FireInTheWire
Caprock Crusader
I've used these. They work goodLots of competitors use little two round plastic clips that mount on the side of the action.
Here is an affordable elastic version. Just the first option that my quick search brought up.
SAP Two Round Holder - Short Action Precision
Hold two rounds right where you need them in a pinch with the SAP Two Rounder! Two round holder, two shell holder, Short Action Precision, Precision Rifle, two bullet, two cartridge, 2 bullet, 2 round, 2 cartridge, two spare, 2 sparewww.shortactionprecision.com
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