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Makes perfect sense! I ordered some more 20.2 gr in .216 and threw in an order for .2165 just to see if they will work any better. The .217 in 20.2gr is a shotgun pattern so I don't have high hopes for the .2165 20.2 but I'll see. On a side note I measured the rifling in my Avenger barrel at...

Thank you all for the replies. That's a very detailed video and I'm glad to have watched it. I do not have a micrometer, just digital calipers. But I do have a target and the ammo so I set it up at 30 yards and tested the ammo as suggested. As shown but just to clarify: top row left to right...

Copy paste of what was said above. I don't buy pellets from Pyramyd not cause they're bad but because their markup is nuts. Even with the buy 4 get 1 free AND a coupon, Trenier is STILL cheaper almost every time. Only downside to Trenier is they don't have every brand like H & N.

Another vote for Trenier. Very well packaged and quick email replies and shipping.

Interesting, I thought slugs needed very good contact with the rifling in order to be stabilized and be accurate. You think even the .216 may be too big? Can you please share why that is? I am trying to learn the most I can! I only just sat down at a bench yesterday and rough sighted in at 30...

Hey guys, I just slugged my Avenger barrel. I have polished and put a crown on it previously using @nervoustrig methods and just now opened the barrel port to 5mm and installed a weaker poppet valve spring and use a heavier hammer spring. Took some photos of some ammo I have and yes I...

Scroll up slightly and see post #77. It is for sale on ebay

https://www.airgunnation.com/threads/notos-o-ring-list-lets-put-them-all-here.1296224/

Update: I shoot in my backyard and the new spring and higher psi just make this too loud. Those #'s were impressive but I can't justify the noise. I went back to my 18.13 gr around 935 fps. In curiosity I shot the 25.39 at the same tune of 2.4k with about 5 HS and wow those things spiraled like...

I am shooting these And yes this spring is a huge difference. It is very strong and was nice it came in red powder coat and I got the light valve spring too but didn't install that. It gets good #'s and speed just is so loud at that power. I've tried going again starting lower reg and seeing...

Yeah I just shot a bunch of the FX 5.52mm 25.39 gr this weekend. With the 20cc plenum and the heavy hammer spring installed , at 2.6k psi and 3 HS I was able to get 50 fpe (940s) The spring from ebay is very strong. At 2.1k psi and HS backed out, it shot 840 fps which was max fps I got with the...

Very cool stuff, and also very scientific. Its a lot of fun to experiment with different designs and see hard data you can actually compare everything to. You make that from scratch? I've only used Fusion 360 so far but it's been great. Is open scad easy to use? I had a question though, if it is...

Or this one uses 3 cartridges and claims to shoot 100 before needing to swap. Also has magazines! Would be able to sit down for a long time and keep shooting. But again I don't own this just heard good things about Diana Diana TrailScout

Agree with the above about distance. Beeman QB78, I do not have one but have heard good things.

Ebay listing If you can find it on Ebay it'll tell you if you can get it to France

Bummer... was really hoping to use these 25.39 gr. to get more than the 35 fpe I could get out of my Doux plenum and the 18.13s. I ordered these springs : https://www.ebay.com/itm/185812002783 But probably will only do the hammer spring cause I really don't want to fully disassemble this thing...

Wonder if that means they're softer than normal redesigns so they can expand better? Idk my Crosman Premier are also shiny but are hard. Tin vs lead vs other making up composition

That's great. My tin of the monster hades were all very clean pellets. Shiny.

Anyone know why a .22 Avenger would not be able to push a 25.39 JSB more than 800 fps with a 20CC external plenum? I could do 930 fps with a 18.13 JSB with the Doux 11 cc at 2.2k reg and 3.5HS and thought the 20cc would let me shoot the 25.39 just as fast. Tried all regulator settings like 2.2...

Wow upper 40s for fpe that's great, did they expand at all?