1.5-5x20mm on the .375 H&H. Rugged. Around 1,000 rounds now down the tube with no issue. I tend to have it on 5x from the bench, but leave it on ~2x in the field.

1.5-4x20mm on the 400 Jeffrey #1. Mostly as an experiment to see if it will eventually puke. So far, so good. I just leave it on 1.5x. It's more than this cartridge needs.

2.5x20mm on the 9.3x62mm. Simple, rugged, though only 275 rounds down the tube. Taking the setup with me to Africa in the next couple of months chasing Cape Buffalo. Afterwards, I plan to swap scopes between the 400 Jeffrey and this rifle as I think it will be a better fit.

It's you and the bullet, and all the rest is secondary.