Shot my Acurra 45 MRX today. Groups great. 2220 MV.
They work great with the MRX. I assume you're talking about the Powerbelt 285? The twist rate in the 45 MRX is 1/22. The specs on the bullet are stated for 26 twist rate or faster. Not sure why the tech said they "May" work. I run them with 83 grains weight of BH209, 2220 FPS, and a different breech plug so I can run the magnum rifle primers. Shooting to 300 yards with very accurate results. Here's a 200 yard target. The picture above in my prior post also shows some great results.!Looking for some real world results with the ELR 45 cal bullets. They are not designed for the twist rate of the new Accura MRX-LRX. The CVA customer support technician said they may work.
As with my paramount i can see an upgraded ignition system..