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yesdid you handload them using published load data starting at the bottom of the charge weight?
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yesdid you handload them using published load data starting at the bottom of the charge weight?
thank you.Considering......
1. I didn't even own a caliper for many years while reloading 1000s and 1000s of rounds (both rifle and pistol rounds).
2. A single hair has a diameter of about 0.0047 inches. So, 0.005 inches.....sorry, I'm not overly concerned.
3. I've been lucky (I guess). Or blessed.
The BIGGEST safety factor (for ME)......is about following the recipe in the reloading manual. Most manuals will say to use the "starting load" or it'll say to reduce by x% and slowly work your way up to the maximum (if you're going that far). While also watching for the "signs" of overpressure.
Anyway.......getting back to precise measurements with your caliper. You'll also note that bullets themselves can vary. One brand to the next. Or even within a production lot # and/or product line. Especially with hollow point bullets. Then, things can also change from time to time. Call it tweaking the specs a bit. Sometimes, it's even/also a matter of quality control.
YES....consistency in your ammo makes for better accuracy. But, there is a limit. And many times it's due to many other factors (besides just your ammo).
Good luck with your new hobby/endeavor.
Aloha, Mark
PS.......
LOL......I used my M-1 eyeball for these.
View attachment 1280675
9mm reloads.
Yup....it passed the plop test. BUT, But, but......it didn't feed from the magazine worth a dam.
So.....make sure that your ammo will also feed from the magazine, chamber, fire, extract and eject before you call, "SUCCESS".
Then you will be fine. Variations in seating depth can affect accuracy but as long as the COAL is withing saami spec they are safe using published load data, starting at minimum.
thank you it was answer i was looking for. i knew saami COAL was 1.780 - 2.260. i do know these have a COAL of 1.90-1.91 variation due to tweaking seating depth on my die..Then you will be fine. Variations in seating depth can affect accuracy but as long as the COAL is withing saami spec they are safe using published load data, starting at minimum.
my minimum case length is at 1.350 where i got 35 in my head then typed 35mm lol.I apologize.
I make my share of mistakes too. LOL....WHY was I even looking at load data for the 7.62x39mm and not the 300 Blackout (aka : 300 AAC Blackout or 7.62x35)?
Yeah, just typing that. Gave me a partial answer to my "problem" with/about just thinking. LOL.
Aloha, Mark
PS.....I guess I should also point out.....the fact that my el-cheap-o RCBS dial caliper does readings in inches. While my even cheaper HF caliper will do inches and mm, with just a push of a button.
Progress.
in addition.....In modern bullets, such as the 7.62 illustrated here, the cannelure is pressed into the circumference of the bullet to provide a strong purchase for the mouth of the cartridge case when it is crimped onto that cannelure. This is done to prevent the bullet from moving either forward or backward in the case.
I look at the cannelure "as a suggestion" (not written in stone) for bullet placement within the case. And, since bullets will vary.....I don't pay attention to the cannelure on my brass cases. You'll probably notice them on .357 magnum cases (not so often with .38 special cases).In cartridges, the cannelure is a band pressed into the case which helps prevent cartridge setback when the case mouth is properly crimped onto the cannelure. Bullet setback of .1" can increase pressure beyond safe limits and possibly cause a catastrophic failure
not sure these are cannelure. here is the image of lapua 123 gr but has 1 more grooveI assume you mean.....
"ribs" on the bullet = cannelure (3 bullets on the right)
View attachment 1280887
and the cannelure concept/word.....could/can/is also used for cases too.
View attachment 1280886
According to Wikipedia.
in addition.....
I look at the cannelure "as a suggestion" (not written in stone) for bullet placement within the case. And, since bullets will vary.....I don't pay attention to the cannelure on my brass cases. You'll probably notice them on .357 magnum cases (not so often with .38 special cases).
Aloha, Mark
I assume you mean.....
"ribs" on the bullet = cannelure (3 bullets on the right)
View attachment 1280887
and the cannelure concept/word.....could/can/is also used for cases too.
