Join Date: Jun 2005
Location: Live - Cocoa, FL; Hunt - Mims, FL; Lk. Poincette, FL; Union, SC
Mine is PACT rather than RCBS, but there are similarities to consider. I put mine away immediately after its purchase almost a decade ago - and never used it again. I hope your experience with the RCBS is better than mine with the PACT.
On a Wednesday, I found that I was completely out and needed 30-30 rounds PDQ for my son's pre-hunt range site-in and firearm familiarization on Thursday. I set the PACT Dispenser up alongside an RCBS 505 beam scale and went into production with both.
I immediately found the PACT Dispenser to be considerably SLOWER in throwing a single charge - 2X slower - than what I could throw with the beam scale. This "slowness" is more than likely in the RCBS as well. Here is why.
The course powder dispenses fast as it loads the pan on the electronic scale. The signal from the scale is constantly checked by the dispenser so that it will know when to slow to trickle.
As the dispenser switches to trickling the charge, nano-seconds increase to quarter-seconds as the electronically amplified signal from the load cell in the scale "settles down" prior to sending a "stable" (average) reading to the dispenser for EVERY trickled addition of charge to the pan. Perhaps RCBS has a different set of input-to-disregard in its programming, which will speed up this process.
One seventy thousandths (1/70,000) of a pound (0.0000143 pounds), equal to 1 tenth of a grain (0.10 grain), is a very-VERY minute amount for the hobby reloader's electronic load cell to distinguish against constantly changing room air currents (you may think it's calm), temperature stratifications, house electric current fluxuations, bench vibrations, your breathing (air currents), your heart beat (vibrating the air), etc.
The load cell is constantly bombarded and measuring minute electrical changes, amplifying input, converting analog (continuous [infinite] smooth wave form) to digital (discrete [displayable] square wave form), while its programming is "thinking" about which of its nano-second inputs to disregard and which to average and send to the dispenser as the "current weight" in the pan.
This electronic amplification and "stability averaging" - is absent in a beam scale that changes immediately when trickling a charge. We LIVE in a MACRO world. Our eyes don't "see" the tiny fluxuations in the beam scale.
The load cell senses ALL OF THE TINY CHANGES in electricity, some of which have to be disregarded. The display of ALL of the load cell changes, in real time, would appear as gibberish. Thankfully in a macro-world, our rifles don't require an exact charge from shot to shot to "seem consistent" at the target, a lot of which is OUR input to variation in shot to shot, but we strive to close that gap.
Long ago, I finished loading those 50 rounds of 30-30 ammo using the dispenser and beam scale combination, but was NOT IMPRESSED with the dispenser afterward. Later, I checked the electronic scale and the beam scale. They are about 0.20 grains apart at the intermediate charge weights I load and further apart at higher weights like 338, 270, and 308 case measurements.
So I checked three (3) scales, a.) PACT electric, b.) RCBS 505, and c.) RCBS 1010, recorded each with the same set of test weights from zero to 33.0 grams (510 grains), and "eyeballed" (statistically analyzed) the results (for something to do in my retirement).
What I found:
a.) I stopped at 510 grains.
b.) The PACT and 1010 scales are capable of 1000+ grains.
c.) The PACT is lightning FAST.
d.) Swing of the pendulum in the 505 and 1010 is time consuming.
e.) The pendulum of the 1010 takes twice as long as the 505 to stabilize.
f.) From e.) the 505 is "easier to dial in" than the 1010.
g.) The 1010 won't stay on zero. Periodic readjustment (+/- 0.05 grains) is required.
Last edited by land_owner; 06-19-2020 at 08:25 AM.