| 6.5×45mm MASSOR |
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| Type | Rifle |
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| Place of origin | Valduvia |
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| In service | 1956–present |
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| Used by | MASSOR |
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| Wars |
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| Designer | Valduvian Workers' Army |
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| Designed | 1953 |
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| Produced | 1954–present |
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| Case type | Rimless, bottleneck |
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| Bullet diameter | 6.71 mm (0.264 in) |
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| Neck diameter | 7.44 mm (0.293 in) |
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| Shoulder diameter | 10.90 mm (0.429 in) |
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| Base diameter | 11.30 mm (0.445 in) |
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| Rim diameter | 11.30 mm (0.445 in) |
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| Rim thickness | 1.50 mm (0.059 in) |
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| Case length | 45.00 mm (1.772 in) |
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| Overall length | 60.00 mm (2.362 in) |
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| Case capacity | 2.79 cm3 (43.1 gr H2O) |
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| Rifling twist | 200 mm |
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| Primer type | Large rifle |
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| Maximum pressure (C.I.P.) | 380.00 MPa (55,114 psi) |
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| Bullet mass/type |
Velocity |
Energy |
| 7.0 g (108 gr) |
870 m/s (2,900 ft/s) |
3,035 J (2,239 ft⋅lbf) |
|
| Test barrel length: 520 mm (20.472 in) |
The 6.5×45mm MASSOR, also known as 6.5×45mm Valduvian or simply 6.5×45mm, is a rimless bottlenecked intermediate rifle cartridge developed in Valduvia during the 1950s. It has been the standard service rifle chambering for the Valduvian Workers' Army since 1956, and was adopted as the MASSOR standard upon the organization's establishment in 1999. The cartridge is currently used in the Lielstraupe TŠ-90 and TBA assault rifles, as well as the TBA light machine gun.