Home Forums Hunting & Shooting Express Rifles and Big Bores Only The great 458 Winchester. Everyone should own one at least once

That was the ammo tested above, and some shootin' results below.
Ms. Piggy was never zeroed with this Leupold 1.5-4x20mm until bore sighted at the 50-yard target.
Her first three shots with .458 WM+ ammo:



I was aiming at the big central bullseye and got really close to the lower left little diamond.
Scope was adjusted to zero with true clicks on the Leupold.
Five shots with the .458 WW (2.8" brass) were fired then at 50-yard target, central bullseye,
and windage was true, elevation of POI was about 2-1/2" high,
attributable to greater muzzle rise from greater recoil (4 grains more powder) and only minimally faster MV:



Here is a XERO summary of that .458 WW target above:





Paint-typed tabulation of all six loads fired, two handloads and four factory loads:



The 500-gr DGX .458 WM load only lost 40 fps from being fired in the longer .458 WW chamber, and had a std dev of only 2.4 fps for 5 shots.
The 500-gr DGS .458 WM load similarly lost 51 fps with 3.1 fps std dev.
That is excellent factory ammo velocity consistency.
In a SAAMI .458 Lott the tighter throat would make for less velocity loss/higher pressure.

Ms. Piggy is good, bad and ugly, even with lipstick.