Newbie to this forum - say it quietly!

[AndyUK]

Hi all,

Just joined the forum, as I am interested in building a suppressed .300 Whisper on an AR15. Suppressers / moderators are legal (encouraged, even!!) in the UK. Centre-fire semi-autos are totally illegal, and have been for twenty years. Therefore, I'm considering a manually operated carbine. Any suggestions for optimum barrel length and twist with 220 - 250g bullets at sub-sonic velocity would be greatly appreciated!

AndyUK

[ranger dave]

i would buld a nice rem 700 with a 16inch tube with a 1 1n 8 twist to bad you guys cant have semi autos

[AndyUK]

Thanks, Ranger Dave

A friend of mine has a leftie 700 in .243 for Roe and other small deer. The 700 is very popular over here as a basis for both target and deer shooting rifles.

However, if I was going to use a bolt action in .300 Whisper, I'd probably consider the CZ527 action - it's available in Fireball and other small .22 centrefires and I like the detachable magazine option. Of course, it can be done with the 700 but it's more complicated .... and expensive!

Despite centre-fire autos being illegal (we might start a revolution or something) the AR15 in manually operated format is still very popular with the Practical Rifle lads and is also gaining a specialist following for fox shooting, as we cannot now legally hunt foxes on horseback. (End of rant, snarl, grrrr!)

[d-mon]

Hello Andy,
Welcome to the forum.
If you chose to go with the cz action, make sure you choose a 222 or 223 as a base instead of a 221 fireball. I am not sure, but there are different magazines lenght for each cartridge, and if you go with a 221 fireball, you might not have enough length to seat your matchking fare out enough.

I went with a 222 cz fox myself.

I higly recommend Border barrel if you are looking for a good tube in the uk with a 1in 8" twist.
Norman Clark might have a reamer.

AR-15 base should work quite well also, + you won't have all the trouble of the gaz port as most of the members of this forum, as you are going manualy operated.

ND

[AndyUK]

D mon,

Appreciated your comments on 527 mag length! I must admit, I'd completely forgotten. Interesting about the magazines, I thought that they just blocked them for the shorter cases. But then I remembered looking at a .223 and I think that the mag was marked .222/.223 so, the Hornet and Fireball must have there own dedicated magazines.

I hear good things about Border Barrels. I used to know a semi-professional stalker who was very keen on their barrels - I think that he'd had a 6.5 Swedish re-barrelled by them and was very satisfied. 1 in 8 does seem the way to go - I'll be using 220 - 240g projectiles. Still got to decide on which moderator to use.

I DO ilke the look of the AR15 though. So I'll start by pricing up that option. Yep, not having to worry about the gas port is the one 'advantage' of the semi-auto ban!

Rgds

Andrew

[d-mon]

Hello Andy,

Regarding the can, I do not think that the reflex type of supressor is best suited for your projetc. That can is definitly very good for supersonic calibers.Peter Jackson import them as well as the BR reflex, maybe his opinion might be different and better?

However I think that the Jet Ultra is the way to go (I hope I have the name right here). They fit at the end of your barrel and extend further past the muzzle than a Reflex, and are much more efficient for subsonics. And you can go with a barrel as short as 12" if lenght is a problem.

One thing to remember, It is not always easy to reach the 1700f-lbs of energy required by the law in UK with that cartridge.

ND

[AndyUK]

Funny enough I was looking at one of the Jackson adverts earlier today, and reading an article about the PES from New Zealand.

I'd been led to believe that the two-point reflex-style mods were generally, better although I have to say that my good 'ol Parker-Hale works superbly on my .22 rifles.

Although I'm principally interested in sub-sonic usage, it might be a laugh to get the .300 Whisper generating 1700ft.lbs. I think the hottest that I've seen is about 2400 fps with a 125g bullet - not quite enough, this side of Hadrian's Wall! I'll talk to the Jackson chappie, I'm sure he'll be able to proffer good advice on the optimum route to achieve maximum attenuation.

[d-mon]

Hello Adrian,
I am now based in New Zealand, and with time, will probably become more familiar with the PES models.
The only advantage of the two point mounting system, is that it is more confortable to carry a rifle in the field, specialy if you have a long barrel. It may also help to reduce the vibration on certain barrels and help accuracy.
But a silencer (properly) mounted at the end of a barrel has the same vibration damper role and is at leat as efficient in supersonic, and I think more efficient in subsonic, specialy with larger diameter bullets like the .429 or .458.

Good luck.

ND

[ranger dave]

cz are one of my favorite guns but you have to mill the mags to fit the 300 whisper to work they have a large detent on each side of the mag good luck

[Scoop]

Originally Posted by ranger dave

cz are one of my favorite guns but you have to mill the mags to fit the 300 whisper to work they have a large detent on each side of the mag good luck

Here's a picture of a modified CZ527 mag (originally a .223). Very simple to do. Just chuck it up in the end-mill (gently) and mill out the dimple. I only went down part of the way so that the relief cuts don't show when the mag is seated. Reduced capacity to 4 rounds instead of 5.