Hausken

[Sonicdmb73]

I do agree that the hole (through the moderator) does need to be larger than the passing bullet but the larger the hole the more expanding gas passes through and the 'louder' it is. Mods with the tightest bore to calibre tolerance offer greater sound suppression. A total of 0.3/0.4mm radial clearance is OK, adding another 0.4mm would make the modferator 'much' louder.

Bullets "wobble" do they @ejg ? Perhaps you could explain that ?

There’s definitely a marked difference in volume when you use a moderator with a larger hole size.
Zeroing rifles earlier this week with a mate.
Both CZ550’s in 243 both fitted with PES moderators. However his was for 243 Mine a 30 calibre one.
Using the same ammunition from the same firing point etc. His was a good bit quieter.

 

[ejg]

I do agree that the hole (through the moderator) does need to be larger than the passing bullet but the larger the hole the more expanding gas passes through and the 'louder' it is. Mods with the tightest bore to calibre tolerance offer greater sound suppression. A total of 0.3/0.4mm radial clearance is OK, adding another 0.4mm would make the modferator 'much' louder.

Bullets "wobble" do they @ejg ? Perhaps you could explain that ?

Try figure it out your self.
edi

 

[jubnut]

No you don't reduce efficiency dramatically, very slightly maybe. In my case increasing bore size by 0.3-0.4mm made the moderator useful. No matter what, rifle manufacturers will manufacture threads on the end of barrels... these threads will have slight tolerances and moderator manufacturers must live with it... others do but Hausken has a reputation for having too small holes in the baffles for cal. The holes in a moderator must be bigger than the bullet wobbling through.... I hope we all agree.
Way more "efficiency" is achieved by a bit of wire mesh inside the moderator compared to a few tenths of a mm in bore diameter.
edi

I agree however I'd rather use one that hurts my ears less!

Fair enough but that's kind of down to situation isn't it? shooting with a tree or trees in front of you as opposed to open ground?

 

[1894]

Agree but they were 'tested' together in the same place.
I really don't mind if people think otherwise, I can only report that after 10 years of jetz usage I found something quieter to my ears, that this has been verified by 3 others on 2 seperate rifles and that I still often use a jetz because it is so sturdy and maintenance free as well as giving the muzzle forward balance I like.

When I hunt moose I often can't use ear muffs and so really appreciate the extra performance of the Hausken.

 

[Miki]

Try figure it out your self.

That maks no sense whatsoever ... try to figure what out ?

 

[ejg]

That maks no sense whatsoever ... try to figure what out ?

You asked me a question and I said try figure it out your self. What don't you understand?
edi

 

[Miki]

You asked me a question and I said try figure it out your self. What don't you understand?
edi

I asked this question ....

Bullets "wobble" do they @ejg ? Perhaps you could explain that ?

primarily because I can't "work it out", it was your statement not mine and I am giving you the oppertunity to share your wisdom with the rest of us

I can define a 'wobble' for you (at least my understanding of) as being a axial and/or logitudinal variation caused by an imbalance or other force acting upon the object (in this case the bullet). Your statement implied that bullets "wobble" as they pass through a moderator which is why the bore needs to be "large" relative to the diameter of the bullet and you stated (in two posts) that "Hausken has a reputation for having too small holes in the baffles for cal" (quote @ejg ) and that bullets "wobble" through. You further stated that having a tighter to cal bore in the moderator did not "reduce efficiency dramatically, very slightly maybe"
Which I disagree with but hoped you would be providing a logical explanation to, so filling in a gap in my understanding and providing a clear and education response to the OP's original question.

