What if all the powder hasn't burned

[DougMH]

OK, you've got your MXX-123 scale measureing to +/-.02 grains (1 granule of Varget). You're powder is definitely measured more precisely than the guy with a RCBS Chargemaster at +/- .1 grain.

My question is. If every grain of that powder is not fully burned by the time the bullet leaves the muzzle, does all that accuracy of powder measure really make any difference beyond your confidence level?

No speculative answers please. If you know for a fact one way or the other and can provide an article or other proof, I want to hear it.

Has anyone conducted exhaustive tests using a +/- .1 grain measure against a +/- .02 grain measure that shows tighter elevation groups for the latter.

Just trying to figure out how I want to spend my money. I already have a Hornady AutoCharge +/- .1 grain.

 

[DougMH]

Today I dispense with a Chargemaster and adjust on the VIC-123, every charge for every rifle be it one of the match guns or the 19 Calhoon groundhog plinker. Takes about an extra 10 seconds over the Chargemaster alone once you get the hang of it.

Precisely how I do it. I add .6 seconds to the Hornady Auto Charge and set it .2 grains below my desired weight (42.8 when I desire 43). Sometimes, especially with extruded powders like Varget, it goes over to exactly what I desire... meaning it beeps over if it hits 43. Most of the time it's the .2 or more often .1 under weight. I dump from the Auto Charge to the D.I. I trickle with extra Varget from a little open-ended box and flick out single granules using a pencil until it's exactly what I want on the D.I. It's about 5 granules to the grain or .02 per granule. Works out perfect. When I'm over, I'm getting real good at scooping out onesy's and twosey's.

Thanks for the solid response.