Does (small) bullet weight variance matter with 9mm?

Paleoman

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I have some Precision Bullets 125gn for 9mm that I’m reloading. I just happened to place several bullets on my digital powder scale and I seem them ranging from 125.2 to 125.6 gn.

Will that effect the performance?

Is that kind of variance expected?

I never have checked with any other bullets, before. Just was curious.
 
I doubt that you'll notice a difference but if you just have to know, load 10 rounds that weigh exactly the same and load 10 rounds with the maximum variation. Shoot both groups.
 
Buy some CAST bullets and you'll see the variation would be from 122.5 or so up to 128.8gn or so--and they would ALL shoot to the same point up to 50 yards.
You are not likely to be shooting out past 600 yards where weight variations "might" make a difference.
NOTE: the bullets you have are as consistent in weight and dimensions as any swaged bullets and are very accurate.
Here is my data for a box of 500 115gn L-SWC bullets:
Weight (gn) Quantity
115.3 1
115.4 0
115.5 2
115.6 4
115.7 7
115.8 12
115.9 30
116.0 25
116.1 49
116.2 28
116.3 34
116.4 42
116.5 35
116.6 17
116.7 11
116.8 7
116.9 14
117.0 18
117.1 13
117.2 14
117.3 13
117.4 32
117.5 15
117.6 11
117.7 17
117.8 12
117.9 4
118.0 2
118.1 2
118.2 2
118.3 4
118.4 10
118.5 4
118.6 8
118.7 0
118.8 4
118.9 3
119.0 4
119.1 1
119.2 0
119.3 1
Total bullets = 512
Accuracy was "the same" whether I only shot lightest, heaviest, or mixed at 25 yards.
 
Cool! Thanks for the the advice! I’m newish to reloading and had done some Berrys plated bullets and then decided to try Precision bullets, and just happened to place some on the scale and was wondering if the differences mattered. Good to not only see that it doesn’t matter, but that the tolerances are very good.

Great to learn something new!

Thanks everyone!
 
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