I used HKS speedloaders for years, and they work, but then I tried Safariland Comp IIs and they're mo betta. The HKS requires a twist of the knob to drop the cartridges but the Safariland is a just a simple push. Also, the cartridges don't wiggle around so much when you're aligning them with the charge holes.
https://www.safariland.com/products/...-ii-11231.html