JSB Exact Express

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JSB Exact Express

Postby Zero4k on Fri Jun 08, 2012 3:38 pm

JSB Exact Express 5.52 14.35gr

I ordered a couple of tins of these and they arrived this morning. I weighed 150 of them from one tin during lunch and managed a quick 24 shot string, the lightest was 14.18gr and the heaviest 14.54gr which is a 0.36gr weight variation - pretty good I reckon for mass production and certainly a helluva lot better than some I could name!! These are in the new tins so I assume the they are the latest batches. I'll get around to weighing the lot when I have a little more time and if I'm still as happy with them I'll get a few more tins in.

It was (and still is) too damn windy outside to do any meaningful shooting so I limited myself to the 10 yards I have in the garage. I picked out 24 identical weights of 14.36 and entered that as 14.3 on the Combro, here's the results:

Image

Not too bad for a sub 12, I am constantly amazed at the low shot spread, especially for a non regulated air rifle :D - it's miles better than some regulated ones out there. I had to drop 5 clicks on the elevation turret to compensate for these pellets - noted for when I use the 15.9 FX again.
FX Royale 400 .22 - FX Verminator MKII .177
Zero4k
 
Posts: 575
Joined: Mon Sep 13, 2010 8:59 pm
Location: Derbyshire uk

Re: JSB Exact Express

Postby Zero4k on Tue Jun 26, 2012 6:42 pm

JSB Exact 15.9gr is a superb pellet, but they are not really giving their best at 570 fps, their real starting point is 800-900 fps up, obviously a sub 12 - or more accurately an 11.5/6 ft/lb, air rifle can't take full advantage of their potential and although they are very accurate, we end up with a very limited effective hunting or target range compared to .177 over here.

JSB Exact Express 14.3gr, again a great pellet, Their best velocity appears to be between 700 to 800 fps up, but the legal maximum for the uk (non fac) is around 600 fps - but it's still 30 fps better than the 15.9's and does give a bit flatter trajectory. Again they are very accurate!

The JSB Exact RS / Falcon accuracy plus 13.4gr, These start coming on song at around 650 to 750 fps, the uk legal velocity for these is around 620fps so it's not too far off the starting point - 50fps faster than the 15.9's might not sound like a lot but it makes a very noticeable difference and works well.

My rifle produces the following and I'm sure most other people's will be about the same at uk power levels:
FX / JSB Exact 15.9gr - 11.54 ft/lb - energy at 30yds 9.062 - at 50yds 7.71
JSB Exact Express 14.3gr - 11.49 ft/lb - energy at 30yds 8.70 - at 50yds 7.23
JSB Exact RS / Falcon acc+ 13.4gr - 11.47 ft/lb - energy at 30yds 8.68 - at 50yds 7.21

The above figures do vary slightly, these are averages from a spreadsheet of shot strings.
So, not much of a power loss using the lighter pellets, and much better trajectory, wind affects will vary but as they will be in the air for a bit less time I think this will be partially canceled out. Although obviously not as flat as a .177's trajectory it's better, as a comparison here's some .177 numbers

JSB Exact heavy 4.52 10.3gr - 11.50 ft/lb - energy at 30yds 8.62 - at 50yds 7.68

I have stopped using the 15.9s in favor of the JSB Exact Express as my main pellet for both target and hunting use - they are equally effective if not actually better due to the increase in velocity. The Falcons I am still trialing for hunting, they are great for target work but I just want to make sure they will be good for hunting at greater ranges than I have used the 15.9's at - my guess is they will be pretty good.

Anyone else who has an opinion or experiences on this would be most welcome, the more info the better!

Regards, Ian
FX Royale 400 .22 - FX Verminator MKII .177
Zero4k
 
Posts: 575
Joined: Mon Sep 13, 2010 8:59 pm
Location: Derbyshire uk

Re: JSB Exact Express

Postby Zero4k on Sun Jul 01, 2012 9:34 am

Image

Grabbed another 2 tins for weighing, results as above, variation 0.56gr - if we exclude the two lightest and heaviest extremes 0.44gr. These are the new red and black tins, I've classed these as 14.3gr, but the tin states 14.35gr.
FX Royale 400 .22 - FX Verminator MKII .177
Zero4k
 
Posts: 575
Joined: Mon Sep 13, 2010 8:59 pm
Location: Derbyshire uk


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