Finally got the Glock Model 20 I've wanted for a long time. 500 rounds new Starline brass. Nosler 135's, Hornady 155's and Sierra 165's. I have a Lee mold to cast 145 gr. truncated cones from when I used to shoot .40 S&W. Would like to find a load to use the 145's in the new 10mm.

Would like a low-pressure load, so my brass won't bulge and can be reused many times. These would be used for famiiarization and practice only.I have Blue Dot, Green Dot, Red Dot, Herco, Unique and AA#5 on the shelf.

Any suggestions with any of these powders, or should I make a trip to my LGS and HOPE to find some W231 or ????? or ????

You should be fine with those. I use unique and blue dot in mine. I even did some light loads which were mid level 40 loads and it pops them out just fine. I have shot swaged and hard cast through it without any problem