Weihrauch HW100 Advice Needed

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dreamweaver

Member
Feb 16, 2020
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Ohio, United States
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Look what just showed up today....a beautiful Weihrauch HW100T in .177. Excuse the messy workbench. Got the scope mounted and ran a few pellets across the crony. Here’s what I saw:

JSB 14.34 redesigned avg 910 fps

H&N 10.65 avg 995 fps

JSB 8.44 avg 1075 fps

I think this is probably too hot. I don’t need big power. I only want this gun for target shooting and possibly HFT. It’s my first .177, so looking for advice on what to dial it back to. What’s the right velocity for the most common .177 pellet weights?

I found a YouTube video on adjusting hammer spring tension and the regulator. I’ve tuned a few non regulated pcp’s, but no regulated ones....and I’m quite a novice. What’s the right balance between reg pressure and HS given a specific target pellet velocity? Should I be looking to turn the reg down from 120 bar to say 110 bar? 100 bar? How much do I reduce hammer spring given a specific reg pressure? Isn’t the reg pressure what most directly controls the velocity?

I would really appreciate hearing other tips and tricks from those of you who have the HW100. I think when it all sorted out, this is going to be a really nice pcp.



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If you bought it new I suggest contacting the dealer first as to not void any warranty. The dealer I purchased mine from told me they carry a lifetime warranty aside from the seals which is one year. I recently bought a 177 HW100k bullpup and it's shooting around 17fpe which is ideal for 177. 850-900 fps with a 10.34gr would be ideal for yours unless you plan on shooting the 13gr Monsters or 16gr Seneca domes for high power. YO!
 
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Nice gun and Good deal BTW they just lowered the prices on the HW100s and HW110s and unfortunately I paid the higher price for mine but I guess that's how it goes could have been worse like my Pulsar then the price was drastically reduced. I liked my 177 so much I bought another just like it in 22 on its way now and it's gonna be on the weak side at only 20fpe. YO!
 
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First off, congrats on your new Weihrauch! I believe you will really love and enjoy it as most Weihrauch owners do! I think many people start making adjustments to their guns before they actually take them out and run them through their paces. Does it really matter at what FPS the gun shoots at, what regulator pressure, hammer spring tension, etc.? If it shoots well, as the HW 100 does, why mess with it? Weihrauch is one of the oldest airgun builders and historically have produced much of their parts, barrels, etc., in house. They spend a lot of time getting their guns designed well and hence, have not tinkered with a good thing. If you poke around at most of the reviews, esp. those out of Europe, you will most likely find the HW 100 is widely regarded as a target and pesting rifle of choice for many. The gun is relatively simple, devoid of bells and whistles. Just air it up, load up the magazine and shoot pellet on pellet. Now if you are wanting to shoot at longer distances of 50-60 yards, then its inherent lower power starts to show up. But if you are shooting inside those distances, I believe there are few air rifles that can truly rival its accuracy. I have an HW 100 in 22 with the 16.1 inch barrel, thumbhole laminate. It has been flawless from day one. It is quiet, can get 5 14 round magazines worth of good shots out the 175cc cylinder before I have to make some POA adjustments. The trigger came set at 10 ounces, which is perfect for me. So, if you want a perfectly boring amazing to shoot air rifle, try it out, see what it does, if it doesn't do as well as you believe it should then tinker with it. There are some good vids online from England that will help you out. At appears that with the .177 the threshold of being too hot is right around 1000 FPS, beyond that the pellet can become unstable but somehow still hit its mark. Ted's Holdover had a really good Video on the Weihrauch along with a follow up video of it as well after a regulator adjustment. My .22 is not esp. pellet fussy except for my desire to regularly shoot hole in hole or no more than 1/4 inch groups at 26 yards or 3/8 inch at 50 yards (indoors). For that kind of shooting I prefer the JSB 18.1. Have great fun with your HW 100! 
 
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I only had it for a few hours yesterday, so I only have initial impressions and a few thoughts.

1. Trigger is awesome. Don’t think I’m going to need to mess with it.

2. Love the magazines. Easy to load and 14 rounds.

3. Wind was howling yesterday in ne Ohio, so I can’t say much about the accuracy. At 15 yards, most pellets were a ragged hole. At 35 yards, the heavier pellets grouped much better than the 8.44 as you would expect. Not sure if they’re better in the wind or if the light pellets were just going way too fast....probably a bit of both.

