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Anybody know where I can find some data for Montana Gold .429 240 gr JHP bullets and H110 powder? Can I use the data for Speer bullets from my Speer manual, starting at the lowest charge?
 

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That is what I've always done while checking for the typical signs of high pressure along the way. As a check to the common suggestions, I also compare my velocities by shooting across a chrononmeter and stop increasing the powder charge when I either reach the same velocity as with the previous components or reach maximum listed charge. I also measure the fired cases for excessive expansion, I can't recall off hand but it is only a couple of thousanths from unfired when problems can occur.
 
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