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Hi n4rod, welcome and congrats on a fine rifle. I have not used a 595 but your cartridge /rifle combination should get you under an inch at 100 yds. Take it apart clean everything (adjust trigger if you wish) and torque the action screws to 30-35 in-lbs to start and try again. I am not aware of reasonably priced after market magazines and as you know the factory ones are pretty dear!
Good luck and good shooting.
-Eric
