I don't know what the Scirocco costs, but the Hornady 154 Interbond lists for $43 a hundred. Their 154 SST ( which admittedly might be a bit soft for that RUM) goes for about $30.
They don't show loading data on their website, nor did I find any notes about any special loading cautions for the Interbonds. So it should be safe to back off your Scirrocco data about 10% and substitute the Interbond (or SST) bullets. Exercise the usual caution as you work back up.
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