| .275 No 2 Magnum | |
| Origin: | United Kingdom |
| Type: | Rifle |
| Designer: | John Rigby & Company |
| Design Date: | 1927 |
| Production Date: | 1927–present |
| Parent: | .375 Flanged Nitro Express |
| Case Type: | Rimmed, bottleneck |
| Bullet: | .284 |
| Neck: | .318 |
| Shoulder: | .450 |
| Base: | .510 |
| Rim Dia: | .582 |
| Case Length: | 2.5 |
| Length: | 3.26 |
| Case Capacity: | 75.2 |
| Primer: | Berdan 217 |
| Bw1: | 140 |
| Vel1: | 2675 |
| En1: | 2230 |
| Balsrc: | "Barnes."[1] |
The .275 No 2 Magnum, also known as the 7mm Rigby Magnum Flanged and the .275 No 2 Rigby, is an obsolete centerfire rifle cartridge developed by John Rigby & Company in 1927.
The .275 No 2 Magnum is a rimmed cartridge intended for use in double rifles. Rigby introduced the .275 No 2 Magnum by necking down the .375 Flanged Nitro Express,[2] it was still available in the early 1960s.[1] The .275 No 2 Magnum's performance is comparable to the .275 Rigby.[1]
As is common with cartridges for double rifles, due to the need to regulate the two barrels to the same point of aim, the .275 No 2 Magnum was offered in one loading, firing a 140gr bullet with a listed speed of 2675ft/s.[1]
In his African Rifles and Cartridges, John "Pondoro" Taylor rated the .275 No 2 Magnum as his favourite of all the small bore cartridges.[3]