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That's where the business of "working up" comes in. Put in more powder for the 165s.
I must say, reducing a -10% "starting load" by another 10% or even 5% is news to me, but I have only been doing this stuff since about 1970 with Lyman and Speer books at hand. (Some calibers in Lyman have very light starting loads apparently chosen for 7000 psi, not any particular reduction in powder charge.)
You may be satisified with reliable function, I started out that way. Then I got a chronograph and now I adjust my loads for velocity. I have loaded
Factory equivalent.
USPSA Major power factor*.
USPSA Minor power factor*.
Least that will function the gun without getting too erratic.
*Power factor = bullet weight in grains X muzzle velocity in fps. Truncate to three most significant digits. 124999 -> 124 not rounded up to 125.
Minor is at least 125, Major is at least 165.
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