How much H335 behind 123 gr SST?

[603 Country]

Just to bring this to a close, I settled on 27.2 gr of H335 behind the 123 gr SSTs. I had read that 27.5 gr was often the good load, and someone on this forum also used the 27.5 grains. I tried it, and even went into the low 28’s, but backed off to the 27.2 for great accuracy. Primers were looking pretty flat in the 28’s.

Thanks to you fellows for all the info. I’m very happy with the load.