a bit of bullseye over the primer, then a layer of Unique, then some 2400. This has to be a compressed charge, held immobile by the bullet's pressure. If the powders are allowed to mix, sooner or later, you'll get a detonation instead of combustion and blow up your gun.
I've thought about using a layer of .22lr powder under the main charge of Alliant Bullseye powder, to get 70 gr Split Noses to 2400 fps in the Commander, using .45 Super brass and not bother with the .460 brass and re-chambering.
In order to attain this velocity safely, the rifling would have to be converted to "Paradox" style. The rear 1.7" of the rifling in the commander's 4.2" long barrel would be reamed out, leaving that portion of the barrel "smoothbore" and still leaving you with 2.5" of rifling near the muzzle. The hollowbase "skirt' of the bullet will "upset' enough to seal the powder gases behind it and the lack of initial resistance to the bullet's travel will lower the chamber pressures ( a LOT). This trick will (safely) let you load more powder under the bullet. Roy Weatherby used this trick of "free-boring" to gain 100 fps or more with his magnum rifle cartridge designs. He also used 26" barrels, gaining about 100 fps over the (testing standard)24" barrels.
The Nazi's used constricted bores in their AA belt-feds, so as to raise muzzle velocity of the projectiles.(a helluva lot)
This load would probably have horrendous flash, unless you mixed a bit of FFFG black powder in with the Bullseye. It would doubtless have horrific blast. 900 ft lbs, tho, in a CCW pistol, Could also be an 80 gr, hollowbased swc, at 2200 fps, 870 ft lbs, for use on big critters. Sort of beats the crap out of the 5.7 FN, powerwise, eh?
Such solid copper bullets (swc AND the split nose segmented bullet) pierce both sides of a GI steel helmet, at pistol combat type ranges. They pierce Kevlar vests, too. Colonel wesson took grizzly and elk with an 850 ft lb load in an 8" 357.
I first read about the hollowbasing trick in a 1966 (IIRC) guns and ammo mag article. The French THV/Arcane ammo-makers used it to (safely) get 45 gr 9mm's to 2400 fps in 5" barrels.
The 2.5" of rifling would give you plenty of handgun combat type accuracy, but i"m not sure that it would suffice for hunting type accuracy. Ross Siefried used this idea in a 7.5" barreled .45 Colt Ruger, with the goal of using shot cartridges (mostly). He said he got 2.5" groups at 25 yds, using heavy for caliber cast swc bullets.
Louis Seman, old time smith and the guy who got the ISP to go with the 9mm M39 S&W in 1970, converted either a M39 or 9mm 1911 (I forget which) to .30 luger. IIRC correctly, I think that he made a barrel liner for the 9mm bore. This was in the .70's, guys. Some gunmen are generations ahead of the normal run of gunowners, as to their thinking and attainments.
I've thought about using a layer of .22lr powder under the main charge of Alliant Bullseye powder, to get 70 gr Split Noses to 2400 fps in the Commander, using .45 Super brass and not bother with the .460 brass and re-chambering.
In order to attain this velocity safely, the rifling would have to be converted to "Paradox" style. The rear 1.7" of the rifling in the commander's 4.2" long barrel would be reamed out, leaving that portion of the barrel "smoothbore" and still leaving you with 2.5" of rifling near the muzzle. The hollowbase "skirt' of the bullet will "upset' enough to seal the powder gases behind it and the lack of initial resistance to the bullet's travel will lower the chamber pressures ( a LOT). This trick will (safely) let you load more powder under the bullet. Roy Weatherby used this trick of "free-boring" to gain 100 fps or more with his magnum rifle cartridge designs. He also used 26" barrels, gaining about 100 fps over the (testing standard)24" barrels.
The Nazi's used constricted bores in their AA belt-feds, so as to raise muzzle velocity of the projectiles.(a helluva lot)
This load would probably have horrendous flash, unless you mixed a bit of FFFG black powder in with the Bullseye. It would doubtless have horrific blast. 900 ft lbs, tho, in a CCW pistol, Could also be an 80 gr, hollowbased swc, at 2200 fps, 870 ft lbs, for use on big critters. Sort of beats the crap out of the 5.7 FN, powerwise, eh?
Such solid copper bullets (swc AND the split nose segmented bullet) pierce both sides of a GI steel helmet, at pistol combat type ranges. They pierce Kevlar vests, too. Colonel wesson took grizzly and elk with an 850 ft lb load in an 8" 357.I first read about the hollowbasing trick in a 1966 (IIRC) guns and ammo mag article. The French THV/Arcane ammo-makers used it to (safely) get 45 gr 9mm's to 2400 fps in 5" barrels.
The 2.5" of rifling would give you plenty of handgun combat type accuracy, but i"m not sure that it would suffice for hunting type accuracy. Ross Siefried used this idea in a 7.5" barreled .45 Colt Ruger, with the goal of using shot cartridges (mostly). He said he got 2.5" groups at 25 yds, using heavy for caliber cast swc bullets.
Louis Seman, old time smith and the guy who got the ISP to go with the 9mm M39 S&W in 1970, converted either a M39 or 9mm 1911 (I forget which) to .30 luger. IIRC correctly, I think that he made a barrel liner for the 9mm bore. This was in the .70's, guys. Some gunmen are generations ahead of the normal run of gunowners, as to their thinking and attainments.
