No their not, I have/own/use the 503 clone myself. They wouldn't fit inside a 40s&w case (.430 503 compared to the .401 inside dia of the 40s&w case).
The bullets/cores I used are the Mihec's 359640 & the swaging die has a swc nose/tip. The cores will swage down (shrinking the hp) as they expand to fill the 40s&w case (.359 vs .401).
The 503's are on the left & the 359640's on the right. If you look at the top of the 3 bullets in the center you'll see that the cast bullets have a larger meplat & penta point.
The side view shows the size/length difference in the 3 bullets & again the nose is wider on the 503 (left) & the 359640 (right) is shorter.