Great response write up ..now just one question and what I was asking ...
If the 257/264 kills .
What and how does the 30-06 / 308 cal do it Better ? why want one with more recoil and blast
how does it kill better ?
Dead is dead ... right
The same placement with both
Not disagreeing , just looking for the reasoning.. very few wanna try and answer that
Why a 30-06 over a 257
Browning 525 provides some great insight.
Myself, I have taken elk with the following:
20 w/10 different cartridges; (20% with non magnums)
270 Wby
7mm Rem Mag
6.5x55
35 Whelen
338 Win Mag (2)
7MM STW (5)
358 Win (3)
300 WSM (3)
376 Steyr
Crossbow
280 Rem
And my shot distances have ranged from 5 yards to 475 yards, and that longer distance was an under estimation of distance! (And the only two beyond 260 yards, and most less than 200 yards - bulls and cows, quiet to full on rutting and bugling)
And to answer the questions asked:
The larger diameter bullets of the 30 cal provide greater frontal area and heavier bullets with more mass and momentum that impart greater impa t energy on elk that must be experienced first hand to appreciate (something that paper numbers just do not illustrate as effectively).
Bullets of quality construction and high sectional density (regardless of diameter) definitely penetrate better than others, as recommended by African PH's and other guides that have more experience than the average hunter, by witnessing what work in the field on a wide variety of game, taken with a wide variety of calibers, cartridges and bullets, under a wide variety of circumstances (range, species, animal behaviour and states of awareness/alertness/activity/adrenaline, shot presentation and placement, etc.) Many have minimums and/or recommendations for a reason; they know what works and what causes issues they would prefer to mitigate or eliminate. Then there is the requirement to have enough velocity to reliably drive that bullet into the vitals, provide sufficient expansion to cause the appropriate amount of tissue damage, hemorraghing, and/or shock to provide quick, clean kills. And if heavy, dense bone is encountered enroute to those vitals, the bullet must have enough energy to penetrate that bone and still make it into the vitals for that same performance. On animals like elk, which have the densest bone of any animal in North America, this means more energy, bullet mass and sectional density. A study conducted years ago found that the minimum bullet that could reliably penetrate the heaviest part of the elk shoulder boone and make it into the vitals with enough energy and expansion to provide that quick, clean kill was the 250gr bullet fired from a 338 Win Mag. And elk have a tenacity of life that I have not witnessed in any other big game taken in 37 years of hunting big game.
Then there are bigger, heavy, slow moving bullets from calibers and cartridges that have plenty of mass and momentum to reliably break big bone, and penetrate deeply with sufficient expansion to provide enough shock and tissue damage to reliably kill elk beyond what the paper ballistics would suggest, such as the 356/358 Winchesters, 348 Winchester, 444 Marlin, 45-70, etc. Big holes provide lots of blood letting!
Can you kill elk, with smaller calibers, in cartridges with less velocity and retained energy at the animal? Yes
Can you do it reliably under every circumstance, every time? No
Yes, dead is dead...Yes. And again, No. Did the animal die cleanly and quickly? Did it linger in its death throes? And require extra finishing shots? Was it a long, tedious tracking job, where the animal suffered needlessly for hours, or days?
And yes there are hunters that have killed numerous elk with 243 Winchesters, but this is the exception, performed by very experienced hunters, with exceptional rifle skills and patience and wisdom. The question for those that do not fall into this category is;
Are you willing to pass up every shot opportunity that is less than ideal in order to be able to say that killed your elk with a lightweight, small caliber bullet?
And are you 100% confident that you can place that bullet into the vitals every single time without encountering that heavy shoulder bone?
If not, use enough gun! The 308/30-06 with good quality bullets is a better choice for many hunters. For me, I like even more diameter and bullet weight than the 257/264. And more velocity than most provide. (Yes, I took a grazing, unalarmed cow elk at 370 yards with the 6.5x55...an unexpected opportunity that took more shots than I would have liked and I learned first hand the it wasn't enough, for this species at that range and shot presentation.)
Elk are majestic animals and deserve our respect and consideration in ensuring that we choose the right tool for the job.