SIDE BY SIDE: 30 CAL JSB and 30 CAL JTS
I have been testing and comparing these two brands of ammo for several weeks and want to share my results with you guys. JSB is one of the leaders in air gun ammo sales. There is a video worth watching that shows their operation. They produce millions of pellets. The vid runs around 49 minutes and if you have not viewed it I highly suggest you take time to learn what an operation they run. Link for the video:
JTS is a new comer to pellet production and making a giant splash in a very short time. I don’t know of a video posted of their production facility, if there is one I would like a link to it . I either read or heard that Bob Sterne (on the GTA and other forums) had input in the development of the 18.2 grain .22 cal ammo and the center of gravity had been relocated. I have not heard if he was working to develop the .30 cal also.
DISCLAIMER: This comparison was shot with a chocked barrel. Your results may be different then this post if shot from an unchocked barrel. Tom, the owner of American Air Arms built the Evol to shoot JSB at around 830-900FPS. Ownere have has success with slugs but it means regulator adjusting and other tweaks.
Test Results and other insight
Price, always a consideration
The last order of JSB from PA was 4 tins. Get 1 free and pay for 3. Use promo code and get 10% off. Add taxes and shipping and total ran 68.38$. 600 pellets at .114Cent per.
Order of 4 tins of JTS were 60.95. The buy 3 get 4th free was available but no promo code, maybe in the future (I hope.) 400 pellets were .15cent per.
Not much difference but it adds up in the long run.
Quality Control
JTS has nailed this! My plan was to weigh all 4 tins once they arrived. The first tin was weighed and 96 were spot on at 45.1 grain. 1 was 45.2, 1 was 45 and 2 were 44.9. I didn’t bother to weigh the other 3 tins.
JSB has been going down in quality for some time now. In the past a spread of 44.2 to 45.3 was a good tin. The last large order of 10 tins (1500 pellets) were off the chart in actual weight. They ran from 43.2-45.9. Why are they labeled as 44.7, there were not very many 44.7 in the total count. The highest concentration were 44.9-45.4. Nod goes to JST for QUALITY
Chrony Numbers
JSB JTS
Avg FPS-890 Avg FPS-904
ES 5.72 ES 8.61
SD 2.14 SD 2.44
Measurements
JTS—Length .375” Head diameter--.3005” Skirt--.305”
JSB—Length .375” Head diameter--.3015” Skirt--.307”
My thoughts on the lower avg speed has to do with head size. I can feel a difference when closing the chambering the JSB. It takes a little extra push to seat. I believe the tighter fit adds a bit more friction and thus the slightly slower FPS.
I hope this is helpful to someone, I will continue to test. I really like the thought of never having to weigh another pellet!
I have attached photos of several groups shot side by side on the same morning. Both were under 1 inch CTC. Also, I placed a 100 yard target used for the GTA NUHC at 125 yards just to see what I could do.
Turned out to be pretty dang good. I plan to share this post on a few other forums so you may see it again somewhere. Thanks for reading my post!
yes, even have smoothbore tests vs varying twist rates and barrel lengths. Irons vs this scope or that scope. Varied yardages. The work turns into extremely useful information. My D.O.P.E. books and apps help a TON when someone asks: what they should use to do certain things. my favorite test so far was the .22 showdown using 40gr H&N slugs!
