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SKU: 458 Win Mag DG 450 TSX/20

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450 gr. Barnes TSX @ 2,200 fps / 4,835 ft-lbs
20-Round Box


ITEM 458 Win Mag DG 450 TSX

In my mind, true Dangerous Game cartridges need to be of large bullet diameter. I’ve killed a lot of game animals with many cartridges and I can say for a certainty, that if all else is equal, bullet diameter makes a huge difference in lethality.

458 diameter bullets, if constructed properly, are serious killers. In fact, you really do not need expanding bullets in 458. The bullet diameter alone, even with solids, simply kills assuming sufficient penetration.

This 450 gr. TSX load is the answer if you want an expanding bullet that will penetrate deeply enough for taking Cape Buffalo. Remember that this all copper 450 gr. bullet is longer than a typical premium lead-based cup and core bullets of 500 grs. This also means this cartridge with its somewhat limited powder capacity, the seated bullet length limits powder capacity even more and thus velocity, slightly. That trade-off is worth it as the way TSX bullets perform terminally, cannot be bested by any expanding bullet I know of. Normally, I can get shorter lead-based bullets of 450 grs. to achieve around 2,200 fps in the 458 Winchester Magnum. This load generates 2,140 fps in my 18-inch barreled 458. I could have added a couple more grains of powder and compressed the crap out of it with the seated bullet to achieve 2,200 fps, but I do not care for the practice of heavily compressing powder charges with the bullet. This load is slightly compressed, but not heavily compressed.

My 18-inch rifle shoots this bullet slightly faster than my 22-inch rifle. Why? Please read this article Velocity Versus Barrel Length”. My 18-inch rifle sports an old highly custom Marquart barrel as I had this rifle made over 30 years ago, for kicking around in Coastal Alaska. My 22-inch rifle is a factory Winchester and simply does not have as slick/fast a barrel.

458 Rifles

➤ 2,105 fps -- Winchester, 22-inch
➤ 2,141 fps -- Custom made, 18-inch

Also, I am not a fan of the under-stabilization of 500 gr. bullets in the 458 Win. Mag. When shooting 500 gr. solids, the bullet will often fail to track straight in medium (read flesh and bone) because the 1-14 twist does not stabilize a bullet that heavy/long, well enough for it to maintain stabilization while busting through medium. Therefore the heaviest bullet we will feature in the 458 Win. Mag., is 450 grs., which is the way the cartridge should have been designed originally as 450 grs. of properly designed bullet, gets the job done with any dangerous African animal and the solids will penetrate/track very straight if they feature a flat nose. A straight tracking 450 gr. solid, will far out-penetrate a 500 gr. solid that gets sideways inside the animal. Original bullets weighing 500 grs. were conceived as more of a marketing practice (WOW! 500 GRS! YIPEE) to the “heavier is better” crowd, than a practical terminal function and in the last couple decades, folks who hunt with the 458 Win. Mag. have learned that 450 gr. bullets penetrate more deeply, AS A GENERAL RULE, if all else is equal.

Shooters often say stupid things and I’ve heard several of them say that 2,100 fps with a 450 gr. bullet is just a glorified +P 45-70. Um, no! When I load this 450 gr. bullet in a 45-70 case, to max +P velocities, I barely get 1750 fps……..which by the way, I would use in Africa on Cape Buffalo without hesitation, but I’d prefer 2,100fps if I had the option.

Our propellant selection has allowed us to keep pressures below SAAMI average max. This can become important if your barrel gets filled with rainwater or dust, etc., which raises pressures upon firing and you may find that pulling the trigger with rain in your barrel will raise pressures beyond the rifle design and reliable rifle function can be compromised……..not good when facing an animal that can stomp you into a pile of bloody flesh.

If you insist on using 500 gr. bullets in the 458, the 458 Lott will be the answer for you and we are making that ammo as well, with one 500 gr. TSX option. The Lott generates greater stability to the long/heavy 500 gr. bullet due to its higher velocity. (faster rotation of the bullet) Still, if I hunt Africa with the Lott, (and I’ll be doing that in 2022) I’ll be using 450 gr. bullets for my expanding loads and for my solids.

We are also making a 400 gr. TSX load for the mighty 458 Win. Mag. and Lott, for those that like the 458 for killing giant bears, elk, moose, etc.  Although, this 450 gr. version will work well on those critters too. The first six times I hunted AK Brown Bear, my guide used a 458 Win. Mag. with 350 gr. hand loaded Hornady bullets and swore by it over the 375 H&H hands down and he had killed many dozens of big bears in his life.

This is serious ammo for serious applications. Use it with confidence. Thank you.


 ITEM 458 Win Mag DG 450 TSX - Exterior Ballistics Charts for several Muzzle Velocities


Muzzle Velocity @ 2500 fps for ITEM 458 Win Mag DG 450 TSX


Muzzle Velocity @ 2400 fps for ITEM 458 Win Mag DG 450 TSX



Muzzle Velocity @ 2300 fps for ITEM 458 Win Mag DG 450 TSX



Muzzle Velocity @ 2200 fps for ITEM 458 Win Mag DG 450 TSX



Muzzle Velocity @ 2100 fps for ITEM 458 Win Mag DG 450 TSX



Muzzle Velocity @ 2000 fps for ITEM 458 Win Mag DG 450 TSX



Muzzle Velocity @ 1900 fps for ITEM 458 Win Mag DG 450 TSX


Muzzle Velocity @ 1800 fps for ITEM 458 Win Mag DG 450 TSX


Field Proven rifle and gun ammo. Maximum firepower ammo. Best ammunition for rifles and guns for sale. Buffalo Bore. Strictly big bore. Strictly Business.

You must be 18 or older to order ammunition. Ammunition must ship UPS ground. Due to Department of Transportation regulations, we cannot accept returns on Ammunition. Make sure to use the correct ammunition in your gun. Check local laws before ordering.

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