Navigation Menu
Search

 

HW 90 by Weihrauch

From AirgunArena

Jump to: navigation, search


  • Currently 5.00/5

Rating: 5.0/5 (4 votes cast)

Review this product
26 March 2009  

Author Rysz
Things I liked: The HW90 is a single shot, break barrel, self contained gas spring airgun made by Weihrauch of Germany in cooperation with Theoben of the UK. It is a heavy airgun at over 11lbs with a scope, silencer fitted. Beeman of USA also made one as RX1 and RX2. The safety is resetable. At 26bar the airgun is tough to reload each time. You can also get a carbine model HW90K. If you buy one, and intend to maintain it yourself, buy some piston and breach seals. The rest can pretty much be sourced.Theoben sell pumps so do Hills, but get a pump with a dial otherwise changing the pressure may be hit and miss. There are many DIY pictures out there of how to disassemble one. I own a HW90, 0.22cal (5.5mm). I adjust my own pressure. Mine is pumped up to 26bar with a shock pump made by Scott Pro. The pressure gauge on it (0-40bar) has been calibrated with my own reference pressure gauge. I found the pump pressure gauge to be reading 1bar low over the pressure range. I've also tried the HW90 at 12,15,20,22,26bar. It does not fire at all at 5-7bar. I keep the airgun at 26bar because thats how this theoben gas spring is specified (over 20 ft-lbs energy).
Things I would have changed: Scope mount: I use sports match AO mount (4 allen key bolts, similar to Beeman 5039). Setting it up properly is crucial, otherwise you may run out of windage and elevation on the scope. If I could, I would try a BKL260 mount (6 allen key bolts) with 4 to 7/1000" droop, to compare. But they are not available worldwide. Scope:I use Leupold scopes like the EFR types. So I don't need a dampa mount. Moderator:I have fitted a Weihrauch silencer, because I feel the HW90 at full power is noisey. Straightshooters have a RX1 0.20cal as 69dB at 50yards. I'd expect more for a 0.22. To fit the silencer, it fits straight over the front sights. No cutting off of the barrell required. I made a neoprene tube made from a dive suit, to fit over the silencer to stop it getting scratched. Sling:There is no decent way to attach a sling without dmaging the bluing. You must have a sling as it is heavy. To fit the sling at the receiver end, I had to drill a 2-3mm hole into the cocking arm (all other solutions were budget). I then threaded stainless steel tackle( used to catch big game fish), multiple times into small loops through the hole while also threading into PVC tube at the same time.The PVC tube stops the wire from ripping into my leather sling loop). Schrader Valve: When you undo the blanking screw from the end of the air fill port you will could hear a escaping air sound. That comes from a leaking schrader valve. You should find it to be a pink/red coded type. I believe that this valve is not correctly rated for the rifle at 26bar (377psi). You need to replace this valve with a higher rated valve (white coded) as fitted to aircraft tires (they are rated at over 400psi). Vibration: At 26bar every screw and nut vibrates free. You must loctite them all (silencer grubs, scope mounts, HW90 nuts,use loctite 342 or better).
What others should know: Shooting Position:At 26bar, it is a tough rifle to master. But most of the problems of inaccuracy come from shooting position. Look at a You Tube video called "FT shooting positions". Excellent video. None of this elbows on knees stuff. Accuracy is particularly important with rabbits (40-50m) and you need to get that head shot ,otherwise they will go into the burrows. And perhaps die there needlessly. Seeing the video changed my mind about the HW90. Reliability: There are lots of stories out there about the unreliability of the HW90. Alot of it I believe is mistreatment. Anything from filling the rifle with Oxygen, to allowing it to rust, to contaminating the receiver with soil and dirt. Mine has been shot over 3000 times in less than one year. Don't dry fire it, or let the receiver go while cocking it until it clicks, and you will be doing all you can to give it the best chance of survival. Pellets:I use JSB/Wolverines/Air Arms in the 16gr to 14.3gr (jumbo express) range, all domed and the results are consistant. Typically, 2 inch groups is a good outcome at 50meters. A rabbits head diameter.That's full power of over 20 ft-lbs not 12. In essence though, getting the flattest trajectory out of a pellet without the associated instability caused from bad aerodynamics and high speed is what the goal of pellet selection is all about. About pellets grains for this gun. I asked Charlie de Tuna in the USA about heavier or lighter pellets, and he seems to think that its best to stick to the mid range pellets. Up to 18gr. So the Barracuda of 21gr is not favoured.Schrader Valve: When you undo the blanking screw from the end of the air fill port you will could hear a escaping air sound. That comes from a leaking schrader valve. You should find it to be a pink/red coded type. I believe that this valve is not correctly rated for the rifle at 26bar (377psi). You need to replace this valve with a higher rated valve (white coded) as fitted to aircraft tires (they are rated at over 400psi). I did this and have had no more air escaping. You won't read this claim about the valve anywhere else on the internet. But thats what I've found. In essence though, getting the flattest trajectory out of a pellet without the associated instability caused from bad aerodynamics and high speed is what the goal of pellet selection is all about. Rust: You must wipe the metal with good gun oil. Regularly.The bluing can deteriorate even if you look after it. A good wipe down is a good routine to get into. >> LASTLY have a look at this webb site about Hunting THEOBENS in 0.22cal http://www.velocitypress.com/air_rifle_ballistics.shtml
Overall rating:
Value for money:

