Ballistic coefficient has nothing to do with reliability, accuracy, or repeatability (for a given projectile). Ballistic coefficient is a numerical representation of drag. It gives you an idea of how efficiently a projectile moves through the air. A lower BC does not mean a projectile is less accurate, it just means it slows down more quickly compared to a projectile of the same weight with a higher BC.
Here’s an example: I used to shoot Remington CoreLokt 130 grain out of my Tikka. Now I shoot Barnes Vortx 130 grain. They both had a published velocity of 3060 FPS at the muzzle. They both shoot MOA, but the point of impact is significantly different. Now, I did not chronograph them to compare actual muzzle velocity from my rifle, but assuming they are equal or close to it the only explanation for the difference in point of impact is the difference in BC. The rem has a BC of .336 and the Barnes has a BC of .392.
Pick a good ammo with a good bullet designed for hunting and focus on shooting your gun with your chosen ammo well and you’ll find success.