.300 Win. Mag. with R26 or RamShot LRT with 220 Hornady ELD X

[Hard Head]

Bought a Bergara HNR 26" .300 Win Mag. to do some shooting ,will use the 220 ELD X from Hornady ,only have 1 # of R26 and have 5# RamShot LRT to get some advice on ,can load to 3.560 length that is about 3/1000 of the lands and leaves about 6/1000 space in the magazine, any ideas, with powder so hard to find not sure what to do. Hardhead