general rule of thumb - .33 to .375 is medium, and .40+ is large. everything below .33 is considered small (though I'd include .325/8mm in with medium).
i cannot see what the problem is with the 458win.
accepting that it might not give 2200 to 510 gn bullets, is this a problem?
all the great 45 cal nitros used a 480 gn bullet, so is a 500+ gn bullet necessary?
can an animal tell the difference between 1900 and 2200 fps?
put a 480 gn bullet in the 458 and you have a 450 nitro.
the old kynock bullets i have fired into wet clay all held together and mushroomed, when hornady 500 gn turned inside out and totally lost their cores.
something was lost in bullet making over the years, but now you can get good bullets again.
If the "effect" that you are talking about is that the bear would be dead then I'll agree....either bullet placed in the right spot and the bear would be dead.
The problem is that to be equal you would have to be equal in the same respects.
The 458 starts out being larger thereby creating an instantaneous advantage of an already larger permanent wound cavity. The second is that a 300 grain 458 bullet out of the winchester can reach around 3000 fps and the 350 at about 2750 and then some before bad pressure signs. With the larger diameter it will shed energy more quickly, but it will be inside the animal where it counts.
On the flip side the 375 /350 grain due to profile and diameter will penetrate deeper but both will exit a standing or side shot.
I still contend that in my opinion the the 458 Winchester Magnum is my choice ad the minimum big bore that I would use on DG no matter what continent they were on.
To big a spread between the medium bores if you consider anything smaller than a .45 a medium bore.you are correct, for muzzle loaders its basically 30-50 caliber for small bore. then you have 50-80 caliber for medium bores and 80+ caliber for large bores.
so if RSA made the .22 caliber legal for elephant then you would say the .22 is a large bore? African politics should have no bearing on the definition of the term "large bore".
i think the traditional terms are fine, whats wrong with calling the 375 and 416 caliber medium bores? calling them medium bore cartridges does not reduce their effectiveness on game. large bore smokeless cartridges start at .458 and tend to be very specialized cartridges designed for only the largest game usually at short range. medium bore cartridges run from around .350-.440 (these arent exact but im too lazy to look it up) and tend to be more of "jack of all trades" cartridges suitable for both medium and large game including dangerous game.
i use my 416 RM primarily as a PG rifle firing a 300gr bullet at 2700fps. the benefit to this is that if there is a problem with my large bore rifle on a DG hunt then the 416 can pull double duty and be used for dangerous game as well. i dont believe in "one gun safaris" and from personal experience would always recommend bringing two guns that are both capable of performing the same role.
To big a spread between the medium bores if you consider anything smaller than a .45 a medium bore.
I think that under .30 is a small, .30 to .39 is medium, .40 and up is big bore.
Of course, that is just my opinion, and is worth what you paid for it.
I agree with you.I think it depends on who you talk to...
Most would tell you that anything .375 or larger constitutes "big bore"..
Many others would tell you that "big bores" start at .40 however .. and that nothing smaller meets the requirements..
I dont think recoil or even the delivery of kinetic energy is considered by most people.... I havent met anyone that would argue that a .45-70 isnt a "big bore".. but clearly the .45-70 delivers pretty weak sauce when considered side by side with a .375 H&H, which some consider a very big "mid bore"...
I just have a hard time lumping .338 with .17I would still count the 8mm and .338 as small bore guns. Bell himself considered the 318 WR (.330) to be a small bore gun. however there aren't actually that many medium bores still in use today. all I can think of are the .358, .366, .375, .416, and .423 with those last three being fairly uncommon outside of African hunting. thanks to modern powders and modern bullets, small bore guns have just about completely taken over the hunting industry.
So in that system, what is a .416 or .404?Just to keep up with the question the Gentleman post ":
What is a "Big Bore Rifle caliber????
Pierre van der Walt , author of African Dangerous Game Calibers...
Transitional Bore Cartridges:
9.3 x 62 to the .378 Weatherby Magnum
Large Bore Cartridges :
.450/400 Nitro Express 3" (Jeffery) to the .460 Weatherby Magnum
Super Bore cartridges:
.500/465 Nitro Express(H&H) to the .600 Nitro Express...
I believe Pierre van der Walt is a specialist on his subject and has extensive knowledge in this field ...