View attachment 1280886
According to Wikipedia.
in addition.....
I look at the cannelure "as a suggestion" (not written in stone) for bullet placement within the case. And, since bullets will vary.....I don't pay attention to the cannelure on my brass cases. You'll probably notice them on .357 magnum cases (not so often with .38 special cases).
Aloha, Mark
here is my projectile and a finished case minus primer and powderI assume you mean.....
"ribs" on the bullet = cannelure (3 bullets on the right)
View attachment 1280887
and the cannelure concept/word.....could/can/is also used for cases too.
View attachment 1280886
According to Wikipedia.
in addition.....
I look at the cannelure "as a suggestion" (not written in stone) for bullet placement within the case. And, since bullets will vary.....I don't pay attention to the cannelure on my brass cases. You'll probably notice them on .357 magnum cases (not so often with .38 special cases).
Aloha, Mark
Understood, my new dilemma, @Pepe-lepew gave me a load data from Vihtavuori. saying COAL 1.976?.005" is nothing to worry about, heck a normal bullet can vary in profile resulting in .005" fairly often. Lapua's are pretty uniform though so I wouldn't expect much of that but will happen every so often I'm sure.
.010" might start to concern me. Depending on the load and load volume. Once you get into the .0625" territory (deeper/shorter) then I'd be concerned for sure. A load this much shorter (depending on the case) can increase pressure as much as 10k psi chamber pressure.
Now.. If its .005" further out absolutely no sweat. Further out should lower pressure until maybe if your jambing the bullet in the lands which would probably wouldn't fit in a mag. Jamming the bullet in the lands gives no bullet jump and from what I understand can cause a sharper spike in pressure because the bullet doesn't have any room to slide out with minimal resistance while pressure slowly builds up. Think of diving into water vs falling on concrete then adding pressure on top of that.
but generally I'd much rather them be slightly longer than shorter. Hopefully this helps.
my worry now is am i too deep on seat? just optically it looks right? and within saami spec?You should also be able to check for jam by putting sharpie all over your bullet loading it into the chamber normally and then extract it, if the bullet sticks in the lands and pours powder everywhere (congrats ) its too long. OR it will usually put some small marks showing bare metal around the bullet and then you know its touching the lands.
For me, I like to know what my jam length is before starting loading. So I know how much room I have to play with. Most folks don't care, and for shorter bullets like 55gr fmj's people just load them to length to where the cannelure groves is at the case mouth crimp it and go and call it good. If your loading for accuracy with longer heavier bullets, then you might want to play with seating depth for optimal accuracy.
So I wouldn't change course mid stream, probably ideally I may have started with the lapua recipe from the start but its also just a guide.Understood, my new dilemma, @Pepe-lepew gave me a load data from Vihtavuori. saying COAL 1.976?
im between min 1.90-1.915 on this batch i have
in this pic you see my load and lapua lead next to it if i pull depth back out to 1.976 thats 60 thnds longer i feel that bullet will not be deep enough? Or by chance am i way overseating this?
any help is greatly apprciated
View attachment 1281040
Agreed this is paramount. Can result in kaboom. Proper neck tension with out a crimp should be .002" smaller than bullet dia. (-).003" max!ME.....I don't want the bullet "telescoping" into the case or moving just a little (to change things up).
You can see that the bullet base is BELOW the neck in that pic.Understood, my new dilemma, @Pepe-lepew gave me a load data from Vihtavuori. saying COAL 1.976?
im between min 1.90-1.915 on this batch i have
in this pic you see my load and lapua lead next to it if i pull depth back out to 1.976 thats 60 thnds longer i feel that bullet will not be deep enough? Or by chance am i way overseating this?
any help is greatly apprciated
View attachment 1281040
Yeah good call! Both inside and outside.I did zoom that pic and noticed a Heavy Burr on the neck from the trimming.
You need to remove that burr BEFORE loading.
jmo,