I have the same gun same cal, all I can do is shoot a few ideas at you I have no fliers out to 600 i shoot 3.5 and have shot 2.4 inch to 600 in 5 shot groups or more first do you have a top quality scope, I have tested 3 scopes T 36 Weaver, Burris 8x32x50 black diamond and Leupold Competition 45x and the Leupold holds the best, next is I also found a neck bushing die helps also. Good luck, 1.5 at 500 is great good shooting.
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