Umarex Notos...my notos can't group heavier slugs

Yes sir, they do. I'm not a fan, too much force on that little pin in plastic.
Did you notice a velocity difference between the V1 single hole TP breech for the FX kit and the V2 (3 holes in a recessed channel)

I'm getting significantly lower velocity with V2. But, much better accuracy
IMG_20250118_140332591.jpg
"V2"
 
Originally on this thread I showed how bad the notos was grouping with bigger pellets. I noticed when loading anything bigger than 13.43gn they did not feed smooth, almost felt like scraping. Anyway, I know all guns prefer certain weights and brands but the discrepancy between the 13 and 18 grain slugs @ 20 yrds made no sense so I finally sent the Notos back.

Gotta say Umarex handled it quickly and in about a week they sent me out a new rifle. Wasn't expecting that, thought they would do some work on the chamber or something. Anyway, first 5 shot group I shot @ 20 yds with 18.13gn JSB's was awesome!!! Group is high because it's actually sighted in for 13yds...distance from my back door to target.

Well I am happy as hell I can shoot heavier slugs now just fine!! The groups are about the same size of the pellet themselves :)

1000008524.jpg
 
Originally on this thread I showed how bad the notos was grouping with bigger pellets. I noticed when loading anything bigger than 13.43gn they did not feed smooth, almost felt like scraping. Anyway, I know all guns prefer certain weights and brands but the discrepancy between the 13 and 18 grain slugs @ 20 yrds made no sense so I finally sent the Notos back.

Gotta say Umarex handled it quickly and in about a week they sent me out a new rifle. Wasn't expecting that, thought they would do some work on the chamber or something. Anyway, first 5 shot group I shot @ 20 yds with 18.13gn JSB's was awesome!!! Group is high because it's actually sighted in for 13yds...distance from my back door to target.

Well I am happy as hell I can shoot heavier slugs now just fine!! The groups are about the same of the pellet themselves :)

View attachment 538590
That's more like it!
 
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Did you notice a velocity difference between the V1 single hole TP breech for the FX kit and the V2 (3 holes in a recessed channel)

I'm getting significantly lower velocity with V2. But, much better accuracyView attachment 530353 "V2"
i imagine the all the transfer ports before the barrel tp are transferring near equal psi and then when that air gets to the barrel tp with the multiple ports, that air pressure drops in psi because now there’s space to expand. that drop in psi in the barrel transfer port even if very little will definitely affect your muzzle velocity.. kind of like a nicked barrel o-ring on a single tp barrel.
 
gine the all the transfer ports before the barrel tp are transferring near equal psi and then when that air gets to the barrel tp with the multiple ports, that air pressure drops in psi because now there’s space to expand. that drop in psi in the barrel transfer port even i
yes, the volume of the channel between the barrel ports will cause a drop in pressure, just didn't expect the results to be so dramatic, went from getting 845fps with the 18.13s to 800. Doesn't matter anymore, that's an old post. I sold the notos today.
 
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