I met my match with RETUMBO tonight. Hours of fiddling with it, and nothing but blood, sweat, toil, and tears. But I achieved my goal. I would not consider it a realistic goal, honestly, because RETUMBO is just a difficult powder to dispense. Consider it an upper limit to what you can to. I did manage to dispense 40 charges of 92.5 grains in under 10 seconds with a 10% error rate. That was the goal. I'm not sure honestly I could duplicate it over the long run. Observations:
First, don't try to push the limits like this unless you're in a climate controlled environment with a stable temperature. As the temperature changes, so does the vibratory motor speed and you will drive yourself mad.
Next, you HAVE TO watch the small tube when you make changes if you have lofty goals.
With RETUMBO (and probably lots of large stick powders) small tube loading is a key factor for consistency. For RETUMBO, you only want the FINE MOTOR to engage for one run. If it does a second run, the tube will be variably loaded and wreak chaos on consistency. Also, I set the fine motor speeds in a narrow range which was also to force it to do the same thing each load to make tube loading consistent for the pulse instrument. If the tube was variably loaded for the pulse phase, overages went through the roof.
That's about all the guidance I can give other than my final settings which are in the pics below. I had to change basically every setting. The "stable" times are longer than they are for my other powders, is the only other general guidance I can provide.
Good luck. Honestly, 12-14 seconds with >90% success rate is more realistic for this powder which nearly drove me mad.
Do note that while I was "fiddling" with the machine, I could have loaded about 400 338 Lapua rounds - I only loaded 100, but on the up side, even if you screw around and have a 25% error rate while you're "tuning" (I did), you're at least loading shells with the 75% that were *spot on*, and, if you're like me, you had a lot of fun in the process.
#retumbo #supertrickler