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

[ZekeZX10]

Has anyone experienced very inconsistent groups with heavier slugs? I've tried about 10 different pellets and 5 different slugs and best I've found for mine is the 13.43gn JSB's.

Everything else groups like poop.

I don't mind shooting the 13.43's but would be nice for some heavier options. Thought it had something to do with the feeding, seems to be rough loading anything but the 13.43gn but tried single loading and no different.

Any thoughts? Stressing me the f*&% out

These pics are from only 20 yards and the circles are 1/2" ...so I don't understand how they can be so bad at only 20 yards.. I've taken quail twice at 50+ yards with the 13.43gn but even at 35yards anything heavier than the 13.43gn the groups are horrendous.



These are the speeds I'm shooting at, didn't chrono the 15.89 though

 

[RabbitofCaerbannog]

Has anyone experienced very inconsistent groups with heavier slugs? I've tried about 10 different pellets and 5 different slugs and best I've found for mine is the 13.43gn JSB's.

Everything else groups like poop.

I don't mind shooting the 13.43's but would be nice for some heavier options. Thought it had something to do with the feeding, seems to be rough loading anything but the 13.43gn but tried single loading and no different.

Any thoughts? Stressing me the f*&% out

These pics are from only 20 yards so I don't understand how they can be so bad. I've taken quail twice at 50+ yards with the 13.43gn but even at 35yards anything heavier than the 13.43gn the groups are horrendous.

View attachment 522951View attachment 522949View attachment 522950

These are the speeds I'm shooting at, didn't chrono the 15.89 though

View attachment 522954View attachment 522953

18.13 JTS, 15.89 AEA, 16.08 jts. Perfectly

 

[RabbitofCaerbannog]

This is a 45 yard target with 18.13jts between 755 and 766.. with the stock barrel back on.

Top left bull are the first shots after re attaching the stock barrel and the mounting the scope had to zero. Every single group is 5 shots. Top left bottom right and left are 2 groups. Once everything settled well and I got in a groove.. so is top right. 1 10 shot group. The one outside that ring was sccidently single loaded CPHP. All shots single loaded.

 

[RabbitofCaerbannog]

Has anyone experienced very inconsistent groups with heavier slugs? I've tried about 10 different pellets and 5 different slugs and best I've found for mine is the 13.43gn JSB's.

Everything else groups like poop.

I don't mind shooting the 13.43's but would be nice for some heavier options. Thought it had something to do with the feeding, seems to be rough loading anything but the 13.43gn but tried single loading and no different.

Any thoughts? Stressing me the f*&% out

These pics are from only 20 yards so I don't understand how they can be so bad. I've taken quail twice at 50+ yards with the 13.43gn but even at 35yards anything heavier than the 13.43gn the groups are horrendous.

View attachment 522951View attachment 522949View attachment 522950

These are the speeds I'm shooting at, didn't chrono the 15.89 though

View attachment 522954View attachment 522953

Make sure the scope rail isn't giving slight left to right movement. This happened to me early on. Everything would be perfect. Then 6moa left or right. Random shots all over. The stock rail gives an every so tiny amount of olay. I mounted a dovetail to picatinny 9 slot rail and mounted a cantilever directly to it. Rememedies everything.

Edit: with JSB 15.89 and HN barracuda 15s I did have larger groups like that. When I went to the JTS and AEA pellets. They tightened up in a major way. JTS 18.13 seems to be the most pinpoint. Then AEA 15.9

For me and many others 15.89 Hades function incredible. I just prefer the slightly higher bc of the 18s

 

[graycrait]

@RabbitofCaerbannog , could you post a pic of your rail fix? Old Noob needs a "visual."

 

[RabbitofCaerbannog]

@RabbitofCaerbannog , could you post a pic of your rail fix? Old Noob needs a "visual."

Nevermind the marred up plenum. Replacement on the way. Was forced to wrench on it, may have (did) use the wrong loctite on the drop it used to be married to

 

[ZekeZX10]

18.13 JTS, 15.89 AEA, 16.08 jts. Perfectly

JTS and AEA are 2 brands I haven't tried so I'll pick some up and hopefully my notos likes 'em...thanks for the reply

 

[6gun]

Has anyone experienced very inconsistent groups with heavier slugs? I've tried about 10 different pellets and 5 different slugs and best I've found for mine is the 13.43gn JSB's.

Everything else groups like poop.

I don't mind shooting the 13.43's but would be nice for some heavier options. Thought it had something to do with the feeding, seems to be rough loading anything but the 13.43gn but tried single loading and no different.

Any thoughts? Stressing me the f*&% out

These pics are from only 20 yards and the circles are 1/2" ...so I don't understand how they can be so bad at only 20 yards.. I've taken quail twice at 50+ yards with the 13.43gn but even at 35yards anything heavier than the 13.43gn the groups are horrendous.

View attachment 522951View attachment 522949View attachment 522950

These are the speeds I'm shooting at, didn't chrono the 15.89 though

View attachment 522954View attachment 522953

Have you done the calculations for stabilization factor?

 

[ZekeZX10]

Have you done the calculations for stabilization factor?

no...link info

 

[Firewalker]

Typically, the Notos will not shoot slugs.

Slugs being very different than pellets, the term is not interchangeable. Pellets will have a thin waist and a skirt.

I'm my 10m evaluation shots with every Notos I work on show that CPHP's (14.39gr) , AEA, JTS and JSB 18gr pellets do well in almost all barrels.

My concern is that your gun has a defect causing your issues, not a bad ammo issue.

 

[6gun]

no...link info

Strelok will tell you the. Stabilization factor for the projectile dimensions and weight vs twist rate and velocity. There are other calculators online you can search that so it but you will need to know everything about your given projectile. Theres wiggle room on either end of the stabilization factor that it will still shoot for us if you aren't going long range.