Sorting pellets by viewing

[NoLimits]

Hallo,

I live in Germany. Sorry I do not speak English well. Reading works better. That's why I like to read in this forum from time to time.

I shoot air rifle and air pistol in .177 caliber for many years. I like to share my experience and knowledge that some European sport and benchrest shooters need.

I have tested a lot and compared many factors, but at some point I asked myself the question:

What is it that makes a pellet good ?

Sorting the pellets by weighing, measuring, rolling or washing and lubricating only makes sense for pellets in the lower price range.

As an example: There you weigh all the pellets and still have flyers right and left. So it can not be the weight.

A few years ago I built a test device to look at the pellets. But the most important thing is to look at the pellets while they are moving !



I would like to write this article step by step. First of all, today I will show you good and bad holes on the back of the pellet.



What can you see? Nothing.

What can you see now?

Here are some more examples of good and bad holes.

Thanks, that's it for today.
NoLimits

 

[Sell682]

I agree that a not true pellet will add wobble/vibration kind of like a unbalanced tire on a car. 

 

[Guest]

I agree that a not true pellet will add wobble/vibration kind of like a unbalanced tire on a car.

That's one of the things that the YRRAH machine tests. Very good display. Thanks.

A pellet shot through an 18" twist barrel at 850 fps will be turning at 34,000 RPM. What could go wrong?

 

[dizzums]

the worst thing youll run i to that will cause a flier for sure is a pellet thats out of spec diameter .. i bet all those 'sorters' out there completely miss that and its common, ive found under-size to be the most common while slugging and prepping some of my barrels ... so yeah, weight may or may not tell on that ..rolling, not .. wasting your time if you dont get the skinny ones at least ...

 

[bandg]

It seems logical that smaller diameter/lighter weight vs. larger diameter/heavier weight (luck of the draw if unsorted) could produce "fliers". It's not just diameter. It's BOTH, IMO.

 

[tor47]

I do not compete, and do not sort, or weight, but that us interesting 

 

[Beginner]

so where can we buy the tool? and how much money?

 

[Guest]

so where can we buy the tool? and how much money?

Called a Yrrah pellet roller... Read the last part. No really, read part 5, last post, EDIT Note..

 

[Guest]

the worst thing youll run i to that will cause a flier for sure is a pellet thats out of spec diameter .. i bet all those 'sorters' out there completely miss that and its common, ive found under-size to be the most common while slugging and prepping some of my barrels ... so yeah, weight may or may not tell on that ..rolling, not .. wasting your time if you dont get the skinny ones at least ...

I do not want to hijack this man's thread because his machine is very interesting and I want to know more about it.

I believe you do get the "skinny" ones. I think you are saying that rolling won't sort the smaller diameter ones out if the head to skirt ration is the same. I think I have managed to make a proof that shows rolling WILL sort those out (for the most part). I dropped that proof at the end of part 5 earlier this evening. I am still waiting for better minds to review the proof but I think it is a good proof.

 

[Franklink]

This is very interesting! Watching those unbalanced ones spin makes me think you might be on to something. 

 

[nomojo65]

Nolimits, I think your device is very interesting and well designed for testing exactly the inner skirt eccentricity for pellets, just because the outer skirt of the pellet looks concentric really doesn’t matter that much! I don’t think weight and head diameter or lubricant play a major role in keeping pellets stable? I believe it’s velocity and eccentricity that plays the biggest role?

 

[Xbowsniper]

Nation, 

I've done EVERYTHING known to man to make my projectiles the best that they can be.....I do have to say....this is a GREAT way to "balance" them, so to speak....I'm going to investigate this....I'm intrigued!......

Tom Holland 

Field Target Tech 

Fieldtargettech.com 

 

[NoLimits]

Hello,
thank you for your interest.
Today I would like to go a little step further.
(I will show you my test machine a little later. Have a little patience.)

First, I would like to show you a real example of a pellet with a slanted rear end. This does not happen often, but even with premium pellets this defect can be slightly present.

The rear end is slanted and wobbles.

In my other test machine, the pellet is skewed and the axle wobbles.

Finally, an illustration to think forward and backward.

Now it's weekend, I'll get back to you soon.

NoLimits

 

[NoLimits]

Hello, 
step by step we work our way from the back to the front to the head. 

Today I'll show you the shifted cones.

This defect is not present in all makes. AA and JSB pellets rarely have this defect.

That's it for today. Next time I will show you what to look for in AA and JSB pellets to achieve better precision or to avoid fliers.

NoLimits

 

[NoLimits]

Hello,
today I make the last step. I'll show you the most common mistake that can cause poorer precision or a flyer with pellets.
If the head of the pellet is bad, the hit is also bad. More precisely, it is the eccentricity or the concentricity of the pellet head.



A good pellet.

A bad pellet. The head is not centric to the two cones.

As an example, an electronic hit record of many tests I have done.

I wish all those who weigh, measure, roll, wash, and lubricate pellets much success. The fliers will not disappear.

NoLimits

 

[bandg]

This seems like it would be a useful STEP in a process, but doesn't seem to be a final solution. IMO, variances in size/weight could still impact POI even if there was no visible "wobble" in a pellet. But certainly no wobble would be better. How about 1)wobble sort, 2)weigh, and 3)size. Or maybe just shoot from the tin. 

 

[steve123]

NoLimits, send me one of those machines by early next week so I can try it on some JSB 25.4gr 22 cal pellets for the upcoming RMAC 100Y benchrest event Aug 26-29!!!!!! 

 

[NoLimits]

@bandg
I agree that sometimes weighing still makes sense. Same weight means same volume. Different weight means different volume. But how displaced the shape of the bead is (given the same weight) cannot be determined by weight, only by symmetry.

@steve123
There is a little problem there. My machine is for .177 cal (4.50mm). This caliber is the most shot in Germany and Internationally (Olympic disciplines). I have never made a jig for the flat cone of the JSB Jumbo Monster. I would have to make and test a case for cal. 22 Monster first, but that would not be a problem. 

Shipping time and United States customs should be the bigger problem until the Benchrest event on Aug 26.

Maybe praying will help now.

NoLimits

 

[Strever]

are you going to show us or describe what to look for in AA and JSB pellets ?

This defect is not present in all makes. AA and JSB pellets rarely have this defect.
That's it for today. Next time I will show you what to look for in AA and JSB pellets to achieve better precision or to avoid fliers.

NoLimits

 

[rc4fun]

Will you show us a picture of the pellet holder end without a pellet mounted? Just wondering how you center and mount the pellets. Looking at the drawings you insert the pellet through the rod. It would also be interesting to know how you rotate the rod, some type of small motor with belt.

Great insight, thanks