EVOL .22 Paradigm Slug Tuning

[Bladebum]

Just got back from the range. At 50 yards the Zan .217 23 grain and 25.4 grain, as well as the knockouts shot a single ragged hole. Pushed target out to 100 and adjusted the scope. All three slugs patterned like a shotgun! Velocities were all consistent with the highest SD being 8fps. A little frustrated I decided to see what the FX 25.4 grain pellets would do at 100.....and slather me up with honey and call be a doufus.....a single ragged hole!

To say I was shocked is an understatement, but I repeated it with 2 more groups, as well as letting my shooting buddy try and he did the same.

My buddy is going to play with his press and make some slugs that have different bases to see if those work.

I will keep playing and letting you guys know what is happening.


I am interested to see if one of the new barrel systems would work on this rifle. Really want thus gun to shoot slugs at 100 yards and beyond accurately.

Yep, exactly why its pointless to test slugs under 75 yards, have had so many promising slugs at 50 only to watch them look like I picked up a bunch of gravel and hurl at the 100 yard target.

Bump that reg to 2300ish, adjust the hs from 10-15 lower than max on that reg pressure and try out some h&n 23 and 25 grain .217 size. I'd also run some patches through the barrel. That gun will shoot slugs id bet money on it!

 

[Woogie_man]

Will give that a try the next range session. Was starting to fill up and didn't want to be "that guy" that hogs a bench.

The rifle shows promise for sure, just need to crack the code.

 

[Woogie_man]

All three slugs patterned like a shotgun! : ( well that sucks!

do they need to be pushed harder or just not the rite barrel for the jobs?

I did adjust the power a bit and hit a wall. I need to bump the regulator up a but. That will be for next range session.

 

[Air86]

I always thought that barrel was made for the 20.2, gr maybe that's the problem

 

[Airgun-hobbyist]

Bladebum is correct, slugs look good up close and loose stability at longer distances. I'd try some rebated boat tail slugs in there. They usually have a proportionally shorter bearing surface that regular slugs, stabilize around the center like a football, and have more weight. (These slug types work great long range in the Slayer.) Also, keep it in mind that the barrel is likely choked for pellets. The Evol HPS is a different animal, made for slugs, and the barrel you need for the Paridymn to not be slug picky.

Measure the barrel's twist rate and plug in the appropriate numbers here and see how the stability is with the slugs that you are testing.

Barrel Twist form

 

[Woogie_man]

Awesome forum!!! Will play around with it and see what it comes up with.

Maybe Tom will be able to chime in and let us know the twist rate as well.

 

[American Air Arms]

1:18. If you run SF you will find its within norms upto 32gn. I believe the issue is the CG/CP of the current bullet designs. They rear weight biased which tend to require a faster twist rate despite of what the calculators will say. If you can find a less pointy slug with a gas check style base they will shoot lights out in the 1:18.

 

[Woogie_man]

Like I mentioned my shooting buddy has one of the Corbin presses and is going to play with a few designs and see if we can't find something.

Sf???

Couldn't figure how to post just the file, so here is a screen shot. This was all the chronograph data for half the shooting. This was from the new Garmin unit, and exported to my phone. All different slugs tested today, along with some of the FX pellets.

 

[American Air Arms]

SF = Stability Factor. You have some serious velocity swings in the beginning of your string sheet. It looks like it calms down around # 40. All the same slug?

 

[pan60]

are all the slugs hollow points or are some solid? are the solids to heavy?

 

[Woogie_man]

SF = Stability Factor. You have some serious velocity swings in the beginning of your string sheet. It looks like it calms down around # 40. All the same slug?

No that was all the slugs together, so 3 different slugs and some pellets at the end. Forgot to restart each string with the change of ammo.

 

[Woogie_man]

are all the slugs hollow points or are some solid? are the solids to heavy?

They are all hollow point

 

[CTAirgunner]

@Woogie_man I always use this calculator when checking SF but have found that like Tom said up to 32ish grain shows promise when running the calculator but not performing as so when shooting the common airgun slugs.

Twist Rate Stability Calculator

Our newly updated Twist Rate Stability Calculator not only tells you what your SG is, but it also lets you know if you are reaching your optimized BC.

bergerbullets.com

 

[Conecrusher]

Hey Bladeburn!

You mentioned "jts 22.07 pellets" Perhaps I need to be dipped in honey and called a doofus but what does that mean?

Mike

 

[Bladebum]

Hey Bladeburn!

You mentioned "jts 22.07 pellets" Perhaps I need to be dipped in honey and called a doofus but what does that mean?

Mike

Jts is the brand and the pellets are .22 cal , 22.07 grains. Probably the best long range pellet I've ever shot. Has a high BC (for a pellet) and impacts on game are substantial. Out of mine and my brothers EVOL 15" they are lights out accurate in the 900-940 fps range.

 

[Conecrusher]

Jts is the brand and the pellets are .22 cal , 22.07 grains. Probably the best long range pellet I've ever shot. Has a high BC (for a pellet) and impacts on game are substantial. Out of mine and my brothers EVOL 15" they are lights out accurate in the 900-940 fps range.

It seems obvious now that you point it out. That is just the way they are listed on a retailers e- commerce page.

 

[Woogie_man]

Since these shot so great, let's see what we can squeeze out of then. First time really sitting down an using the pellet gage.

 

[Woogie_man]

Here are some pictures of the Corbin Swaging press with some custom slugs. Going to give these a try tomorrow and see what happens. These are all weighing in at 25 grains.

 

[Bladebum]

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Here are some pictures of the Corbin Swaging press with some custom slugs. Going to give these a try tomorrow and see what happens. These are all weighing in at 25 grains.

Very nice, those look very similar to the RMR hybrids in the base and the Ogive. Interested to see how they perform!

 

[Woogie_man]

Well my buddy made me 5 different weight slugs and they did great over the chronograph. All produced a standard deviation of 4 fps. Velocity ranged from 970-945 fps for weights from 25 grains too 27.5 grains.

50 yards the groups were literally a single hole and shocking......though at 100 yards, like bladebum mentioned above.......was like a shotgun again. NOTHING I did helped the slugs in any weight with any velocity.

Again went back to the Fx 25.4 grain pellets and made a single hole at 50 yards, and opened up a little bit at 100 but still all within the black of a 10m airgun target. So good enough for the NRL22 match this Sunday.

I will hopefully have some video coming of the shoot as well as some pictures. Will be fun to see how the rifle does in the cold.


I will say that I had a failure with the rifle today. I took the rifle and left it in my truck all day, from 0445 - 1430 at a temp of around 15°. Brought the rifle to the shooting tube and checking the tank pressure noticed my cover for the gauge fell off! Easy fix as I found it in the rifle case and will glue back on. From a full fill at 0445 this morning at 3000 psi, the pressure when I started shooting was just over 2000 psi. Started. Shooting right away WITHOUT warming anything up, and at 50 yards it was a single hole still.

Tom this thing is a TANK and has no problem in the cold so far. I will be locating some critters to shoot soon as well, and will be getting a report about rhat as well.