I shoot the 75 Gr V Max in my 6MM does a good job not bad hole and slowing it down to 243 vel I would think it would be fine. I would be a bit concerned of the lighter bullets under 70grn your barrel may not shoot those well dependent on twist rate. My rifles realy like IMR 4350 it's old school but so are most my rifles.
When I could shoot lead bullets at coyotes the 75 gr V-Max bullets were my favorite. I reloaded them with 39.0 gr of IMR-4064 in my 243 Win ammo. I didn't get many exit holes but when I did, it wasn't pretty.
Not what you were after but a while back I bought some federal ammunition and they used 70 grain SPEER TNT hollow points. They have worked great but don't have a load for you but work something up around this bullet. Box says velocity is 3400 ft per second. Let me know I am almost out and will have to reload myself they don't make it anymore.
I shoot 70gr Nosler Ballistic tips moving at around 3690fps. devastating results, also it may vary from where I live to where you live but a $7-$10 coyote pelt I wouldnt worry much about tearing them up, shoot to kill!!!! Just ordered a new Savage 12VLP DBM in .243 today, I hope they have it in stock!!! Should be a tack driver!!
I like the Ballistic tip 70gr also over a near max load of IMR4350...but when a lot of shooting is involved I load the 80gr Rem Core-lokt bulk bullet over H414..very accurate and economical and not real destructive when only driven at around 3200fps in my Savage
I have probably shot a couple of pickup loads of coyotes for the fur market and after trying a lot of different loads i settled on using the sierra 70 hpbt match bullet as the best combination of killing powder and minamizing pelt damage, exit hole was around nickle to quarter size and with a few stiches with a thread and needle you were good to go.this was in a 6mm remington so your 243 will be about the same. i tried the 90 grain speer solids but they were poor killers and if there was any cover near by that is where the coyotes would head as soon as they were hit and you had to track them down.
Love my 243 for yotes tried all kinds of loads woodchuck 58grs to deer loads always came back to 100gr win. two reasons they shoot best in my gun, have to hit them at all yardages in order to carry them home, also deer season is at same time excellent deer round the heavy 100gr. most of the time punches right thew yotes leaving small exit. Also hunting in winter there is alot of wind and heavy bullet bucks the wind better at longer distances. In my case though I am chaseing them with dogs so if hit no problem I am not the one tracking them down, have fun with that 243 Thom.
Good advice from a lot of the aforementioned folks. The Sierra Matchkings don't do a lot of pelt damage neither do the 100 grn SP. Sierra' 70gn HP is a good bullet for knock down but it blows things up and the exit could be messy. It blows chucks to pieces to the point where it ain't pretty. problem with overly light bullets is they could wound and due to balistics don't hold there down range energy as well. A lot depends at what distances your shooting at. My 1965 243 BDL likes the 70gn with 40 gns of 4350 and the SPS likes the Matchking with just about the same load charge. Don't have the specific loads in front on me but the guns do like the old IMR powder.