Yeah, you're super limited with 243 match ammo due to the fact that the 6mm Creedmoor exists. If there was a 108 ELD-M match ammo offering or a 105 Berger Hybrid, you'd be set, but unfortunately, you're not gonna find much because the 243 is still seen as the varminiting caliber where the 6CM has become the match caliber.
As @Buji88 said, try some 90+ gr factory loads and run them. If you can start handloading then you'll open up a whole world of possibilities!