For plains game, I would think a 30-378 WBY caliber with a high quality LPVO 1-6 or 1-8 (Swarovski, Leupold, Trijicon) would do the trick on any plains game under 400 yards. The 30-378 WBY is flat shooting out to 1,000+ yards and could be the ultimate plains game cartridge?
You've already taken some guff for this claim, which was likely misspoken.
As we all know, the only thing "
flat shooting out to 1,000+ yards" is a laser beam.
And during that beam's 3 microseconds of travel it is pulled downward by gravity ~0.0000000018".
I.e., nothing is truly "flat shooting" on Earth, not even light.
But, I take your point about the relatively flat shooting .30-.378 Wby. Nevertheless, its impact velocities on PG would be a meat-wasting to 200yds, and at 300yds what the .30-06 is at MV.
With your 300yds PG limit, a .30-06 zeroed for 200yds is usually sufficient on light PG out to 300.
I just think that plains game should be under 300 yards, and DG should be within 50 yards.
Very sensible, and it demands consistent stalking skills.
Getting closer has a myriad of cascading benefits.
Think of it this way: if the distance is far enough to need the sticks...are you actually so far away to cheat yourself out of a thrilling stalk?
[300yd PG limit and 50yd DG limit] is a good way to not make the most of a trip.
Wounding animals from unsporting (or incompetent) distances is a good way of
ruining a trip.
Getting closer reduces in every way the risk of wounding.
btw, you mentioned only your leg-shot oryx,
but neglected your gut-shot zebra:
I feel very steady and take the shot. I hear the report and solid smack. A hit! I reloaded the single shot and get ready, that’s when Santos says “I think it was a gut shot…”
4 zebra all run up out of the ravine some 400 yards away but we don’t shoot, they are all healthy. As they go over to the other side and out of sight we see one more… it’s our stallion. Slowly climbing and blood on his mid side. He was going for the top. I shoot quickly as he’s cresting. Santos says he thinks he heard the hit and maybe saw the zebra drop?
The grass is tall and we still can’t find any blood. We now know that the first shot was very far back...
My second shot was pure luck and hit the back of the neck as he ran away.
_________
For me, one animal was recovered after tracking and finished off
During my 2nd safari (1st in RSA) at the end of a long day a very nice 52½" Kudu showed himself, standing still quartering away. We hadn't sticks at the moment. I made a 100yd offhand shot when tired that I suspected to be insufficiently steady, and thus made everybody pay for my mistake with a long follow-up. In thanks (and in penance) for the crew's effort, I took the entire camp out to a nice dinner. Moral: it is
so much easier to shoot well than clean up after a sloppy shot you shouldn't have taken. Since then, I haven't pressed trigger on anything with <90% confidence. (I also got over my
kudu vudu by dry-firing at them at any opportunity. It worked.)
For me, one animal was wounded and never found
I wounded a very large (100kg/220lb) bushpig because I misjudged his size through the tall grass at 25yds. Although the 300gr TSX from my Marlin .45-70 perfectly did its job (creating a "no-man's land" exit wound), missing entirely what I thought was the boiler room. He ran off like a locomotive, and we tracked him in dense riverbed for hours. By afternoon, his wound had congealed and we lost blood spoor. Quite the bummer! (My PH remarked that it may well have survived, not that I didn't have to pay the full trophy fee.)
I've taken 52 animals in Africa, and lost that one. I try hard to make it the last one, ever.
Some hunters can be pretty flippant about wounding, and a lack of remorse/shame pisses me off.
(My verbal response varies, depending on if I'm a client

or an assistant PH

.)
Most PHs gloss over casual wounding in public, but bitterly complain about it behind closed doors.
If bad shooting is chronic, then a stern conversation will at last occur!
Jeff Cooper had a tidy bit of advice on field shooting:
Get as
close as you can, and then as
steady as you can.
When you are as close and as steady as you can, take the shot only with at least 90% confidence.
Otherwise, pass on it. There will be other opportunities.
Good hunting!