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The Barnes TSX in .458 caliber is a 300 grain, 100% copper projectile that reloaders reach for when they want deep, controlled penetration on serious game. Being lead-free and solid copper means the bullet holds together on impact instead of shedding weight, and that structural integrity is exactly what makes the TSX such a trusted name on big-bore rifles. On impact the nose peels back into four cutting petals, and the bullet pushes straight through dense bone and muscle while hanging onto nearly all of its original weight. For a .458 shooter loading up for heavy game, that kind of consistency matters a lot more than raw speed.
Take a look at the shank and you'll see a set of precisely cut grooves. These rings act as relief valves as the bullet moves down the bore, which helps bring pressure down, cuts back on copper fouling, and keeps groups tight across a loading session. For a monolithic copper bullet that rides the rifling a bit differently than a traditional cup-and-core, that engineering is a big part of why the TSX earned its reputation for accuracy.
At 300 grains with a 0.458 diameter, a flat base profile, a 0.234 ballistic coefficient and a 0.204 sectional density, this bullet suits cartridges like the 45-70 Government, .458 Winchester Magnum and .458 Lott. One thing to know going in: copper monos generally shoot best with a little jump to the lands. Barnes recommends starting around .050 inches off the lands and tuning from there, and that advice has held up well for handloaders across a lot of rifles. Give yourself a little room to test seating depth and you'll usually land on a load that prints cleanly.
Since 2003 the TSX has grown into one of Barnes' most popular hunting bullets, and the .458 flat base version carries that same track record into the big-bore world. If you reload for a dangerous-game or heavy-timber rifle, this is a proven component to build around.
This 0.458 diameter bullet works in a range of big-bore cartridges that share the .458 bore, including the 45-70 Government, .458 Winchester Magnum and .458 Lott. Published load data covers a wide spread of calibers and powders for this exact 300 grain TSX flat base bullet. Always confirm your specific cartridge against a current reloading manual before working up a load.
Barnes recommends starting around .050 inches off the lands with their copper bullets, and that has proven to be a reliable starting point for a lot of handloaders. Copper monos like the TSX generally prefer more jump than a traditional lead-core bullet, so give it some room and tune seating depth from there. Keep in mind that pushing a copper bullet too close to the lands can raise pressure, so start with that recommended jump and work carefully.
Yes, the TSX is built from 100% copper with no lead core. Because it's a solid copper projectile, it holds together on impact and retains close to all of its original weight, which is a big reason it's trusted for deep penetration on heavy game.
Those are Barnes' Accu-Groove rings, and they act as relief valves as the bullet travels down the bore. They help reduce pressure, cut back on copper fouling, and support consistent accuracy. It's a key part of why the all-copper TSX shoots as well as it does.
| UPC | 716876458141 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 30615 |
| Bullet Caliber | .458 Caliber |
| Caliber/Gauge | .458 Caliber |
| Grains | 300 |
| Quantity | 20 Per Box |
| Shipping Weight | 0.95 |
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