SR1911 Standard, Ruger SR1911 Target and Ruger SR1911 Competition, are each recorded at 260 m/s. The Glock 21 Gen4 is listed at 253 m/s5, and the Glock 30 Gen4 at 251 m/s.
Those figures show that the catalogue’s .45 ACP chamberings cover pistols and a submachine gun, across different barrel lengths and designs, with recorded velocities spread across 244 m/s to 360 m/s. They do not support a controlled like for like ranking beyond that. The empty weights of the Glock 30 Gen4 and Heckler & Koch USP are under review, so weight-based comparisons should be left aside here.
For the full cartridge record, see the catalogue page for .45 ACP.
Muzzle velocity, compared
The data in this chart
| Firearm | Muzzle velocity (m/s) |
|---|---|
| Heckler & Koch USP | 360 |
| M3 Grease Gun | 280 |
| Ruger SR1911 Competition | 260 |
| Ruger SR1911 Standard | 260 |
| Ruger SR1911 Target | 260 |
| Glock 21 Gen4 | 253 |
| Glock 30 Gen4 | 251 |
| Ruger SR1911 Commander | 244 |
Sources and methods
Footnotes
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GunSpec catalogue record for the .45 ACP, which cites en.wikipedia.org. In the API: calibers reference and ammunition reference. ↩ ↩2 ↩3 ↩4
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Method, comparisons: a difference is one catalogue figure minus another of the same kind, in the same unit. Comparisons. ↩ ↩2 ↩3 ↩4
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GunSpec catalogue record for the Ruger SR1911 Standard, which cites ruger.com, pewpewtactical.com, americanrifleman.org, blog.cheaperthandirt.com. In the API: firearms reference. ↩ ↩2 ↩3 ↩4 ↩5
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GunSpec catalogue record for the Heckler & Koch USP, which cites hk-usa.com, heckler-koch.com, old.weaponsystems.net, hk-usa.com. In the API: firearms reference. ↩ ↩2 ↩3 ↩4
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GunSpec catalogue record for the Glock 21 Gen4, which cites eu.glock.com, web.archive.org, americanrifleman.org, americanrifleman.org. In the API: firearms reference. ↩ ↩2 ↩3 ↩4
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Method, cartridge arithmetic: muzzle energy is half the bullet mass times the square of its velocity, from the load figures above. Cartridge arithmetic. ↩ ↩2
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GunSpec catalogue record for the Glock 30 Gen4, which cites us.glock.com, en.wikipedia.org. In the API: firearms reference. ↩
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GunSpec catalogue record for the Ruger SR1911 Commander, which cites ruger.com, americanrifleman.org, shootingillustrated.com, blog.cheaperthandirt.com. In the API: firearms reference. ↩ ↩2
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GunSpec catalogue record for the M3 Grease Gun, which cites militaryfactory.com, guns.fandom.com, warfarehistorynetwork.com, inetres.com. In the API: firearms reference. ↩ ↩2
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