I have a Brno 602 (predecessor of the CZ 550) which is now in 458 Lott . It always had feeding issues. I was almost resigned to it being suitable only for RN solids or ultra pointy designs. I did notice that the problem was always on feeding from the RH side of the mag, the cartridge pointed directly at the LH edge of the chamber, where it subsequently jammed. Fortunately I have two other 602's, a 300 WM and a 375 H&H. In one of those rare moments of clarity I decided to test if it was a follower problem creating the wrong geometry for feeding. I removed the followers from each of the rifles, (first marking them as to which rifle they came from). I noticed the 300 & 375 followers looked identical whereas the follower in the 458 was very different. Swapping them around, I found that the 458 cartridges now point directly down the centre of the chamber. Runs like a sewing machine irrespective of projectile shape (including very flat point 45-70 type projectiles).
Back in the day, Mauser took great care to ensure that their followers matched the cartridge for which the individual rifle was built. I doubt that many manufacturers today take that level of care, generic fit at best.
This may or may not be relevent to your rifle, but may be worth trying if you have the chance. The good thing is that no metal needs to be removed. Failing that, don't muck around, just send it to a specialist DG rifle smith such as Matrix. When talking dangerous game, gunsmith costs are way cheaper than medical/hospital costs.
