I have the stock, plastic, magazines and use to get the rim lock problem. I got one of the @Panther magazine loaders but he has, sadly, passed.
His magazine loader easily solved the problem of rim lock. However, I have found a couple of magazine loaders.
This first one looks like the product that Panther produced.
https://jklprecision.com/product/vudoo-speed-loader/
This second one looks like might be a little better than the aforementioned loader.
https://www.battleengineering.com/product/speed-loaders/
His magazine loader easily solved the problem of rim lock. However, I have found a couple of magazine loaders.
This first one looks like the product that Panther produced.
https://jklprecision.com/product/vudoo-speed-loader/
This second one looks like might be a little better than the aforementioned loader.
https://www.battleengineering.com/product/speed-loaders/