ART BARREL DAYSTATE RW HP AND JSB PELLETS

[edosan]

Here is a tip, few months ago I publish this https://www.airgunnation.com/topic/jsb-monsters-redesigned-22

I just want to share a real test I made with 2 different batch JSB Monsters .22 shooting out of the daystate ART barrel.

This is a group at 75 meters shooting the monsters @ 850 fps, "Deep Base", I get also a very similar group shooting those @ 1000 fps

Nothing spectacular, actually kind of bad (5 shot group)

So let's fix the speed with the programmer

and now, let's change the JSB batch, from deep base, to flat base, if you take a normal look, they are about the same, right?

But now, let's look at the base:

and the real test, accuracy @ 75 meters, 5 shot group with flat base JSB Monster @ 1000 fps (yes very fast!)

yes, a big BIG WHOW!!!!

Hope it helps.... if you wonder: is there any way to know from a closed tin of .22 jsb monsters redesigned if it is deep or flat base???, saddly no. Last time I bought 12 tins of those, 5 came with flat base and 7 came with deep base.

IMPORTANT: Other airguns / barrels like more the deep base, and other shoot both ok. And if you want more confusion, there is a third base, this picture was published by Claudio Flores a while ago, that shows the other

PS: I could keep this to myself to get an advantage in BR Comps, but no, is not the way I am

 

[sonny]

excellent post, Thanks brah!

 

[nomojo65]

I found this out about a yr. ago and made reference to it and no one seemed to pay much attention to this?, I even took pics as well, I figured O’well their loss! But you spend a lot of money to get the right lot of these!!!, also same for the 18’s in my RW anyway! This is common in all jsb’s I’ve noticed? Don’t know if it’s different die’s or die’s not in spec’s? I also believe some Barrels are more sensitive to this than others? If your willing to take the time you could machine a adjustable probe which would allow you to shoot any inner skirt “well” depth you wanted! it also seems more of a issue with poly barrels than land and groove barrels? Another way around this is to cut the lead back some allowing fo pellet to seat further into breach, this is similar to bullet seating depth in cf having a impact on accuracy... my two cents anyway! 

 

[nomojo65]

I also wonder if pellet is closer to transfer port causing several different issues? I think you know where I’m going with this... a deeper depth skirt means pellet is seated closer to the TP, and many issues with this! It seems to be prevalent in pin type pellet probes IMO. I drove myself crazy trying to figure why my RW was acting so erratic after I went through my first lot originally purchasing pellets (6 tins) ordered more and didn’t shoot for Sh..t! Ruled out gun went to pellets after! Found this issue. One contradiction to this is the deep dish FX slugs? They shoot great out of my gun?

 

[edosan]

Good points my friend, actually I am working in a deeper pellet probe to check that

 

[nomojo65]

Please let us know how it goes because I’ll be first in line to buy one from you also want to say your a better man than Me I spent a lot of time and money figuring this out and I will take any advantage I can in competition! (Trust me I need it!) No different than F1 or many Other machine/human based competition’s!

 

[tibor]

dang big difference in pellets..if your a competitor pretty much have to be selective in shooting pellets.

pretty cool you shared that Edosan...

 

[nomojo65]

One more note: there is a less expensive and time consuming way to test this, which I used for my RAW but is much Easier to do because of the much larger space in this action vs the RW! ( think Thomas! )

 

[edosan]

@nomojo65 I just made preliminary test and YES, deep base need to be inserted a bit further in the barrel...I did manage to make sub moa groups just doing that.

 

[nomojo65]

I have no machining skills or I would make a adjustable probe, so I could use the mag.! I have to seat manually to achieve desired depth! Pain in the butt!

 

[edosan]

Not really, use a small allen key, and you will find out

900fps deep base (normal)

Same, inserting the pellet a bit further with a 3mm allen allen key

Out of light, Tomorrow I will continue

 

[nomojo65]

I made a seater a few mo. Ago I used some plastic material I had on hand

 

[Corvid_hunter]

Excellent thread. Thanks for the info gentlemen. Unfortunately I have 10 tins of the pellets it doesn't like.

 

[Corvid_hunter]

I made a seater three mo. Ago I used some plastic material I had on hand

Hi. How much deeper did you make the pellet seat? Can you post a pic of your invention?

 

[Pulpit]

Thanks for sharing, I will have to pay more attention when opening up new tins. Makes me wonder if JSB does this on purpose to make us buy twice as much ammo than what we need.

 

[Corvid_hunter]

I wonder what the Daystate version of these pellets are like.

 

[nomojo65]

I made this originally for my BM-500, (Very Crude!) It was to test this theory, worked “ok” gave me the info I was looking for... Also used this for testing in the RW, but very Awkward to use because I have to remove SS tray to use it properly! To time consuming for Comp. but already working on version 2! I really think an “adjustable” probe is the Only way to Truly take advantage of this? fiddling with a seater just doesn’t cut it for Me anyway! For testing, it did it’s job...! I first noticed this I believe in the days of the USFT Brand guns made by the guys in Cal. Then the early days of the Thomas rifles, he manufacturers a adjustable One now. There are many on this forum who have vast more knowledge in these Ideas and theories than I ( just need them to read this and chime in!) Therealld, Mike of Thomas air, Arzrover, azuaro, just to name a few.

 

[Spray1Mark]

Hope it helps…. if you wonder: is there any way to know from a closed tin of .22 jsb monsters redesigned if it is deep or flat base???, saddly no. Last time I bought 12 tins of those, 5 came with flat base and 7 came with deep base.



Very interesting Edosan, am I correct in thinking you don't get the "batch coding" labels in the USA on JSB tins? giving you all the information on die number, inspection, run etc. etc?

 

[edosan]

Hope it helps…. if you wonder: is there any way to know from a closed tin of .22 jsb monsters redesigned if it is deep or flat base???, saddly no. Last time I bought 12 tins of those, 5 came with flat base and 7 came with deep base.



Very interesting Edosan, am I correct in thinking you don't get the "batch coding" labels in the USA on JSB tins? giving you all the information on die number, inspection, run etc. etc?

Not in the new tins with screw cap I got 

 

[sonny]

I made this originally for my BM-500, (Very Crude!) It was to test this theory, worked “ok” gave me the info I was looking for... Also used this for testing in the RW, but very Awkward to use because I have to remove SS tray to use it properly! To time consuming for Comp. but already working on version 2! I really think an “adjustable” probe is the Only way to Truly take advantage of this? fiddling with a seater just doesn’t cut it for Me anyway! For testing, it did it’s job...! I first noticed this I believe in the days of the USFT Brand guns made by the guys in Cal. Then the early days of the Thomas rifles, he manufacturers a adjustable One now. There are many on this forum who have vast more knowledge in these Ideas and theories than I ( just need them to read this and chime in!)

Very interesting