4. I was lucky enough to get it when they went on sale from AoA for about a grand, including free shipping. 

5. I seemed to get just less than 40 shots. Mine is the full length version, not the carbine, so it has the larger air cylinder. I hope turning down the reg and HS yields more shots....56 would be great.

Woke up to cold, snow and more howling winds. Other than a few honey-do items and coloring Easter eggs with the kids, I’m hoping to tear into this thing and try adjusting the reg and HS.
 
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My 22 full length standard came out hot also, easy gun to adjust, and get a lot more shots. My hw100 bp came out of the box way low? Totally agree with shooting her in a bit, they do settle a bit, our German friends that build those beautiful guns love grease and it may settle down a bit? But I personally would not keep it that hot, that is way too hot for me and your shot count would go way up! Both my hw100 love 830-880. If your speeds are correct? I would be shocked if your not spiraling? That adjustment takes less than 3 min to do, hammer spring nut adj, counterclockwise =lower velocity. Highly discourage messing with the reg! You won’t need too. Cheers
 
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HW100's are an overlooked gem. They are beautifully designed, built like a tank, and utterly reliable. If you watch the excellent videos on Youtube you'll see that regulator adjustments and hammer spring adjustments aren't that challenging if you take your time. Don't go overboard with the reg adjustments. Each 1/8th of a turn in either direction will change the regulator pressure by 20 bar. Based upon the velocity you're getting if it was mine I'd turn the reg down a little and lower the hammer spring tension until I was getting 910 fps with 10.35s and 980 fps with 8.44s.

The only modification I've done is to purchase an A&M aluminum cylinder for my HW100 .177 carbine. It doubled the shot count and lowered the weight of the rifle by a pound. The factory carbine cylinder is made of steel and only holds 105cc of air for about 30 shots. The longer A&M cylinder has double the air capacity and and omits the check valve assembly of the factory cylinder. The only downside is that A&M is in England and won't export to the U.S. market and their cylinder cannot be removed with air inside like the factory cylinder. I don't find it to be an issue since I only fill mine using the fill probe anyway. Ebay has other larger, lighter aluminum replacement cylinders for sale. I would advise anyone considering one to buy a complete cylinder, not just an aluminum air tube. Weihrauch air cylinders are nearly impossible to take apart to remove check valve end or the fill probe end without specialized tools. The end caps look like they should come off with a metric wrench but they won't without specialized tools to fit them exactly.
 
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You need to shoot it for a while at least 1000+ rounds before considering tinkering. I have a UK spec sub 12fpe HW110k and it shot mediocre in the beginning like an inch at 50 yards then got better with enough shots thru it and still improving. It gets 120-130 shots on a 2900psi fill and it's ridiculously quiet like my 20fpe 177 Marauder with a BIG Neil Clague attached. I liked the first 110k a lot other than the weight and bought the same k version in FAC 177 too from AoA but that one only gets around 40 shots and the silencer does not screw off. It looks like it's made of plastic or some kind of ballistic material but was surprised how heavy they are considering. I think PA may be selling them without the baffles since I read several complaints about how loud they are and that goes with other brands of PCPs they sell from what feedback I have read but I need quiet so I chose AoA. The 12fpe was from Krale since AoA wouldn't special order one even if I paid them up front and same goes for a sub 12fpe HW100 bullpup but Krale only has the LONG version. Anyone know a UK based USA friendly dealer? I would really like a 12fpe 177 HW100k bullpup. Probably get 70-80 shots which is more than double the 30-40 shots for now unbroken in with the FAC I have which is ok for its size and power. The triggers on both the 100 and 110 are excellent right out of the box. I like the lower fill pressures too. YO!
 
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I have had a couple Hw100' s one in 22 cal in a carbine I tuned ,I bought the best fittings adaptor for setting the reg from 90 bar to 130 bar through the years (10) I tried different tunes.

When I got my second Hw100 in 177 fsb configuration ,it was not quite as hot as yours.If I recall it was around 1025 -,1050 fps with 8.44 gr as an example.

All I did on this one ,is turn the hammer adjust out 2 turns,no reg adjust,it sends 10.3 jsb at 870 fps,groups well and enough shot count for ft.

