A 20 Vartarg with 32 grain V max only needs 4 MOA at 400 yards and will lift a ground squirrel at that distance. My favorite varmint cartridge. Deadly on coyotes too.
Last June, "Humble Henry" Rivers, and pal Joe, accompanied me on a prairie dog shoot in East central Wyoming - it was crazy good - best dog population I had seen in 25+ years . . . it was, "like the old days" (pre-1990), North of Fort Peck Res., NC MT!

"Humble" took several .20 Cals: Prac.; .204; Vartarg - the VarTarg was a total surprise: lobbing 40 GR. BT, it was
impressive to, as "Humble" called it, "way over yonder", or, about 350+ yards. The .222 and .223s didn't stay out for long, before the 20 cals. re-emerged - especially, "in the wind", the .22s were comparatively lacking. My 20BR, .204, and Joe's .204 rubbed salt in the wounds of most .224s. Initially a .20 Cal. skeptic, Henry, drove home convinced . . .
The only .22s to hold up well were my .220Swift, Ack, Imp. (52 Gr. at 4150 FPS - RL-17), and Joe's .22/250 shooting 40 Gr. V-max, at a whopping 4020 FPS (yep, I had to "eat crow", as I called BS, then attached the MagnetoSpeed for a few shots). Joe was shooting the [maximum] Hogdon DATA for CFE223 from the Hogdon web-page. As I recall, the MS chronograph recorded his MV within a few FPS of the Hogdon DATA.

At that velocity, despite the lousy BC, I had to tip my hat, as , out to 400 yd., Joe was able to put a serious hurt on the p-dogs - even in a little wind.
Back to the point - the 20VarTarg exceeded any expectations - it's performance was impressive.

RG