18.13 JSB Differences

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stinkajames

stinkajames

Member
May 8, 2018
176
10
Qld
Hey guys. 

Just opened my latest shipment of 10 tins of 18.13 grain JSB pellets and noticed a big difference in pellet shape. Specifically the rear cavity being a lot deeper and the lines left from the mould more pronounced than an older tin from my last lot. The stickers both say 5.52 head size but have the number 4 instead of 3. I'm assuming this is a mould number? I haven't shot any yet but was wondering if this is common difference between moulds or is it a new mould design? Anyone seen this and noticed a difference in accuracy? The new ones look like the centre of gravity would be further forwards. Any insight would be great. Hopefully they shoot just as well.

James
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Last year, I started noticing difference in the rear skirts also. [.22 cal]
I stopped using JSB for a long while due to too many damaged / inconsistent pellets..

Apparently, Aaron stumbled across not just 2 but 3 different types - all w/ the same lids too.. [.25 cal]

Here's his vid, and hopefully it starts at the 7:20 mark where it needs to.. You'll see the differences:

https://youtu.be/D4VqzaXj-AY?t=439 

The counter bores are different and the wall thicknesses are different. 
No clue if there is a way to tell which ones we could end up with - until they're already bought and in hand.. 

Sam -
 
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The big difference I've noticed here is that the jsb 500 pack is foam packed front and rear with no rattle, cometa branded jsb 200 pack only foam on the top, rattle around and have many more deformed pellets... groups from the 500 pack have generally been more consistent , less flyers and a little tighter, that is with limited/ almost no sorting. so back to my initial question, anyone else got some newer minted jsb and cometa to measure the head size with....
 
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I bought 2 tins of 18.13 at the Mid West Airgun Show. 3 of 4 air rifles preferred 1 tin over the other. The 1 that liked the other tin, a springer,B46 REALLY liked them,it's the best group it has ever shot. 24yds in a steady 8 to 10 ? mph,11 o'clock headwind.Can cover the 5 shot group with a thumb tack, tack dia is .410.These are the old type tins,press on lids. Tin #1(sample size 10) head dia is .219. OAL is .306. Tin #2 dia is .218, OAL .306. measured with 1" mitutoya micrometers.

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