Hav'nt made a change in 4 years !,kelly
 
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True HW bliss this morning.....I did some tinkering because I didn’t like how hot it was shooting, resulting in too few shots per fill and the not backyard friendly crack when the round went off. Making the adjustments was so simple and if it settles in over the next 1000 rounds or so, it will be easy to tweak it to where I want it.

So here’s where it’s at right now:

Reg turned 1/4 ccw, resulting in 110 bar set point.

Hammer spring turned 1-1/8 ccw.

With these settings, velocities are:

JSB 13.43 was 910 FPS, now 815 fps

H&N 10.65 was 995 FPS, now 910 fps

JSB 8.44 was 1075 FPS, now 1000 FPS

I am also getting 60+ shots on the reg, up from 40. The loud crack is now Marauder quiet.

What a difference how this thing is made compared to a couple Hatsan rifles I’ve owned. Someone said like a tank....that’s a pretty good description. And ooh that sweet side lever. 

30’s with 20 mph winds today, so I probably am not going to get to check accuracy. Hopefully tomorrow.

Thanks for everyone’s advice. I think this is going to be a great pcp to own.
 
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True HW bliss this morning.....I did some tinkering because I didn’t like how hot it was shooting, resulting in too few shots per fill and the not backyard friendly crack when the round went off. Making the adjustments was so simple and if it settles in over the next 1000 rounds or so, it will be easy to tweak it to where I want it.

So here’s where it’s at right now:

Reg turned 1/4 ccw, resulting in 110 bar set point.

Hammer spring turned 1-1/8 ccw.

With these settings, velocities are:

JSB 13.43 was 910 FPS, now 815 fps

H&N 10.65 was 995 FPS, now 910 fps

JSB 8.44 was 1075 FPS, now 1000 FPS

I am also getting 60+ shots on the reg, up from 40. The loud crack is now Marauder quiet.

What a difference how this thing is made compared to a couple Hatsan rifles I’ve owned. Someone said like a tank....that’s a pretty good description. And ooh that sweet side lever. 

30’s with 20 mph winds today, so I probably am not going to get to check accuracy. Hopefully tomorrow.

Thanks for everyone’s advice. I think this is going to be a great pcp to own.
Click to expand...

I dialed mine back as well - that's about where my .177 HW100 is shooting and I am very happy with it.

Beautiful rifles the HW100 - liked the .177 so much I bought a .22 to go with it.

Enjoy!!
 
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Just a bit of feedback on the HW100. Went to clean the barrel and unscrewed the moderator. I assume it’s attached to the barrel with 1/2-20 threads and maybe Loctited. I didn’t want to force it because it does a good job and I don’t need to replace it. I did remove the shroud and here’s what it looks like....

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So after a good barrel cleaning with Ballistol, I took it out to test accuracy. I have about 300 rounds through the barrel before these shots. I wasn’t expecting much from some of the cheaper pellets, but got them to help tune and break in the barrel rather than using the expensive ones.

The target is 28 yards and swirling 10 mph winds. Each group is a full, 14 shot magazine.

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This is my first .177, so this is all the pellets I got in my initial buy to try. I do have some JSB 10.3 and some air arms 10.3 on order. So far, it looks like it’s going to like heavier pellets. I was surprised how well the super cheap Daisy pellets grouped, other than one crazy flier.

I wouldn’t consider this acceptable accuracy, but I’m not going to worry about it too much until I get at least 1000 rounds through it. Is their a pellet your HW100 prefers most, or a specific weight it likes?


 
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Dreamweaver, you can easily fix the problem of the moderator end cap that is still attached to your barrel. Take a heat gun or small blow torch and heat up the moderator end cap. It will melt the locktite and it will break loose. Use pliers with a piece of leather to protect the cap from gouges when you break it free. Clean the locktite from the barrel threads and locktite the end cap to the moderator body. Then you can detach it as a unit as it was designed to function. 
 
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My .177 HW100 likes both the 8.44 and 10.43 JSB pellets; I usually shoot the 8.44s because my other .177 rifles prefer them. 

From a rest, a 25 yard, a 10 shot group typically results in one hole about 3/8" in diameter.

I do most of my pesting/hunting with my .22 HW100 FSB and it is accurate enough that head-shots on grackles at 30ish yards and body-shots out to 50 or so yards is never a problem.

Both my HW100s are very consistent with an ES of 6-8 fps.

I have quite a few nice airguns, the HW100s are my favorites - excellent rifles ...but since you have one, you know that! 
 
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