Perhaps keep an eye out for a take-off barrel in 6.5 Creedmoor as it will be 1/8 twist - then get it fitted and chamber for 260 Improved 30degree to clean out the chamber. Minimal expenditure for a reasonable gain - @Mathias and @Uplandstalker can shed some light on what that might be.
As others have pointed out, the 6.5 SAUM (or PRC as good brass available?) really comes alive in a medium or long action with the 147 to 156 class projectiles. You will have to seat bullets very deep in a Model 7 and might not gain much for fairly large gunsmithing/parts bill.
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