Tuning Leshiy classic Huma reg setting question

[SwissTrees]

I scoured various forums threads but it was difficult to find someone matching my caliber and barrel length that wasnt sub12 and the few I could dig up they were so old the images of shot string results were no longer available to view.

So just put a Huma reg in the Leshiy Classic. Have a few questions.

1. I thought I read that they come from factory set to 110 bar? Mine (at least from the sticker) showed a random setting of about 127?
I ended up turning it down so the marking said 110 bar so I assume that's where its set. With that said Im trying to figure out my next step.

I'm running a 250mm in .22
I ran it over the chrony and here were the results with the first peak looking like HST 11? This was with JSB 15.89gr

HST#	FPS	AIR USED
1	601-603
2	633-631
3	674-673
4	683-684
5	718-712	5.3-5.1
6	738-748	5.3-5.2
7	782-772	5.3-5.6
8	803-817-818-812	5.7-5.6-5.8-5.8
9	847-848	5.8-6.5
10	872-876	6.5-6.5
11	888-893	7.3-8.0
12	891-889	11.1-11.1

From reading around the forums, its seems my best setting with reg set at 110 would be around HST 9 or 10 correct? (just below the peak) That's where in theory it should be the most efficient/best shot count for that setting?

I kind of want it shooting the 15gr around 815. (so level 8-ish)
My question is where should I be setting the reg to for optimal shot count and consistency? Would I want to lower the reg setting at this point to move my peak efficiency down a little into the 815-820 range? Or am I going about this wrong lol.


EDIT: SO I guess I'm asking if lowering the reg setting lowers the peak(most efficient FPS) range? Where as increasing the reg setting will move that ideal FPS range higher? Im running out of 15gr pellets to use for testing lol so I would like to reduce my trial and error as much as I can and at least get on the right direction.

 

[Scouty]

You're at ~95% of first velocity peak at HST 9.

But you want it a bit slower so set it at HST 8 & shoot it a bunch while the regulator settles in.

I find the 22/250 setup a bit twitchy at that power level. Shoot it a bunch & see how consistent it is & how accurate it is. Also check for any increases in speed as it comes off the regulator.

 

[ctshooter]

My experiences with the Leshiy Classic and conversation with Brian at EdGun West have lead to the LC liking a slighty higher reg pressure. Especially in .177. The reason is that you are going from a very large transfer port in the stock to a smaller barrel entrance. A touch extra pressure helps there.

That being said I would agree with what Scout says. Shoot it for a bit to let the reg settle in. If your shot power remains the same after a few hundred shots you could probably then lower the reg to around 100 and then be in your peak range. But in reality you're fine where you are at 90% of max. Maybe you get one or two extra shots with the lower reg.

Great little shooter. Enjoy it.

 

[SwissTrees]

Yes I agree going above 800 with the 250 in .22 starts to feel twitchy. Ill have to check accuracy tomorrow when its light out. I'm running low on my 15gr pellets so I was just trying to see if Im going in the right direction before wasting any more rounds shooting them into a pellet trap over chrony.

So you think the reg (it is brand new) will settle in a little higher than my respective power setting in the end? So Im fairly close to my efficiently level if I put it at HST 8 just as it right now it seems.

 

[SwissTrees]

My experiences with the Leshiy Classic and conversation with Brian at EdGun West have lead to the LC liking a slighty higher reg pressure. Especially in .177. The reason is that you are going from a very large transfer port in the stock to a smaller barrel entrance. A touch extra pressure helps there.

That being said I would agree with what Scout says. Shoot it for a bit to let the reg settle in. If your shot power remains the same after a few hundred shots you could probably then lower the reg to around 100 and then be in your peak range. But in reality you're fine where you are at 90% of max. Maybe you get one or two extra shots with the lower reg.

Great little shooter. Enjoy it.

Yeah I ended up getting this gun passed down to me and knew nothing about it just a few weeks ago. So I have been reading and learning as much as I can. Sometimes its hard to dig through old forums (some of which don't even seem to be active anymore) and images or charts wont even load to view lol.

Ok ill try and shoot it a bit more and let the reg break in. Was just making sure that I was going in the right direction (lower reg setting = lower peak FPS range). Im using this LC under 50 yards, mostly 30-40 so I'm fine with taming it down a bit for more shot count. Also less muzzle pop (sound and actual recoil twitch being .22 and 250mm)

 

[Scouty]

Yes I agree going above 800 with the 250 in .22 starts to feel twitchy. Ill have to check accuracy tomorrow when its light out. I'm running low on my 15gr pellets so I was just trying to see if Im going in the right direction before wasting any more rounds shooting them into a pellet trap over chrony.

