Lindcott Armory Compare / 12.7x81mmSR Vickers vs .55 Boys
Cartridge comparison
12.7x81mmSR Vickers vs .55 Boys
.55 Boys is faster (3,250 vs 2,640 fps); .55 Boys carries more energy (23,466 vs 14,518 ft·lb); 12.7x81mmSR Vickers recoils less.
12.7x81mmSR Vickers →Representative trajectory · 100 yd zero0–800 yd Open in Ballistic Compare ↗
.55 Boys →Representative trajectory · 100 yd zero0–1000 yd Open in Ballistic Compare ↗
| 12.7x81mmSR Vickers | .55 Boys | |
|---|---|---|
| Type | Rifle | Rifle |
| Introduced | 1925 | 1937 |
| Bullet ⌀ | 0.514″ | 0.565″ |
| Case length | 3.189″ | 3.899″ |
| Velocity | 2,520–2,640 fps | 2,950–3,250 fps |
| Energy | 9,347–14,518 ft·lb | 17,902–23,466 ft·lb |
| Max pressure | 45,000 psi | 68,000 psi |
| Recoil | 60–80 ft·lb | 70–90 ft·lb |
| Eff. range | 800 yd | 300 yd |
FAQs
- Is 12.7x81mmSR Vickers faster than .55 Boys?
- .55 Boys is faster — up to 3,250 fps versus 2,640 fps.
- Does 12.7x81mmSR Vickers hit harder than .55 Boys?
- .55 Boys carries more muzzle energy (23,466 vs 14,518 ft·lb).