Sorry, I was talking about standard factory rounds based off the standard magnum case I guess which going way back is probably the 375 H&H case. I even have an old 375 weatherby off the H&H case from before the 378 came out. Your right the Dakota and many wildcats off the standard magnum case will shoot with the weatherby's. But that was my point. They did a lot of wildcatting to try and get weatherby performance when they could have just got a wby. That goes back to cost of brass and just natural curiosity invention I guess. Now the Lazeroni's, Dakota's, Ultramags and several others compete but then about the same time weatherby comes out with the 338-378 and 30-378, popular wildcats for years, in factory rounds and stays on top. I was just as guilty of it as anyone. Heck, when that 8mm remington magnum came out we could't wait to neck that thing to whatever was reasonable, or unreasonable in some cases. In reality all we were doing was making a 7mm-300 wby, 300 wby, and 340 wby with a different shoulder and cheaper available brass. I know back several years ago the 257-8mm rem mag or they called it then a 257 STW got very popular and I couldn't figure that one out because the 264 to me was always the best one of those and did much better ballistically plus not as hard on barrels. But for some reason it never took off like the 257 did. I still have all of those originals necked off the 8mm rem mag starting with the 257.
Same way with the ultramag when it came out. By the time the 300's were hitting the shelves I already had that thing necked to 7mm, 8mm, 338, 358 and 375. In my opinion the 338 ended up being the best round out of all of those.
I try to remember all this stuff from way back and write it "off the top of my head" you might say and with old timers disease sometimes it don't come out exactly right.
Predictions are difficult, especially when they involve the future