Copied from Fort Airgun clubs forum, written by Nige (gIllieman)

We got these pellets in from Sportsmarketing available in both calibre's 177 and 22 price is 9.99 for 400 in 22 (10.0 grains)and 500 in 177 (5 grains)



The Thunder bolt is a ultra-high velocity hunting pellet and is best suited for spring rifles! over the chrono useing a Hw99s in 22 it came in doing:-

Test before using superdomes

591-11.2
590-11.2
583-10.9
590-11.2
587-11.1

733-11.9
727-11.7
711-11.2
720-11.5
714-11.3

Which is around about 150 fps quicker than a standard 22 which is something else!!!

Although its described as a air 'pellet' technically it doesn't do it justice its more of an air bullet. Thanks to its unorthodox shape, unique skirt design and hi tech base material, this latest Prometheus shoots at extremely high velocities and is likely to change the way shooters view normal lead pellets in the future.

The main material which is used in these's pellets is Zinc plus Stannum (tin) which makes them a very hard hitting pellet
indeed.
Pic 1 target board


in this pic you can see the damage occured firing a 5 shot group.



pic2 damage to pellets


you can see from this pic the pellets hardly deformed on impact.

Becuse of the the material is made of zinc it makes them significantly lighter than lead which accounts for the pellets high velocity performance over lead. In a 22 legal limit air rifle doing up to 735 fps, and in 177 doing up to 1,039 legal limit rifle which is super fast!!

Usually, lighter pellets lose their momentum in flight very quickly, but thanks to the ballistically superior design of the Thunderbolt, it retains its residual down-range energy much more efficiently, maintaining nigh on the same kinetic levels as its heavier lead pellets at normal airgun distances.
Coupled with its hyper-fast starting velocity, it both impacts the target with maximum strike force and then penetrates much more deeply, making it ideal for pest control-where Prometheus sees the main market.

But there are other benifits, not least the super-flat trajectory that results-in both calibres. In 22 the trajectory is very simular to a heavy weight 177 lead pellet. This may lead to many people answering the final question of the best calibre for hunting to be finally answered.

I used a Hw99s in 22 with open sights i did pull one shot but the grouping isn't that bad.

This test was done on an indoor range,what they perform like on an outdoor range in wind, i will find out next week when we get the .177's in

Like the look and performance of those,would the .177 fit in AA magazine.

Looks interesting, they certainly pack a punch! If the .22 can do that, then the .177 must super quick. If they perform outdoors well then they may put a case for not buying an fac rifle just because of the flatter trajectory. The new falcon pellets are pretty flat and they seemed less sensitive in the wind when i shot with them. I'll love to see an outdoor test mate......

Nice to read one of your reviews again Paul n good to see your on the mend.
Will

Aren't these sort of things usually too good to be true in this cruel world that we live in

Think i saw on their website that they won't be suitable for probe loaded rifles

up to 1030 fps in .177 says chairgun. shame they will probably scatter like rabbits though. good luck with the test.

any news on the .177s?

these pellets are currently only for springers, they actualy goe slower in a PCP, i tried them at pax guns in my brocock last week. however, he is working on making them for PCPs they will be a bit heavier, the info i got off him last week is, the .177 will be a couple of months away.

vic

Yep as vic said the suppliers got lied to

i wonder if the material the pellet is made from will cause premature wear on the rifling? just a thought.
another nice review.

apparently not, in fact they keep the barrel clean, its.
recommended that you clean your barrel before using any of his alloy pellets

im still waiting for the .177 version.

could be a long wait ???

No we got .177 and .22 in tonsy camo, im yet to test them as i still cant cock my 97k

thanks for that paul, im off to pax guns to get some

il try them out on thursday.

vic

These sound interesting, just ordered the .177 version to give them a go.

look forward to your reviews mate

Still not got them yet, although the chap on ebay sent me the .22 version so I posted them in the freeby section.

I gave these ago through my TX200hc in .177 and i've seen better grouping shotguns! According to Hugh Earl they are only designed for 30 yards. But the box is very good, so ditch the Thunder Bolts and put some better pellets in there and give the box the pellets it deserves.

Just my tuppence worth, but haven't we had issues with non lead pellets for some considerable time now. I remember back in the 80's trying the new prometheus pellets and couldn't get them to group through my HW35 although they were better in my mates Vulcan.
If memory serves, non lead pellets are not particularly good through choked barrels (and most airgun barrels are choked - the Vulcan, at the time, was not).

My .177's samples arrived this morning .The only thing is it's rainin cats and dogs Gonna have a go when it dries up.

Well had a go with the prometheus thunder bolt pellets, compared them with JSB exact diabolo at 4.52. Put ten shots through the chrono with each pellet at the target and then ten without the chrono. Pellets where .177, range of target was 25 yrds and shot outside with a very slight breeze up range.

Chrono results in FPS:

JSB exact diabolo

760
762
769
760
763
772
764
779
779
760

Average was 766.8 FPS which is approx 10.94 ft/lbs at 8.44grs

Prometheus thunder bolt

972
940
948
950
939
948
918
938
931
926

Average was 941.0 FPS which is approx 9.79 ft/lbs at 5.0grs.

Found some of the prometheus pellets a bit hard to get into the TX as if the heads where just a tiny bit too big. Below is a picture of the targets for comparison, please note I am not the most accurate person with an air rifle.

ran a few of these through the 410 last night, and must say on first impression's........good!, ran through the mag just fine and very quick over the chrony, 660's i think- only put a few over it.

never put up a target to see how they group, but i was hitting fist sized rocks at easy 80yds......zero wind and a good down hill gradiant, but hitting them never the less, couldn't hit them with AA feilds.

my mate bought them to try them out and next time we're out i'll be giving them another go.

p.s yes........lots of hold over!

Well I recieved a sample pack of these from Iced Tiger (Cheers again fella) the other day and decided to have a play today. I only had 20 pellets to play with but got some suprising results.

Started the run at just a smidge under 150 bar.

I did a ten shot string with AA field 5.52 through my S410 and with a lowest reading of 11.41ftlb - 560 fps and a highest of 11.59ftlb - 564 fps gave me an average of 11.54ftlb - 563 fps.

I then did a ten shot string with the thunderbolt pellets and was quite surprised with what it put out. With a lowest reading of 9.09ftlb - 640fps (think that was a dodgy pellet as the next lowest was 9.20ftlb) and a highest reading of 9.43ftlb -652fps I got the average as 9.31ftlb - 647fps.

Now I thought that was quite a bit of difference between the two pellets. Around 2.2ftlb and 84fps...

Next I did two 5 shot strings with both pellets through my HW97 and the results were as follows...

AA Field lowest reading was 10.59ftlb - 546fps and high of 10.92ftlb - 554fps giving an average of 10.76ftlb - 550fps.

Promethius thunders were a low of 10.27ftlb - 680fps to a high of 10.4ftlb - 684fps giving an average of 10.32ftlb - 681fps.

I thought it was strange how the pellets were so different in the PCP compared to the springer. They gave a lower ftlb reading but a higher fps reading in the PCP where as in the springer the ftlb reading was nowhere near as different but the fps difference was quite different(131fps).

This was just me messing about so dont take these figures as gospel cos I also had youngest daughter helpin dad out too.

With the last five thunders pellets I decided to see how they grouped through the 97. They were shot at 28yds rested on kitchen table and no mentionable breeze. I'm by no means an accomplished springer shooter but I thought they grouped pretty well apart from the one that dropped but that was me twitching.

Anyway picture below.

In no way scientific or certifiable but a good couple of hours fun!!!...