 

[ejg]

Miki,
there are so many reasons why one should have the bore in the moderator larger than the bullet. The larger hole will cater for tolerances in imperfections across the board. No Moderator is made 100% straight, no shoulder of the moderator is 100% perpendicular to the bore. Same is for rifle barrel threading. One must allow for a certain amount of tolerance. Bullets are not 100% balanced and "wobble". The hot gasses passing the bullet upon exit might be slightly favouring one side due to the crown being off somewhat giving the bullet a slight kick to one side. Then you have a system that is in motion. Rifle barrel is being thrown backwards and mostly rotating around it's COG while the bullet is exiting. Launch angle is changing due to muzzle flip. Of course the moderator and it's connection is not of unlimited stiffness and will flex somewhat under load.
All these things can lead to baffle strike or in some way effect grouping. One can not really say how much larger a hole in a moderator should be over bullet diameter but we know the smaller the hole the more problems one will run into. Some moderator companies run with a 1mm rule, hole in mod 1mm over bullet diameter. 308 being ~7.8mm means 8.8mm hole in mod. as a min.
It is not about one single case that might have shot a good group with a tight bored mod one needs to look at larger quantities. One only needs to follow threads in forums how often a mod is responsible for bad grouping.

edi

 

[Jelen]

Well on my 308 shot blind in front of 2 people who did not know which moderator was being used the JD 224 xtrm was markedly quieter to the bystanders ear. Same between jet z and JD184 XTRM on a 30-06 though less of a difference.
This mirrors other tests I've seen.
You can't spray an XTRM - it's filled with wire wool.
I have no axe to grind - I shoot jetz and Hausken

Can you replace the wire wool when it eventually gets clogged up with soot and gunk?

 

[Border]

Can you replace the wire wool when it eventually gets clogged up with soot and gunk?

You can wash it and refit.

 

[Scooby-3]

Got Hausken MD45's on my 223 and 243 and not had any issues.

Have you still got the mod? How has it lasted and how quiet is it on your 243?

 

[Ratsbadboy]

Have you still got the mod? How has it lasted and how quiet is it on your 243?

No. I sold it when I sold my Savage .243 Accustalker. I replaced the gun with a .243 Tikka Super Varmint which originally had a ASE SL5i mod on it which was OK, but I wanted something quieter. I now use an ASE SL7i which is noticeably quieter than both the Hausken and the SL5i. I still shoot with the chap that bought my old Savage and he's perfectly happy with the MD45, but compared to the SL7i it is loud.

 

[Scooby-3]

No. I sold it when I sold my Savage .243 Accustalker. I replaced the gun with a .243 Tikka Super Varmint which originally had a ASE SL5i mod on it which was OK, but I wanted something quieter. I now use an ASE SL7i which is noticeably quieter than both the Hausken and the SL5i. I still shoot with the chap that bought my old Savage and he's perfectly happy with the MD45, but compared to the SL7i it is loud.

How would you compare the md45 to the sl5?

 

[Ratsbadboy]

How would you compare the md45 to the sl5?

Noise wise I would say they're similar. Obviously as I haven't got the MD45 now so I can't compare, but I would say the SL5i is heavier. It's a zero maintenance stainless steel jobbie whereas the Hausken is aluminium, and I noticed if I didn't spray some WD40 in after each use it would leave traces of white dust where it was stored on end in the gun cabinet. That could only be aluminium oxide from where the inside was starting to corrode. I don't get anything under either of the ASE's. To be fair, I was perfectly happy with the MD45 on my Savage and I was perfectly happy with the ASE SL5i on the Tikka, but I also have a Tikka .308 with the same barrel thread and that definitely needs the SL7i. so the SL5i is redundant now.

 

[Scooby-3]

I’m thinking of a MD35 for a low profile mod on a gun using thermal scope.

I have sl5’s I think they are brilliant little mods but can see the mod through the scope, hoping the lower profile 35 I won’t

 

[Ratsbadboy]

If you can see the SL5i you're going to see the MD45 - from memory they're both roughly the same diameter. Depends a lot on the minimum mag of the scope of course. I realise you won't get the same problem, but my mate has a Alpex 4K on the Savage and it's been a nightmare trying to get rid of the ir torch lighting up the back of the MD45. I have another friend who has a Pard DS35-70 on top his Tikka T3x and he's had no end of trouble with the MD45 effecting the rangefinder of the Pard.