A 1:9 twist will stabilize bullet lengths equivalent to lead-core bullets of 40 to 73 grains in weight.
Remember, it's not the weight of the bullet, but the length of the bulllet that determines whether or not a 1/?? twist will stabilize it.
Plastic-Tip, VLD, and solid copper bullets are longer for any giving weight.
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Ed Harris pointed that out several years ago.
His 9 twist .223 would stabilize the 68-69 gr boattails, then the longest made, but it was still more accurate with the 52 gr benchrest type. That at 100 yards. If the range is long, wind gets to be more important than +/- .1 moa at 100.
I looked at some of Sierra's load data and compared it to Hodgdon's. Sierra has a start load for Varget of 19.9. Hodgdon has starting load of 24.0. So, again I am confused as to where to start. I read you should not start below min load. Thanks.