CZ 527 .223 conversion to .300 whisper

[blackwinch]

I was recently introduced to the 300 Whiper and am interested in converting my CZ 527. Does anyone have any good advice for me?
I've contacted SSK I was just looking for more feedback, help selecting a suppressor, barrel length etc.

[Artful]

Originally Posted by blackwinch

I was recently introduced to the 300 Whiper and am interested in converting my CZ 527. Does anyone have any good advice for me?
I've contacted SSK I was just looking for more feedback, help selecting a suppressor, barrel length etc.

Places to start your research
http://www.sskindustries.com/ home of 300 whisper creator barrels & cans
http://www.silencertests.com/ suppressor reviews
http://www.atf.gov/ - your gov't reg's
http://www.srtarms.com/ - Doug has done custom barrel's w/ suppressors
http://www.ar15barrels.com/prod/300-221.shtml - Randell's custom barrels
http://www.corbon.com/ - 300 whisper factory ammo

Free Advice ! Need some answers from you first !
Decide upon how you want to use the gun, is weight important?, Do you see a need to shoot without the suppressor? Do you want the suppressor to appear as add-on to end of the barrel or be part of the gun and just look like a heavy barreled rifle? are terminal ballestic's important (ie hunting loads) or just punching paper and steel? you going to shoot close range only (out to 150-200 yards) or try for targets way out there (200+ yds)? going to do the SBR paperwork and $200 tax or have 16" or longer barrel? - keep orginial stock or go with a different one?

;)

[blackwinch]

Sorry I haven't had the chance to reply but, thanks for all the links for potential info.
I never really gave much thought to the SBR, but nice one none the less...
My line of thinking is to have SSK re-barrel the little rifle with a 16" Shilen 1/8, and thread it.
I was thinking along the line of a Gemtech or an AAC but he, JDJ, mentioned that he too can provide me with a suppressor. As this is my first venture down this road I'm a bit confused how to go. I'm not too familiar with JDJ's silencers but, knowing of his reputation the product must be good and the other products stand on their own.
I don't see this rifle as being used only for paper punching, and I do know the limitations of this cartridge but, shots out to 200/250 are in the realm of possibility.
The rifle I shot that got my interest was a Thompson Contender G2 since then I started searching for a small bolt gun that I thought would work well for the project. When I found this hardly shot, in box CZ. So the purchase was made and the project planning began.
I want this to remain a compact piece, the original wood is nothing special but, does have some nice figure to it. I would consider a new compact stock but, the choices are limited. I know HS precision makes a synthetic varmint stock, and Boyd's makes a nice looking laminated stock. Beyond that the choices are limited.

[d-mon]

Hello Blacksmith,
Converting the little CZ is one of the most common transformation being done in france.
Take a look at the following link to see what can be done:
http://www.stopsontfm.com/ look for micro-anthis

Usualy, the CZ action needs to have its face trued up so that the shoulder of the barrel can rest on it (the factory usual mount is " a la Mauser" with the back of the barrel resting on an internal shoulder behind the threads, which is not the best for perfect alignement and concentricity).

Good luck with your project.

ND

[blackwinch]

I kind of wish you didn't tell me they were doing it in France. Australia, New Zealand, Italy but, France. It sure looks cute though. I'm leaning toward having JDJ/ SSK do the whole job and.

[blackwinch]

I did see that link in my research. I think I'm going to stick with JDJ/SSK to have the work done.

[d-mon]

That is the wisest decision, as exporting firearms (legaly of course) out of usa becomes a nightmare. Sometimes, some peoples forget that France and UK are part of NATO as well.
Good luck with your project.

ND

[Scoop]

Take a look at the one I just had done. I sent the barreled action off to PacNor for a rebarrel in .300 Whisper. I went with their 1:6.5 twist SS Supermatch barrel. To say I'm pleased would be an understatement. Haven't really put much time in on load development either, but the 220gr SMK on top of 10.6 grains of Reloader7 is giving me 1020fps and sub MOA groups. Hard to argue with that. I'm gonna play with some H4227 next week. I had SSK build my first Whisper (a TC Contender) and it was a good shooter, but I'm happier with this one from PacNor. The second picture is of the modification that must be done to the mag to allow those fat .30 cal bullets to fit in a .22 cal space (the bullets pictured are 220 gr Sierra Pro-Hunters). I had my local machinist modify the mags. Very simple to do. He just chucked it up in the end-mill and milled out the dimple. I had him only machine down so far so that the relief-cut doesn't show below the line of the weapon when the mag is in place. That dropped the mag capacity to four instead of five. No big deal.

[d-mon]

Very pretty.
But a twist of 1 in 6.5" seems very fast for these bullet. I thought the norm was 1 in 8"?
ND

[Scoop]

My 8-twist SSK Contender barrel did a pretty good job with the 220 SMK's. I never tried the 240 SMk's in it. It just seems to me that you can't over-stabilize a subsonic projectile, so I went with the 6.5 twist. Also decided not to deal with JD again, so I gave PacNor a shot (they've done an excellent job on other rifles for me) at the whisper. I am certaily pleased with the outcome. By the way, this 6.5 twist barrel also shoots 125 grain Sierra ProHunters (at ~2000 fps) into itty-bitty little groups.