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264 Thor. The Thor is a strongbelted case of good capacity, basically a necked-down, sharp-shouldered 8mm Remington Magnum. It gives impressive velocities - like 3700 fps with 100-grain bullets, up to 3500 using 120-grainers, and almost 3400 with 140s.

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The slowest powder I found usable in this cartridge is called RVO-70 by its distributor, River Valley Ordnance Works, in Harvester, Missouri. This extruded RVO-70 (also known as HC 30) was manufactured for 25mm ammo and is slightly slower burning than most lots of IMR-5010. A heavily compressed load of 87 grains of this powder under a 140-grain Nosler in the 264 Thor produces about 3265 fps, but extraction is sticky. RVO-70 is also good with the 155-grain Sierra match bullet.