Thread: clarification 7mmRm + ar2217 + hornady eldx 150g

The method of shooting a group with each powder charge and checking for groups is good. Just don't start that high because it will probably be time & effort wasted.

After determining the max powder charge that can be run before pressure signs, I would then drop back a few grains under that limit and begin loading multiples to test for grouping.
eg lets say we determined that the max powder charge in the particular rifle is 70gr. I would then load 5 rounds of each from 66 up to 70gr. 66, 66.5, 67, etc etc.

Lets just say that the 68gr was the most accurate out of those. Id then make up more variations around that mark but with smaller changes in powder charge. eg 67.8gr, 68gr, 68.2gr.
I would then pick the most accurate out of those, and if I was still not satisfied with grouping then I would make minor changes to the seating depth of the best shooting load.

If I was still not satisfied, Id change projectile. That is (one of) the processes to working up a very accurate load.

Originally Posted by ChrisW

The method of shooting a group with each powder charge and checking for groups is good. Just don't start that high because it will probably be time & effort wasted.

After determining the max powder charge that can be run before pressure signs, I would then drop back a few grains under that limit and begin loading multiples to test for grouping.
eg lets say we determined that the max powder charge in the particular rifle is 70gr. I would then load 5 rounds of each from 66 up to 70gr. 66, 66.5, 67, etc etc.

Lets just say that the 68gr was the most accurate out of those. Id then make up more variations around that mark but with smaller changes in powder charge. eg 67.8gr, 68gr, 68.2gr.
I would then pick the most accurate out of those, and if I was still not satisfied with grouping then I would make minor changes to the seating depth of the best shooting load.

If I was still not satisfied, Id change projectile. That is (one of) the processes to working up a very accurate load.

absolutly perfect! thanks chris.

I have a "range" i can test locally, but not in a controlled enviroment with seating etc. So the initial pressure test will be fine to do there.

once i have pulled the projectiles off those rounds, Can I reuse the projectiles? or are they now buggered? Also - I have had to order a new collet for the eldx range as a few of the 300wm rounds had a crease put around the ogive of the projectiles upon seating, again.. wil these be stuffed once they have this crease ?