.25 JSB King Heavy MKII Deviation in Weight

[bdzjlz]

I have always really appreciated the .25 JSB King Heavy 33.05 grain pellets and the groups that it affords through my Air Arms S-510.

Today, I received from Pyramid Air my first tin of .25 JSB King Heavy 33.95 Grain MKII pellets, "300" count.

This evening, I hand weight all of the pellets, sorting them into three different batches; <33.75, 33.75 to 34.15, and > 34.15.

This tin actually had a total count of 307 pellets in it.

I had a few pellets that were just shy of 35 grains. 141 of the 307 weighed in excess of 34.15 grains. 24 of the pellets weighed < 33.75 grains. 142 of the 307 weighed within the 33.75 to 33.15 grain range, or within +/0 .2 grains of the advertised 33.95.

The first calm day that I get when I am available, I will shoot side-by-side groups of the Standard King Heavy pellets vs the MKII and post photos of the results on this forum.

 

[addertooth]

The batch I measured had remarkable consistency in head size, but a surprising amount of weight distribution. 

 

[Kinetic45]

And this is why I buy/bought 22 tins of 300ct, 33.95 for my 2018 shooting (thank you Trenier Outdoors!) and after cleaning them in solvent to remove the admittedly minimal but still some lead dust and flakes I then lightly lube* the pellets to prevent corrosion even though I store them in screw top balm containers (just like pellet tins).

I sort them in the evenings while watching TV, takes about two weeks.

I have found that unsorted my 50 FPE Marauder w/ 3K fill (Hill valve n .187 porting w/ JSAR SSG n plastic hammer) will group 8 shots (I shoot a whole magazine for my groups) around 7/8" at 50 yards but if using sorted pellets the groups shrink and will be at most 3/8' time after time.

So taking the time to sort by weight is absolutely worth it for tighter groups and basically reduces fliers (which will cause larger groups of course!)



* I was using synthetic two cycle oil and E85 gasoline as the solvent/lube at 30:1 and it works well but recently I have gone back to just washing with plain solvent, drying then using a 50/50 mix of Rooster Jacket/water where I dip the pellets, shake them in the strainer to get excess out of the bases and then dry them on a window screen which leaves a translucent waterproof wax. No corrosion, does not attract dirt and shoots very nicely with big intervals between accuracy drop and then cleaning.

 

[nervoustrig]

I just noticed your thread and remembered I did a sampling a while back just to get a sense of how much variance there is. 3 different tins, 20 pellets each.

http://i.imgur.com/8XckePn.gif

http://i.imgur.com/QYf0VxM.gif

Certainly could be some outliers in the tins but this sampling didn't raise any red flags to entice me to investigate further.

 

[jwrabbit123]

welcome to the world of mass production , i always wash my pellets with warm water and dawn and dry then check skirts then weigh and sort by sizes and i sort to .001 I fo get 8 sizes out of a tin and then some lights and heavies i use for plinking or target , But I also cast ammo and I have to sirt them as well .I do notice some tins better then others I guess it depends on dies and plants