That sounds right to me. If you are going to a heavier bullet then you would back off the powder charge.
The heavier the bullet the less powder charge you use.
Pulled these off of http://stevespages.com/451p_1.html
200 grain .45 ACP - AA-7 From 9.5 grains to 11.2 grains
230 grain .45 ACP - AA-7 From 8.6 grains to 10.7 grains
I have a light bullet (e.g. 125 grain) and the only load data I can locate is for a heavier bullet (e.g. 158 grain). I need a safe starting point to develop a load for this lighter bullet.
A.
The physics of loading cartridges indicates that a heavier bullet will build pressures faster than a lighter bullet owing to its mass. The greater mass of the heavier bullet resists change (acceleration) more than a lighter mass so the powder charges for the heavier bullet will nearly always be lower than those for the lighter bullet of the same construction. This indicates that, without other data to follow, the heavier bullet data can be used as a starting point for the lighter bullet.
The rule of thumb is always: when using a heavier bullet, use less powder for the same pressures. Heavier bullets makes the powder burn faster, as do jacketed bullets versus lead bullets. Faster burning creates greater pressures (and of course velocities).
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