The .577 Nitro Express As A Parent Cartridge
.577 Tyrannosaur - Created by Arthur Alphin of A-Square Co. as a replacement for a bolt-action 577 Nitro Express.
.585 Nyati - Made by blowing out the 577 Nitro Express case and turning the outer edge of the rim so it is slightly rebated, making it a "rimless" cartridge.
.600/570 JDJ - Created by SSK Industries; made by necking up the 577 Nitro Express to accept .620 inch diameter bullets from the 600 Nitro Express.
.620 JDJ - Created by SSK Industries; made by shortening the 577 Nitro Express case to 2 inches and necking it up to accept .620 inch diameter bullets.
14.5 Whisper - Created by SSK Industries; made by shortening the 577 Nitro Express to 2 inches. Designed for subsonic accuracy with heavy bullets.
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