You not having 560 should put you into the 555, but 565 might be slow enough case fill could be 105% for a healthy velocity. 555 might not be 100% before pressure signs. At max pressure there could be 5-8% fill difference. VV doesn't list 205, but does list 208 and 565 was higher by 120fps.
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willfrye027
Well-Known Member
I see what you're doing and it's a good plan. Might as well try a few powder and bullet combos early in barrel life.
I've done similar and you can pretty easily tell what combo is going to shoot well.
I think you could also pick the 2-3 powders that historically have done well, pick a middle of the road charge, and shoot a 10 shot group. Might as well shoot it at 700 yards if that's the end goal. And once you pick your powder/bullet combo work up closer to max.
I've done similar and you can pretty easily tell what combo is going to shoot well.
I think you could also pick the 2-3 powders that historically have done well, pick a middle of the road charge, and shoot a 10 shot group. Might as well shoot it at 700 yards if that's the end goal. And once you pick your powder/bullet combo work up closer to max.
Mike Matteson
Well-Known Member
With load of 60+ grs to start with. Go up a .5gr at a time. if loads manual is under that, then increase by .2grs for each load. Only one load for each increase. Watch for pressure signs. Note your velocities for each load and see how they do in a ladder test. That way know what your max load can be. i don't know what your case prep is either. The more case prep you do the better. Top end brass will help too. Depending where you want to go with the load. The powders you have noted are bouble base powders. They react to temp change.
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