Yes I have tried Win. and others but for some odd reason I get tighter groups with the 20 Frontier cases that were givin to me.
This is the first time I have seen a particular brand of case make a real difference and would sure like to try some more but hate to buy factory loaded ammo mainly for the cases.
RSY
I have noticed that some load recipes seem to be more tolerant of different cases than others are. Of course different brands of cases (and even different lots of the same brand) have slightly different interior dimensions, and this does effect ballistics.
However, if your powder charge is truly optimized, you'll be able to shoot to virtually the same POI with charge variations as great as .3 grains above *and* below the mean charge.
As a test, load some rounds with .3 grains above and below your normal charge weight. Then shoot twice with the normal charge weight, and two more times with the lower charge, all in one group.
Do this again, on another target, using two more normal rounds, and two more with the high charge.
Chances are, one of these groups of four shots will be closer together than the other. By deciding which group of four is the tightest, you'll know which direction to go to get into the "accuracy groove."
Believe it or not, the accuracy groove is determined primarily by the cartridge/bullet/powder combination you're using, and only secondarily by the rifle itself.
If you find, for example that the two normally charged shots are pretty close with the +.3 grain charge, you may want to move up to the +.3 charge, and try the above again. In the second test, your old normal charge will become the -.3 grain charge.
When you find a charge weight that will tolerate the total of .6 grains of powder difference without deviating much outside 1 to 1.5 MOA, you'll have your target charge, which will be the average of both ends.
After finding this "optimal charge," you will want to fine tune by adjusting OAL. There is nothing whatsoever sacred about distance to the lands. Primer considerations should come last.
You may also notice that when you have an OCW (optimal charge weight) that even primer differences don't effect you as much as you may have thought.
And certainly, to bring this ramble back to the thread's point, brass case differences won't effect your groups *as much* as they did before. Of course you can try different cases as additional fine tuning, after all of the above has been accomplished.
If you're shooting a smaller cased cartridge, such as the .223 Remington, I would use + or - .2 grain charges instead of the .3 difference.
And oh yeah... I agree, those Frontier cases are some of the best.
green 788