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Hi John and welcome. This is a specifically chambered .38 Special SP101. The 357 Magnum is available here: https://www.budsgunshop.com/product_info.php/products_id/70242/ruger+sp101+357+magnum+revolver - Cheers, stay safe and enjoy!

They do make the sp101 in .357(which can also shoot .38)... however they do also make dedicated .38 versions (which cannot shoot .357).
The model in question is a dedicated .38 version