AA-2460 is my favorite for tropical loads with 480-grainers. The Western Powders data showed AA-2460 gives higher velocity with lower pressure than AA-2230 with 500-gr Hornady RNSN. That was with 74.0 grains AA-2460 at 3.305" COL, 24" barrel, F-215 primer, WIN case, 2192 fps, 52,864 psi, minimally compressed. Compare that to 72.0 grains AA-2230 at 3.305" COL, 24" barrel, F-215 primer, WIN case, 2159 fps, 53,808 psi, no compression. Over 2400 fps with 450-gr TSX at no more than 3.57" COL is a winner, using AA-2460. No need to worry about pressure in tropical climates. Lower pressure than same load in a .458 Lott with 2.8" brass:
The .458 Lott brass has to be trimmed to 2.760" to allow seating of the 450-gr TSX within the SAAMI spec COL of 3.600" using the front cannelure, which is positioned to optimize the .458 Winchester Magnum. Barnes Bullets' Mama didn't raise any fools.
When the .458 WM and .458 Lott are loaded to the same COL, the .458 Winchester Magnum wins. Either higher velocity or lower pressure, or a little bit of both. THROAT THROAT THROAT.
I will be shooting both of Sir Jerry's loads in my 24" Ruger barrel next time out with the .458 WM+. Then try them in that 23" McGowen that is a little tighter in the groove. Don't really need any more velocity than that.
Ron aka "Rip" for Riflecrank Internationale Permanente NRA Life Benefactor and Beneficiary .458 Winchester Magnum, Magnanimous in Victory THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.
