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One of the diffusers went missing from my chronograph and it can be a bit temperamental without it.
Ideally, I'd load for this cartridge with Viht N140. Powder is very expensive here, so it helps to buy one type in bulk and load multiple calibres. It's quite similar to Varget and works very well in many modern and historic calibres.
There are a few interesting bullets available in Europe for 8X56R. I also saw an Australian company is now producing a bullet based off the one used with the original service cartridge.
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I think it was on the Hunter's Life forum, but there was a guy on a gun forum that was really into this cartridge and put up a lot of interesting data.
One of my reasons for interest in this cartridge is the potential for use with the round-nosed heavy bullets. One of the old reloading manuals (from the 1950s, IIRC, which called for using DuPont powders) had data for the parent 8X50R that would seem to indicate the potential to get a bullet like that to some pretty decent velocities, even in the carbines and short rifles. Imagine a 250-grain .33-calibre softpoint or dangerous game solid at over 2,200 fps. Could be a decent stopper, something that might even work well with bears.
Unfortunately, way too many recoil-shy people insist on recommending that people underload this cartridge, but I don't think that should be done. And from what I understand, you can get blowby if you reduce the charges as low as some people have done.
Also, which Aussie company are you talking about? Woodleigh? They make bullets in the right calibre but they are meant for use on cartridges like the .33 OKH or the .318 Westley-Richards, although they are coincidentally usable in the 8X56R. Those would include the roundnosed bullets I mentioned above. Or are you talking about a different company?
Service bullets for the older 8X50R used a 244-grain .323 bullet with an obturating base that acted like a driving band on an artillery projectile and gripped the rifling while the rest of the bullet just rode the bore. With the roundnose type bullets this means less wear and tear on the bore, but you can use full-bore projectiles like the Woodleighs as well. The 8X56R switched to full-bore boat-tailed spitzer 206-grain bullets like the ones on the OP.