The .458 Winchester
Magnum was introduced in 1956. It is loaded to 53,000 cup and it's a fairly compact cartridge that fits in a
standard length action. The .458 Win Mag can deliver a 500 grain bullet at 2200 fps, giving it
over 5,000 foot pounds of punch. This performance has made it a favorite for hunting the largest, most
dangerous game animals in the world.
Reloading die adjustments are critical due to the thin case neck. If the crimping and
seating screw adjustments are not set exactly on the bullet cannelure, the case can easilly be crushed in loading.
It's best to crimp these cases with a separate operation. The preferred primer is usually a standard
The main problem with handloading the 458 Win Mag is case expansion
that occurs at the pressure ring "just above" the belt. Conventional resizing dies can't properly resize any
belted magnum case in this area. These cases soon develop a slight "bulge" around the case (usually
after just 2 or 3 firings). When that happens, these cases will begin to stick in your chamber or they will fail
to chamber at all. This is a very common symptom when reloading belted magnum calibers.
Handloading the 458 Win Mag with our Belted Magnum Collet Resizing Die will increase the
life of your cases and insure a perfect fit in your chamber.
"Finally a resizing die that works on belted magnum cases."
This unique collet resizing die
solves this common reloading problem and has several patented features. The top of the die serves as a case width
gauge to show when "complete" case resizing is required. This resizing die is used to eliminate the case
"bulge" after using your full length or neck sizing die. This die insures that your belted handloads will always
chamber properly. Now your cases are able to last for up to 20 firings, even when using hot loads.
This resizing die uses a collet that fits over the cartridge case, until it bottoms against the belt. The case is
then pressed into the sizing die. The collet allows your case to go farther into the
die where it only reduces the area "just above" the belt.
This ONE die and collet is universal and
works on ALL of the popular belted magnum calibers including: .257 Weatherby
Magnum, 6.5 Remington Magnum, .264 Winchester Magnum,
.270 Weatherby Magnum, 7 x 61 Sharpe & Hart, 7mm Remington
Magnum, 7mm Weatherby Magnum, 7mm STW, .300 H & H Magnum,
.300 Win Mag, .300 Weatherby Magnum, .
308 Norma Magnum, 8mm Remington Magnum, .338 Winchester Magnum,
.340 Weatherby Magnum, .350 Remington Magnum, .358 Norma
Magnum, .375 H & H Magnum, .416 Remington Magnum, .
458 Winchester magnum and several wildcat cartridges. There are no extra collets to buy when resizing
any of these calibers. This unique Belted Magnum Collet Resizing Die is made only by Innovative
Technologies. It is available from any of the authorized distributors listed on our home page.