So you think the reg (it is brand new) will settle in a little higher than my respective power setting in the end? So Im fairly close to my efficiently level if I put it at HST 8 just as it right now it seems.

I have certainly had Huma sub-12 regulators settle in & shoot a bit faster but I don't recall the same thing happening with the standard Huma.

If you were way off of your goal I'd say go ahead & turn the reg down now. But you're so close I say shoot it & see how it settles in.

And with a bit of thought, I would actually shoot a few strings at both HST 8 & 9.

 

[weevil]

My 177 350mm has Huma at 110bar. It is tuned for Zan 10grain slugs at 910fps at 94% of the hammer peak. However, I also like to use it for plinking little targets with CPHPs, which involves clicking the HST down 5 so they shoot at 890fps. Those little targets are grains of corn at 50yards - it’s that good. What I’m saying here is that the accuracy of the LC doesn’t seem to be affected by running it (substantially) below the peak (14.5fpe vs 21). It’s an amazing little gun and I wish I could buy two more.

I hope you got around to modding the trigger. It makes a world of difference.

 

[SwissTrees]

My 177 350mm has Huma at 110bar. It is tuned for Zan 10grain slugs at 910fps at 94% of the hammer peak. However, I also like to use it for plinking little targets with CPHPs, which involves clicking the HST down 5 so they shoot at 890fps. Those little targets are grains of corn at 50yards - it’s that good. What I’m saying here is that the accuracy of the LC doesn’t seem to be affected by running it (substantially) below the peak (14.5fpe vs 21). It’s an amazing little gun and I wish I could buy two more.

I hope you got around to modding the trigger. It makes a world of difference.

I tried doing it. Got the plunger screw from the link and it jammed in the grip It would never get in the right spot no matter how hard I tried to make little 1/4 turns. It was either too short where trigger wouldn't hit 2nd stage b4 going off or too long where gun wouldn't re cock. I didnt have the little spring in the grip though. But I tried pressing on it manually and pulling the trigger as if there was spring tension and still couldn't get it to re cock. Trying to figure out how to back the screw out now.

On a side note, Thats why tried the Huma reg as I started having very erratic accuracy with JSB's that used to be one of the most accurate. Im talking POI shifts of 3 or 4 inches at 30 yards. I could see the pellets spiraling off. Checked the scope/mount rings/etc, none of them were loose. Locked it in a vice and still had wild groups. Checked the baffle for any clipping (Never once had clipping issue before though). Almost wondering if I got a bad batch of JSBs. They were not deformed and didnt seem to have any issues in other guns I tried. Loaded some Hades in and those shot well. Hopefully I can get some more testing in tomorrow.

 

[weevil]

I tried doing it. Got the plunger screw from the link and it jammed in the grip It would never get in the right spot no matter how hard I tried to make little 1/4 turns. It was either too short where trigger wouldn't hit 2nd stage b4 going off or too long where gun wouldn't re cock. I didnt have the little spring in the grip though. But I tried pressing on it manually and pulling the trigger as if there was spring tension and still couldn't get it to re cock. Trying to figure out how to back the screw out now.

On a side note, Thats why tried the Huma reg as I started having very erratic accuracy with JSB's that used to be one of the most accurate. Im talking POI shifts of 3 or 4 inches at 30 yards. I could see the pellets spiraling off. Checked the scope/mount rings/etc, none of them were loose. Locked it in a vice and still had wild groups. Checked the baffle for any clipping (Never once had clipping issue before though). Almost wondering if I got a bad batch of JSBs. They were not deformed and didnt seem to have any issues in other guns I tried. Loaded some Hades in and those shot well. Hopefully I can get some more testing in tomorrow.

I also had some issues with the plunger. I ended up taking out the plastic tip where the trigger contacts and then stretching the spring inside, which increases its travel. I used two of these springs (interwoven) under the plate:

Trigger Spring | Talon Tunes

Trigger Spring

talontunes.com

 

[Scouty]

EDIT: SO I guess I'm asking if lowering the reg setting lowers the peak(most efficient FPS) range? Where as increasing the reg setting will move that ideal FPS range higher? Im running out of 15gr pellets to use for testing lol so I would like to reduce my trial and error as much as I can and at least get on the right direction.

I think I was posting my reply when you added this edit. I'll post a chart put together by another AGN poster. Same projectile but different barrel length than yours but I do think this provides an interesting conceptual guideline to your questions.

