I have some Gateway 115 gr RNBB bullets that I want to load for my 9mm Shield. Doing some preliminary dummy loads it looks like from the "plunk" test, I need about an OAL of 1.07. This is shorter than the 1.1 that I have been using when loading Berry’s using 4.3 gr Win 238 for my other 9mm. How much should I drop the load back to start?