Pellets weight diffirence (JSB 33.95gr)

[zan89]

Hi,

In curiosity started to weight one tin of JSB pellets heavy 33.95grains.

I tought i will get around 0,3gr diffirence max betwen them. Actualy there is 1,3grain diffirence. Suprised of that and wondering what mean this variation on 100yards. That will be next test.

 

[Enkey]

Hi Zan

Now you can also measure the size of your heads from each weight group and you will be even more surprised

Regards

Enkey 

 

[zan89]

Not shure if i want to.. then i will left maybe 5 pellets of each diameter and weight. So bairly be able to make 5 shoot group  

Then i would need 100 tins to get 1tin of all same.

 

[Robransom]

For the jsb 25 redesigned in .22: Generally I find that there are 3 to 4 different head sizes in each tin, via air gap measurement tool! Variability in weights is 1.631-40, 1.641-50, 1.651 - 60, 1.661-70, and a few that are over or under those weights. At 100 yards it does make a difference; that is if you can hold steady and have no wind! What no wind? 

Zan89 - you are correct about needing a lot of tins to get consistent pellets. Buying in lots that are large enough helps - think sleeves or cases.

Also - Time! Have fun in your pursuit of perfection.

 

[WAGMASTER]

Zan87, You've only just started down the rabbit hole ;~Þ lol 

One thing that helps me is you know those little hot sauce containers Taco Time uses, they make great sorting containers. ;~) 

 

[jtnm]

I’ve had over 20 different weights out a batch of tins. Yes 100yds and beyond it will make a difference. Here’s a video with some data

 


https://youtu.be/i1oOtLE0wbo

 

[triggertreat]

I'll add my sort results of the MKIIs to the pile. I didn't see this one prior to creating another thread. I am sorting mine in 0.20 grain increments back into the tins. I think that is good enough, and don't believe the scales are accurate enough to go much below that.



This is five tins of 300 count JSB MKIIs combined. A little easier to view instead of multiple charts trying to compare. This will eventually become 8 tins combined for a better view of the tins overall.

You can see in the Master list and the Main sort list all weighed pellets including the 4 odd balls with a total spread of 2.66 grains. The left row shows all weights that came in below 34.00 grains, and on the right the ones above 34.00 grains and their spreads with the 4 odd balls removed.

The counts are also noted in 0.20 grain increments for both base weights. On the 34 grain and above, there are 384 from 34.00 to 34.20, nice. Also, 298 at 34.21 to 34.42, another nice, and so forth. The extra heavies, or lights will be used to play with, while the bigger counts will be used to tune and shoot with.

I plan to check my zero when changing to a different weight class tin, and from there I should be good for lots of shots in that weight class.

 

[Patrick]

Ive noticed that differences a few years ago when I’m shooting with my .25 Bobcat.

since then I’ve bought a pellet sizer from krale, but I’ve no serious testing done yet.

 

[biohazardman]

 

Looks like you are ready for the next step. https://pelletgage.com/ Has some stuff you might be interested in.



https://www.youtube.com/watch?v=B0Df7yXK88Y



https://www.youtube.com/watch?v=U-IYa7mWPCg



The Yrrah roll test is next. Although unlike Tom I quit measuring all of the heads before roll testing, now I only check a few from each tin, because the JSB 33.95 have been so consistent in head size and anything unusual will show up in the roll test. Just sorting, weighing and doing the roll test will really improve your groups.



https://www.youtube.com/watch?v=_o0vq__b60g



PS this is why I only shoot the NSA slugs now. They are so close in weight and size that I just don't bother with sorting anymore.

https://nielsenspecialtyammo.com/

 

[Patrick]

Looks like you are ready for the next step. https://pelletgage.com/ Has some stuff you might be interested in.





https://www.youtube.com/watch?v=B0Df7yXK88Y







https://www.youtube.com/watch?v=U-IYa7mWPCg





The Yrrah roll test is next. Although unlike Tom I quit measuring all of the heads before roll testing, now I only check a few from each tin, because the JSB 33.95 have been so consistent in head size and anything unusual will show up in the roll test. Just sorting, weighing and doing the roll test will really improve your groups.





https://www.youtube.com/watch?v=_o0vq__b60g





PS this is why I only shoot the NSA slugs now. They are so close in weight and size that I just don't bother with sorting anymore.

https://nielsenspecialtyammo.com/

Now I’m using the .25 only for plinking at short distances. But with my impact .30 I really want to get a slug liner with the NSA Slugs.what do u think are the best weight for the .30?

 

[triggertreat]

This is the final result of eight tins of 300 count JSB MKIIs weight sorted and combined.

From the "Master list" you can see the full spread of 2.66 grains from all tins including the four odd ball pellets that were outside of the 33 and 34 grain base weights. Moving to the right to the "Left Row" column, you can see the spread of 0.90 grains for all pellets that weighed less than 34 grains, minus the four odd balls that threw the spread wide initially. To the right of that column, the "Main Sort" column, is where you can see the full spread of 1.88 grains for all eight tins without the four odd balls, and is a better view of the overall spread. To the right of that column, the "right Row" column, you can see the max spread of 0.95 grains for all pellets above 33.99 grains.

The counts for each base weight is also shown broken down into 0.20 grain increments, and is how they are placed back in the tins. There are some really nice piles like the 645 count of the 34.00 to 34.20 weights that will fill more than two tins and so forth. I knew with sorting eight tins there would be some nice high count piles. 

I spent a good amount of time developing the spreadsheet and the best way to go about this, and sorting the pellets, but it was a fun project while the weather and the C-19 are stealing the show. This also gives a good view of what to expect from these tins. From what I see, it's a good idea to sort these for better long range accuracy. At closer 30 yard or less ranges, it's probably not worth the effort, but maybe when grabbing a 32.40 grain and then the next pellet grabbed being up closer to 35 grains.

The very first tin I sorted had all four of the odd balls in it, including a metal mag pellet. After that the max spread remained the same, and they all looked to be just normal weights from the moulds. One tin did have an excess amount of lead dust. Very similar to a graphite coated tin of pellets when looking at fingers. The rest were fairly clean. "It was like a box of chocolates" going through these tins. I have no plans to roll these.

 

[triggertreat]

All done and back in the tins safe and sound. I'll probably just shoot up the ones still in the bins first being very careful to avoid a disaster. It was a fun project, but time to move on. I may post some groups later...

 

[luxurycat]

Good Vid..Thank you..

 

[triggertreat]

Yes, thank you very much for the video. Your notes confirm that sorting mine down to 0.20 grains per tin will all maintain the same velocities within each tin of weights.

 

[ackuric]

You can expect roughly a 1 fps difference per .1 grain, but really the lighter the pellet you shoot the more difference it'll make compared to heavier pellets due to the variance being a larger sum of the total pellet weight. 33.95's are pretty notorious for having 1.5-2gr difference which ultimately can be 15-20 fps difference alone.

 

[triggertreat]

You can expect roughly a 1 fps difference per .1 grain, but really the lighter the pellet you shoot the more difference it'll make compared to heavier pellets due to the variance being a larger sum of the total pellet weight. 33.95's are pretty notorious for having 1.5-2gr difference which ultimately can be 15-20 fps difference alone.

Thanks Matt!