difference in grains

[aznpg]

i just started reloading my ammo for my 9mm just this past weekend. and i noticed that my powder weight varies .4 grains from what the manual says. would it make that much of a difference for the gun? or should i pull the ammo and re-powder them to the correct weight?

[joelogic]

.4 grains can make a difference at the max end. Post some more details. How are you weighing the charge? What load data are you using and why charge it different than the manual?

[Anti-Hero]

Depends on how close to a max or min load you're already making. If it's not at the high end, you'll just end up with inconsistent cartridges. Annoying at best, dangerous at worst.

I'd figure out why your powder is metering so inconsistently and fix the problem.

[aznpg]

as of right now i'm the load data is from lee. reloader is a lee pro 1000. i'm going off the minimal load right now

[Anti-Hero]

What caliber, what powder, what are the bullet specs?

[SixPointEight]

Wait...I think I know what happened.

You're talking about your powder thrower throwing .4gr more than lee said the disc you selected should be?

[pdq_wizzard]

I am going to take a shot here and assume you are using the Lee auto disk?
if so I am also going to assume you mean all of your drops are .4 grans over?

Now we just need to know what powered / bullet combo you are using, if you are on the low end it just might bring you to the low/middle if so that "should" be ok. but if you are .4gr up and down then there is something wrong, I use an RCBS pigyback and my loads might very .1 maybe.

[XDRoX]

Wait...I think I know what happened.

You're talking about your powder thrower throwing .4gr more than lee said the disc you selected should be?

This is my guess as well. OP, you need to give us more information.

[rsrocket1]

The Lee powder chart is off by quite a bit when it comes to density (recommended volume drop and corresponding weight). I know its quite a bit off when it comes to their powder dippers but so are most on line powder density charts.

Since Lee recommends mid ground loads, they will be safe and your charges will be consistent. For example, a consistent 0.5cc will almost always throw the same weight from powder coming from the same can.

I know that for me, Unique comes out less dense than the charts claim (lighter charges than expected) while H335 comes out more dense (heavier charges than expected *potentially dangerous*). In my 45 ACP die set, the 0.5cc dipper is supposed to measure 4.6g of Unique. 0.5cc weighed out to 4.3g which is a pretty light load for 200g LSWC, but it shot fine. The 1.6cc dipper in the .223 set claimed 24.8gr of H335. It actually dropped 25.1g which is near the max recommended of 25.3, but still safe.

Since you know that your weighed charges are 0.4g off, so long as it is not above the recommended maximum or considerably lower than the recommended minimum, just shoot them and see how they work. If they don't shoot well, pull the rest and weigh out the powder for them.

[aznpg]

bullet is 115 gr copper plated 9mm using hodgdon titegroup powder. the powder is going .4 less than what it says on the lee chart. some of reloads is dead on and some are .4 less grains

[SixPointEight]

The charts aren't set in stone. It says on them that powder density may vary. If you're throwing .4gr less than you want, try the next size larger.

[aznpg]

and yes also using the lee pro auto disc

[aznpg]

man now i know why my cousin said reloading ammo was a headache in the beginning lol

[SixPointEight]

If you think this is a headache...sell your stuff now. There's lots to come.

[thai562]

when I reload my pistol rounds, I charged 10% less than the max that the Powder manufacture recommended. That could be .5 to .7 grain, depending on the caliper.
So if you, loaded .4 grain less than max you will fine.
Most important in your case, you want to have enough powder to push the bullet all the way down the barrel. You don't want it to get stuck half way when you fire the second round.

If you want you can test it out, load a few round in the same amount of powder you think you got. Than go to the range and test them out. Fire them at a very close target, just to make sure they reach the target, if all made through your gun, you are good. Take extra precaution.