26 March 2009  

Author Rysz
Things I liked: Powerful. No need to repump as air pressure is conserved in the chamber. Try JSB 0.22 (5.5) FIELD 16grain for long distance. 50m hunting consistency of less than 2inches is achievable and able to bring down a rabbit. I bought my own pump and accessories. The safety can be reset when you decide not to fire.
Things I would have changed: It can be costly to fix/replace and parts hard to track down. You have to have a head for pressures up to 377psi (26bar) if you want to fix it yourself. Recoil is big. It scares birds and rabbits so a Weihrauch silencer is a must (does not require removal of the front sight). The fill port thread is not standard probably DIN. Buy a spare fill port cover screw and thread it on the other side to M3,4,or 5? to make your own hose connector to connect to schrader thread on a mountain bike suspension pump like "Scott shock pump pro 600"( is to 40bar). Cocking is tough at 26bar but you can reduce the pressure. Rusting will occur if you don't oil it.
What others should know: Don't recharge the gas ram with anything except air. Use pure Oxygen and you will die. Don't use pellets over 18grains. Light pellets also not good as they become unstable. Barracuda (kodiaks) 21 grains pellets are probably too heavy as its the piston seal that will be punished time and time again. BKL260 1 pce mounts seem to be a good mount. You can get droop types in this mount . Scopes need to be good quality otherwise its hit and miss. You never see Leupold 3x9-33 EFR (58710) in any bad review blogs. I went for the best I could afford. Expensive scopes are also easy to sell if you bought at a good price. When breaking the barrel do not let the barrel go until you have heard the cocking sound. letting go without proper cocking causes piston slam into the breech which can cause gas ram failure. (buy spare piston seals, all other orings are cheap). Same with dry firing without pellet, don't do it.I went to gas rams because springs are too primitive and tuning them keeps all the air rifle shops in business. You can change the air pressure to whatever you want.With exacts 16grains: 187m/s is 17J, 202m/s is 21J (15bar), 265m/s is 36J (26bar). Gets to page 330 in phone book from 45meters using 18grains. May not penetrate animal at 100m but will knockout.Watch out for barrels with excessive droop.
Overall rating:
Value for money:
Accuracy:

4 October 2007  

Things I liked: accuracy---no recoil
Things I would have changed: lower the compression in the chamber
What others should know: very difficult to load.you can break out into a sweat after some shots
Overall rating:
Value for money:
Accuracy:

8 September 2007  

Things I liked: It's a beautifully made rifle right out of the box, and you can stay with the sights it comes with, especially with the .177 version - see below.
Things I would have changed: This thing has almost too much power. It's hard to cock, so don't think this is an airgun you'll shoot all day without breaking a sweat. For this much power, a muzzle brake would be good. Using different pellets, they generally hit in tight enough groups, but those groups can be as much as 8 inches apart at 20 yards.
What others should know: Use heavy pellets! - such as the Crosman Premier domed pellets, 10.5 grain - these tend to be the most accurate. Don't use pointed pellets (my RWS Superpoints go all over the place, they're just too fast).
Overall rating:
Value for money:
Accuracy:

(first | last) View (previous 5) (next 5) (20 | 50 | 100 | 250 | 500)