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What is the twist rate of your barrel? I thought the Savage had a fairly slow 1 in 12 twist rate.
To shoot out to 500-600 yards you will need to be shooting a much heavier bullet - at least a 69 grainer(minimal really), 75 grainer from Hornady or the 77 or 80 grainers from Sierra, for example. The 80 grainers have to be loaded long and are shot single shot in an AR15. They may present a problem with your chamber.
To stabilize the heavier bullets a 1 in 9 twist barrel can reliably handle up to 69 grainers. One of my 1 in 9s can handle the Hornady 75 grainers and the other puts them all over the target at 200 yards.
For the heavier bullets a 1 in 8 or 1 in 7 twist is really needed for the .223.
For my 200 yard loads I use Accurate Arms 2200 Data Powder. Pretty cheap from Natchez Shooting Supplies. I have good luck with 69 grain or less bullets with it.
I shoot Sierra bullets almost exclusively and buy them in a minimum of 500 round bulk packs.
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