How much difference does.4g make in accuracy?

[Pete Wass]

Have any of you tested loads that were .004 gn off a desired load. It gets to this .02 gn zone when using a V4. ,02 gn below and .02 gn over could give .04 gn swing. I always want exact chosen load but how much difference is a potential . 04 gn swing going to make in 100 yd groups?

 

[jelenko]

Which cartridge? I.e., how many grains in the load?

 

[newbieshooter]

in my loads, .04gr equates to about ~4fps. If I loaded every round exactly the same (.000gr swing) - I'm probably going to see more than 4fps difference between shots? I'm not sure 4fps would make any difference in accuracy?

 

[Bob3700]

The size of the case will dictate if ur range of powder wt. variation will affect accuracy.
.04 gr variations in a 308 will impact accuracy less than that variation in a 223.

 

[SD guy]

338 Remington Ultra Mag your not likely notice a significant difference. 17 Hornet, perhaps something that you could see a difference at 100 yards if you are not in the middle of a node. Relatively few of us are going to be able to measure plus or minus .02 grains

 

[joshb]

None.
Just my gut reaction. .004 is a piece of dust.

 

[Medic505]

And 0.04 is 2 chunks of Varget more or less. At 100 yards I'd be shocked if that margin made a difference. But, I've been wro....wron.....wron.... mistaken before.

 

[SpencerC87]

In a 308 with a 185 jugg and N150, .04gn equals about 1.8fps. Also known as sweet f*** all.

 

[newbieshooter]

Have any of you tested loads that were .004 gn off a desired load. It gets to this .02 gn zone when using a V4. ,02 gn below and .02 gn over could give .04 gn swing. I always want exact chosen load but how much difference is a potential . 04 gn swing going to make in 100 yd groups?

I guess I'm a bit decimal confused.

1. The title says .4



2. then you ask if any has tested loads that were off by .004 gn

3. then you ask how much difference will .04 gn swing make?

 

[Bill Norris]

Have any of you tested loads that were .004 gn off a desired load. It gets to this .02 gn zone when using a V4. ,02 gn below and .02 gn over could give .04 gn swing. I always want exact chosen load but how much difference is a potential . 04 gn swing going to make in 100 yd groups?

Maybe not a lot at all considering in a .308 sized case sometimes going up in powder charges by .2 & .3 tenths of a grain will show either the same speed or only a few FPS difference. And sometimes the higher charge will show a lesser FPS.

 

[M-61]

The title says .4

That’s four tenths. Chargemaster measures to one tenth. In my 30 Br one tenth is fine, really fine. Four tenths I am going to say NO. 100 yards in the ones. If I were 4 tenths off, I’d say it’s not going to work.
So is it four tenths? Four hundredths? Four thousandths? Huge difference.

 

[gpoldblue]

Have any of you tested loads that were .004 gn off a desired load. It gets to this .02 gn zone when using a V4. ,02 gn below and .02 gn over could give .04 gn swing. I always want exact chosen load but how much difference is a potential . 04 gn swing going to make in 100 yd groups?

I'd bet your case weight and volume is varying more than .040"gn. Check it out.

 

[Coyotefurharvester]

If 0.4 grs takes your load out of a minimum(less than 1 bullet caliber) vertical dispersion node at 100 yards, it matters.

 

[64Rambler]

For my 6BRA, I typically run 0.3 gn increments for initial load data with a new powder or bullet. Then I bring it down to 0.2 gn steps. When I find "thee" load I go 0.1 gn over and under. When loading for 100 yd I will take plus or minus 0.02 gn (resolution of the Autotrickler/FX120i). For 600 yd I only take target weight and minus 0.02 gn. For VV N150 0.02gn is usually one granule of powder.
So the OP question of does a 0.04 gn spread make a huge difference? As most have pointed out, no.

 

[Steve Donlon]

Is it .4 or .04.? Headline says .4 and guys do ladder tests with less and find a difference.

 

[SD guy]

Have any of you tested loads that were .004 gn off a desired load. It gets to this .02 gn zone when using a V4. ,02 gn below and .02 gn over could give .04 gn swing. I always want exact chosen load but how much difference is a potential . 04 gn swing going to make in 100 yd groups?

Decimal places matter. you range from .4 to .004 then to .04 grains. please clarify question.

 

[Bob3700]

.4 gr is significant to a competitor. Won’t matter if ur shooting for “ Minute of Deer”.
.04 in a 308 won’t be noticed out to 600 yds. In a 22 Hornet that would show up on any target.

 

[JFrank]

Decimal challenged. lol

 

[DR1586]

For what it’s worth, all of my 600yd and 1000yf ammo for my 6XC and 308 is loaded to a 0.06gr spread, so +/- 0.03gr. It shoots as well as I can hold the rifle and has performed to what I believe is acceptable for winning damn near any match.

 

[DShortt]

I go through a considerable amount of trouble to keep things within .1 of a grain.

If you guys are going to tell me that .004 grain matters......

Well. Anyone up for a game of horseshoes?

Because I'm out.

Find this difficult to believe given that, depending on the powder, 1 or 2 kernels of stick powder equate to .1/grain.