On this chart the number in red represents approximately 95% to 97% of the first velocity peak (FVP) for any regulator setting and the corresponding HST setting for the regulator pressure.

Notice that when the regulator is at 110 bar it produces 833 FPS at HST 12, which is about 91% of FVP. The right column under regulator pressure represents bars of air used per shot. For the 100 bar setting and 91% of FVP it is using 6.6 bar of air per shot.

Now look back at the 95 bar regulator setting. This is the regulator setting that produces 833 FPS when at that 95% sweet spot. In this case it is using 7.4 bar of air per shot.

So at 110 bar the Leshiy uses less air per shot to produce 833 FPS than when at the "ideal" setting of 95 bar.

So why would one choose the 95 bar setting over the 110 bar setting?

The two main reasons would be that at 95 bar the Leshiy in question may shoot with less FPS spread than the 110 bar setting while still on the regulator.

The second reason is that the 95 bar setting may allow the Leshiy to shoot in the FPS range to allow a few more shots whereas the 110 bar setting may spike in speed when coming off the regulator.

So the 95 bar setting may allow more consistency and allow a few more shots when coming off the regulator. So even though it is using more bar per shot it may have the higher effective shot count.

I know you want to get close to your answer with shooting a little lead as possible but every regulator and hammer spring is different. You're only going to figure this out by shooting and recording shot strings.

I hope this helps.

 

[SwissTrees]

So got out and did some testing. Consistency seems to do well. Accuracy on a lot of them not so much? This was all at the 110 bar and HST-8. This was at 29yards gun placed in a shooting rest/sled. 10 shots each except the HN silverpoints that were sooo bad I gave up on them lol.

Hades 15.89	JSB 15.89	JSB 18's	H@N match 21.14	RSW points 14gr	HN silverpoint 17.13
795	796	767	687	833	762
796	795	767	692	835	764
794	795	770	693	831	763
801	798	766	695	835	759
807	801	771	694	834	764
799	798	708	688	830	762
794	800	779	698	834	quit shooting
799	805	768	701	833	-
805	803	777	703	834	-
799	805	770	699	836	-

Going to play around with the Hades at different speeds as well as the two JSB's. RWS I could see them through the scope curving all over. Same with the HN silver points. What's funny is as I mentioned previously the first tin of JSB 15gr I had last week was like one ragged cloverleaf at the same distance. Not sure if I got a bad tin or a different head size? (both were bought off Amazon) and pellets were all in good shape. There was hardly any wind today either.

 

[SwissTrees]

I think I was posting my reply when you added this edit. I'll post a chart put together by another AGN poster. Same projectile but different barrel length than yours but I do think this provides an interesting conceptual guideline to your questions.

On this chart the number in red represents approximately 95% to 97% of the first velocity peak (FVP) for any regulator setting and the corresponding HST setting for the regulator pressure.

View attachment 392760

Notice that when the regulator is at 110 bar it produces 833 FPS at HST 12, which is about 91% of FVP. The right column under regulator pressure represents bars of air used per shot. For the 100 bar setting and 91% of FVP it is using 6.6 bar of air per shot.

Now look back at the 95 bar regulator setting. This is the regulator setting that produces 833 FPS when at that 95% sweet spot. In this case it is using 7.4 bar of air per shot.

So at 110 bar the Leshiy uses less air per shot to produce 833 FPS than when at the "ideal" setting of 95 bar.

So why would one choose the 95 bar setting over the 110 bar setting?

The two main reasons would be that at 95 bar the Leshiy in question may shoot with less FPS spread than the 110 bar setting while still on the regulator.

The second reason is that the 95 bar setting may allow the Leshiy to shoot in the FPS range to allow a few more shots whereas the 110 bar setting may spike in speed when coming off the regulator.

So the 95 bar setting may allow more consistency and allow a few more shots when coming off the regulator. So even though it is using more bar per shot it may have the higher effective shot count.

I know you want to get close to your answer with shooting a little lead as possible but every regulator and hammer spring is different. You're only going to figure this out by shooting and recording shot strings.

I hope this helps.

Yes I had found that chart before, knowing it was in the 350mm but thanks for the quick explanation of WHY the numbers fall where they do and what they mean. Helps alot

 

[Scouty]

Consistency looks good.

Have you shot until you are below regulator set point?

I suspect you're probably best off staying where you are unless you decide you want to give up some power for a more stable Leshiy. Even then I would recommend leaving the regulator as is & shooting strings at a lower HST.

I neglected to mention that I agree with @weevil - the Leshiy seems to do well with HST settings well below the 95% point. I have seem dramatic spikes off regulator but that was well below the FVP.