Equipment & Gear > Guns and Ammo

New Barnes LRX - Help Needed

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woodswalker:
first, set the OAL to place the bullet .050-.055 off the rifling if your magazine will let you go that long...then start a bit below 95% of max load, then work up .2 gr at a time.  look for accuracy, let the speed take care of itself.  if you dont see what you want...look at RE-19 and IMR/H 4350.  Same rules apply.

fastdam:
I would run a full ladder test first. If you dont get any good groups, then i would try a different primer and run another ladder test to comapere with the first primer choice. If thet doesnt work,  then i would try a different powder and run a full ladder test.  Its possible your gun doesnt care for that bullet too, but i suspect if you play with O.A.L that would make a considerable difference.
 You could find your best load so far, and start moving O.A.L. and run tests with that by increasing and decreasing seating depth by. 005 increments.  Run test increments and the groups should grow and shrink with changes made.   If you only make a handfull of different powder charges, and you dont run the ladder test, you may miss the accuracy node your looking for.
 

HoofsandWings:
From barnes site

http://www.barnesbullets.com/wp-content/uploads/2007/02/300WSMWeb.pdf

In the years that I used Barnes bullets, I found that once you figured out the oal, you back off 10 to 15 thousands.
Once you have that, getting the correct number of grains of powder is a trial or error process.
I always look at tables that show most accurate load. Pick the powder where the maximum load is not the same as the most accurate load. That will give you some wiggle room.

Rob:
Have you shot 175 grain all copper bullets out of this rifle before?

These will be longer than lead 175 grain bullets and may need a faster twist to stablize.

Rob:
Per Barnes, the recomended twist is 1:10 or faster.  1 in 9 or 1:8 would probably be best.

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