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7mm caliber conversion kit

I have a model 54 winchester 7mm that i would like to reload for. I have ordered everything but the caliber conversion kit. Looking at the list there wasn't one that looked like it was right. Which one should i order?

For which machine? A Model 54 should be 7x57mm Mauser chambering.

The RL550 B conversion kit is #20142, XL650 conversion #21093

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