I really like the 257Wthrby and have 2 of them. My UL I shoot the 115 Balistic tip with a full house of H-1000 and it shoots 1/2MOA at 200 or better. The other a Lazermark I shoot the 100 Barnes. I have taken a very large Caribou bull at 337 yards (pic is in 2007 Wthrby catalog pg 9). That 115 Bal-tip broke the right shoulder, the spine and the left shoulder. He dropped in his tracks. I did have bullet failure by some peoples thoughts as I only recoverd the jacket against the outerside of the hide on the left shoulder. The Barnes just gels everything inside as does the Bal-tip if you take lungs only. I never had to track an animal shot with this cartridge. Shot placement is where its at so pratice is very import as you will read here on this site. A 100 yards is nothing. Go to 2-300 and pratice here, the 100 is then a no brainer and technique is most important for distance then move out to 600 and the .257 will do this well. There are 'better' longrange cartridges.
Now let's talk Weatherby. They are made to be one shot rifles, the first shot period. You cannot sit and punch bullets downrange unless you have a stovepipe barrel (very heavy wall) so your talking custom now. Alot of longrange deer/elk have and still are taken with the .300 Weatherby cartridge.
With a factory Wthrby rifle you have to, have to wait (should any factory rifle) go cold that means cold steel not oh it's cooled down now. I mean cold steel cold. So don't go to the range to shoot alot unless you have all day. It is the 1st shot that counts with any rifle.
The velocity is really what makes the .257 weatherby Magnum shine. It is one bad-ass cartridge for deer/antelope hunting
. I salk to 400 if I can and shoot from there. No need to blow a stalk. I have shot deer at 50 yards too here in Pa. woods heading to the longrange fields. This is not longrange by this 'boards' standards. But works for me. I love my .257 Wthrby's. bullets are obviously an important consideration of what your hunting and the distance. I have not tried the Burgers. the jacket seems to be right on for my distances/velocity for my hunting requirements.
I use a .300 custom magnum for elk 'cause they are just really big critters period. I saw one take 4 rounds of Federal Premium 7mag 160TBBC's before it went down and that was at 225yards. The .300 just seems to put the smack on elk. This will probably bring some responses. Yup I know of guys killin' elk with .270's too but not longrange.
If you get one, no more than 3 shot groups and cold steel cold before the next group. You''ll love it. Factory ammo ain't too bad either if you can afford it. my2c.