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Distinguish between cutting back on slow powder and light loads of fast powders.
It is certainly true that taking a maximum load of say IMR 7828 and a 160 grain bullet and cutting back on the IMR 7828 to a small fraction of the original load is a bad idea.
On the other hand there a many tested and proven loads to approximate say 7X57 or 7mm'08 loads in the larger case all the way down to the loads in Cast Bullet handbooks that use relatively small loads of pistol powders to achieve pistol ballistics with cast bullets in the 7mm Rem Mag case.
Although it is a bad idea to just reduce the amount of powder below proper starting loads there is no problem (save maybe the possibility of double or even triple loads if not careful) using small amounts of the proper powder.
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