Diana Stormrider, took some tweeking, think I have it....

cycbb486

CGN Ultra frequent flyer
Rating - 100%
30   0   0
When I first bought the rifle it was shooting awesome 5 shot groups at 10 meters indoors. Then I did the dreaded reading up about it and some of the accuracy tweaks.

I added a regulator. It still shot great.

The next step was the possible rough edge of the barrel on the chamber end. I could not use my barrel crown chamfer tool as I did not have a pilot that would fit the .177 barrel. I used my scope ring lapping compound and lapped the rough edge off the chamber and muzzle end. Put it back together. The dang thing would not shoot consistently.

The search began again for more pellets to try. Now I have a collection of JSB 7.33, 7.87, 8.44, 10.34, and 13.43 gr. I also have some Stoeger 8.64gr. Some Sig 7.71gr and some H&N ??? Cannot remember the grains. Anyways the rifle would really tease but just nothing consistant anymore. The Stoegers would be fine for hunting. The HandN way to hard to chamber so did not like them. Each weight of pellet would tease but on different days.


I decided I F'd the barrel up so ordered 2 more barrels to try. Again things would not seem consistent. Teaser but would toss nasty fliers. So I decided to wash pellets and relube with a light oil. Still no luck.

This entire time I was playing with torque settings on the 3 bolts holding the rifle into the stock. Would use 1 then 2 then 3 then try another combination and no luck. Removed the barrel band completely. No luck. Tried it in different locations ahead of the stock no luck. AUGHHHH.

Decided to measure skirts and weigh. To tedious a task. More tedious than shooting short range BR. So I opted for washed and lubed pellets.

Next step could be play with Tranfer port size. Well I cannot machine my own ports so I asked a buddy. Things have not panned out on that part yet.

Bottom line the most consistent pellet being the 13.43 JSB. But out of 20 shots which I feel is the sweet spot for this rifle I would get maybe 5 NASTY fliers. Okay it must be pellets. Oh well I am not getting into sorting. I will take it for what the rifle is worth. I ruined what I had by trying to make it better.

Being stubborn and loving ACCURACY another tip was to clip some coils off of the main spring and use a buffer if memory serves me right. So I just went and clipped 4 coils off. Reassembled and things were going BANG. Ran the pellets over the chronograph at about 10" and was running single digit spreads at around 790FPS with the 13.43gr JSB. so I knew at least velocity was consistant.

Things improved after clipping coils to a point I said I can live with it for a 300.00 PCP.

I decided also along the way to try another scope. Still did not seem to help.

Then yesterday something told me to take the thread protector off of the muzzle and try it like that.

Well dang it.

We were back in business. The rifle shoots just like day one if not better. Whew thank you Lord. Now it is fun to shoot it again. Besides needing to fill after 24 shots I am pleased again. No more F'ng with it.

I have shot 3 targets with it at 10 meters(all the room I have for indoors) with the muzzle protector off and this is what it will do.

https://photos.app.goo.gl/qGJKmQDKV5risGV98

I likely will not change TP out. Just live what I have and dave for a REAL air rifle.

The other final tip I tried after reading here on CGN was using Pledge for lube on the pellets. That is what I use now after washing and drying. When I clean the barrel I pull patches thru with Kroil. One dry patch then a good soaked patch with Pledge. Let sit a bit then 1 dry patch and shoot it. The first shot goes where it is.supposed to in the 10 ring......

👍👍👍
 
I’ve read some guys have added a second barrel support band closer to the end of the stock and it apparently helped as there’s been some issues with barrel droop.
 
I just bought a .22cal one of these (neutered 495 fps version)... How does a guy (with a PAL obviously) change it back to normal ?
Is there parts I need to buy, or do I have to modify the exiting ones to get the FPS to 800-900 ?
I'm already looking into milling a new pocket for the *barrel band, close to the front of the stock to eliminate the drooping barrel issue.

* side-note, the screws on the barrel band were loose (allowing the band & barrel to move slightly) upon inspection after unboxing (brand new).
Possible reason for the erratic accuracy claims. But I concur, the band should be closer to the muzzle - like the pic below.
I plan on relocating it to between the end of the stock & before the start of the checkering, to retain the 3mm mounting screw.

Thanks in advance.

GbLh1MR.jpg
 
Last edited:
I just bought a .22cal one of these (neutered 495 fps version)... How does a guy (with a PAL obviously) change it back to normal ?
Is there parts I need to buy, or do I have to modify the exiting ones to get the FPS to 800-900 ?
I'm already looking into milling a new pocket for the *barrel band, close to the front of the stock to eliminate the drooping barrel issue.

* side-note, the screws on the barrel band were loose (allowing the band & barrel to move slightly) upon inspection after unboxing (brand new).
Possible reason for the erratic accuracy claims. But I concur, the band should be closer to the muzzle - like the pic below.
I plan on relocating it to between the end of the stock & before the start of the checkering, to retain the 3mm mounting screw.

Thanks in advance.

GbLh1MR.jpg

Start with opening up the transfer port 4.5mm to 5mm. Check your FPS and if you want more, get a stiffer hammer spring. You may want to turn down some brass rod and make a heavier hammer.
 
I’ve read some guys have added a second barrel support band closer to the end of the stock and it apparently helped as there’s been some issues with barrel droop.

I ordered a second barrel band, and a shrouded fill-port with gauge... Waiting on a carbon 4500 PSI fill station also, got a shipment notification today.
 
Start with opening up the transfer port 4.5mm to 5mm.

So here's the transfer port... PIC BELOW
I've seen pics of stock & modified ones, mine's now the same or a bit bigger than an un-neutered Stormrider port.
I drilled it with a 5/64" bit (2mm), my smallest 1/16" bit (1.6mm) wouldn't even fit in the stock "neutered" hole.
So drilling it out to ~4.75mm or 3/16", would've been way too much I think. I might go as high as 3mm, we'll see.
Here's a before & after.

ScX7hqP.jpg


FKSqCCj.jpg



Second barrel band showed up too, cut off the swoopy Dovetail extension - sanded it down - painted it black. Looks like stock, and even has a mini pic-rail on the bottom !

sHlq3Uq.jpg


UGjE72Q.jpg
 
Last edited:
So drilling it out to ~4.75mm or 3/16", would've been way too much I think. I might go as high as 3mm
Bob Sterne, Technical Editor at Hard Air Magazine published an article,"The Effect of Port Sizes on PCP Airgun Power"(September 10, 2018).
A stock port of 3.5mm on a .22 Beeman Chief will get just over 800fps with 18.1 JSBs. increasing the port size to just over 5mm got the same gun well above 950 fps with the 18.1s.

If you want power, you can drill close to your pellet diameter...any bigger and your pellet will nose dive into the hole.
 
Back
Top Bottom