The 243 is pretty popular with people on the land, and has been relegated to boring by the target cartridges now needed, or so everybody thinks from YouTube and glossy ads anyway.
I see more failures with the latest 6 and 6.5mm target cartridges and people who fall for numbers and incorrect projectile choices (experts don't do that, surely?!) that don't mean much, so those of you who want performance without the fancy ads and BS bragging are not in any way inferior with a 243. Don't listen to it, have a go and see for yourself. Your gear is fine as it is. Without the absolutely ridiculous cost of fad cartridge cases that people are terrified to lose. Or use.
So for those interested, here's the results of 2208 powder, cheap PPU cases and nothing-fancy WLR primers.
I got a few 100 packets of PPU cases from Cleavers for $29.90/100.
Picture has the info. Velocities in the 3350 range, not that quick but I find 2209 is a quicker-speed powder in the 243. Making these things go too fast for dogs is most likely not a problem.
These two groups were shot at twilight, 6.15pm and through this unreal scope you'd think it was lunchtime.

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The set-up. Cheap Meopta scope, 2-10x, see you can shoot tiny groups with a scope that actually has field of view and is bright as any on the market.
I suggest checking out The Barn, they bought all the distributors stock of the European-made Meoptas because Chinese scopes out here are not thought of kindly. Prices are incredibly good for Zeiss performance.
Home-made bench rest, made 25 years ago before those cheap spongy Lead Sleds were even invented. Made them for all my mates.
Home-made benchrest, from a throw-away box section frame that was for transporting cattle panels.
Top of warping pine sleepers, doesn't matter cost the benchrest has 3 feet.

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Everything homemade, target frames, targets from Weet-bix boxes inside-out, with cheap Ebay Shoot-N-See sticker spots to aim at.
All made from scrap, except the AR500 gongs, which I got off Ebay for half the gunshops price, posted to the big farm letterbox.

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So this post was about getting great performance with cheap yet awesome projectiles, super-cheap cases in a great forgotten cartridge that actually works, on home-made equipment. Hopefully spurs some on to have a go.
If I get time to try 2209 powder, I will put up the results, as I will if I get to drop a dog as well over Easter, which will be about relaxing.