What grain weight is the vmax bullets that you are using?

I guess you will be taking brain shots on the cull, so to what distance do you shoot too? Or do you take lungs shots as well.

Springbok are fairly small so I would guess a .22/250 to the brain does a fair amount of damage. I shoot a few fallow deer for meat each year with a .22 Magnum with brain shots and it does well enough. Until one stag this year which dropped to a front on shot. I shot another and the first had his head back up. I do prefer a side shot with a .22. They do move their heads a lot so one must wait for the perfect opportunity. A .22/250 would mush the skull pretty well.