not sure about the sierra's but with the 300 grain lapua scenars you can load touching the lands and still have plenty of room in the magazine.i have been hearing r-25 is very temp sensitive,so i have shyed away from it.i use 89.5 grains of retumbo with excellent results,but everybody i have talked to says i can do better with vihtavouri n560 so i ordered 2 pounds to try.
good luck the 110 ba 338 is a shooter.
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