Throwing charges, weight variance

[Pharmseller]

I use an RCBS Uniflow dispenser to throw charges for my .223. I check weigh every 15th charge or so.

My goal is 23.5 grains but some are 23.4, some are 23.6.

So the question, how much impact does plus or minus 0.1 grain potentially have on accuracy?




P

 

[mtnbound]

I would not be concerned with a .1 of a grain.

 

[Castle Rock]

FA

 

[OXN939]

Disassembled and weighed the components of a partial box of Federal factory stuff I had a few years ago, out of curiosity. Charge weights variation averaged around .3 grains, with an outside spread of half a grain between the min and max I measured. So, for whatever it's worth, everyone getting good results with factory ammo is likely doing so despite a relatively large variance in charge weight compared to what most of us tolerate when handloading.

I always get it gnat's ass to the tenth since I'm mostly loading for hunting rifles, but a lot of loads are probably more tolerant of charge weight variations than you'd think. BLUF, one tenth not likely to affect anything.

 

[EdP]

I loaded some 280AIs yesterday. 55.5 gr IMR 4831. .3gr/55.5 x 100 = .5% How much of a difference do you think 1/2% is going to make? You can do the math for .1gr with your .223 load. I think it will be less than 1/2%.

The above is why developing a load ladder in .2 grain increments doesn't make much sense to me.

 

[waspocrew]

Definitely not enough to make a notable difference at all.

 

[Pharmseller]

I loaded some 280AIs yesterday. 55.5 gr IMR 4831. .3gr/55.5 x 100 = .5% How much of a difference do you think 1/2% is going to make? You can do the math for .1gr with your .223 load. I think it will be less than 1/2%.

The above is why developing a load ladder in .2 grain increments doesn't make much sense to me.

Thanks to all who took the time to reply.

I particularly liked this way of looking at it.

0.1/23.5 = 0.0043 (rounded up). So less than one half of one percent.





P

 

[Mojave]

50-80 FPS.

 

[MikeDeltaFoxtrot]

If your margin of error is .1 grains, you won't know the difference.