Cz-527

[melensdad]

Its my understanding that the magazine lips are different. Perhaps the baseplate too?

Honestly I'm waiting for mine to be delivered, so I have no clue, I'm just going by what I was told. Until I get rifle and parts in hand I won't know for sure.

[mtn_shooter]

I don't mean function (to an extent, I guess), just that it will physically fit.

If I get a .223 rifle then decide to open the bolt face and modify the extractor and put a 6.5 G barrel on it, can I just use 7.62x39mm mags in the same rifle.

[melensdad]

I don't mean function (to an extent, I guess), just that it will physically fit.

If I get a .223 rifle then decide to open the bolt face and modify the extractor and put a 6.5 G barrel on it, can I just use 7.62x39mm mags in the same rifle.

I would bet you could simply buy a 7.62x39 bolt, rather than opening the face of the 223 bolt. It is my understanding the magazines are interchangeable but the feed lips are different.

[LRRPF52]

There is no reason to get a .223 unless it's a good deal from a F2F sale, and then you need to cost-benefit weigh the custom work for a Grendel conversion. I would go with a 7.62x39 CZ 527 and pull the barrel, then drop-in the Grendel barrel after blueprinting the receiver.

[melensdad]

There is no reason to get a .223 unless it's a good deal from a F2F sale, and then you need to cost-benefit weigh the custom work for a Grendel conversion. I would go with a 7.62x39 CZ 527 and pull the barrel, then drop-in the Grendel barrel after blueprinting the receiver.

This is the same advice that I have been given by a trusted gunsmith and commercial wildcat developer. Starting with the 7.62x39 caliber CZ 527 makes for a very easy conversion to the 6.5 Grendel.

[BjornF16]

This is the same advice that I have been given by a trusted gunsmith and commercial wildcat developer. Starting with the 7.62x39 caliber CZ 527 makes for a very easy conversion to the 6.5 Grendel.

Easiest way...I'm doing the same with Savage 10 in 7.62x39...

[Hooz]

I have 527s in 7.62x39, .204 Ruger and .223 (now .300 Blackout) and all the magazines are different. The feedlips are slightly different on the 7.62x39 mags, but the big difference is that they have ridges pressed in to the sides of the mags. The ridges sit just in front of the shoulder of the cartridge to keep the rounds stacked nicely in the mag. Each magazine has slightly different ridges to accomodate the different rounds.

You can kind of see the differences in the mags in this picture:



Just to clarify, I had to mill the ridges out to use the .223 mags with 220gr 300 BLK subsonics, like this:



Hand cycling Grendel rounds through the 7.62 mags works perfectly. I can't imagine having to mod them much, if at all.

If you start with a 7.62 527, converting to 6.5 Grendel is as easy as a barrel swap. Now that my Blackout conversion is done, the Grendel conversion is next on my list.

[Nukes]

Any updates on any of these projects?

[Nukes]

Any new finds of lightweight synthetic stocks for the CZ 527?

[Drifter]

Any new finds of lightweight synthetic stocks for the CZ 527?

It might have already been mentioned, but it's possible that the M1 polymer stock and trigger guard (both available online from CZ-USA) might work okay with a converted CZ.


Also noticed that a CZ-527 converted to 6.5 Grendel is listed on gunbroker:

http://www.gunbroker.com/Auction/ViewIte...=348230968

(Not affiliated.)

[Nukes]

It might have already been mentioned, but it's possible that the M1 polymer stock and trigger guard (both available online from CZ-USA) might work okay with a converted CZ.


Also noticed that a CZ-527 converted to 6.5 Grendel is listed on gunbroker:

http://www.gunbroker.com/Auction/ViewIte...=348230968

(Not affiliated.)

The 527 American is mentioned, but not the Carbine: https://shop.cz-usa.com/P-19920/Stock-52...Stock.aspx

Also, in view of the ring height problems mentioned in this thread, a thumbwheel cheek piece would be a plus.

I am sure you noticed the starting bid of $2,500 on that gunbroker item. Twice the price that the CZ Custom Shop quoted me for their conversion.

[Drifter]

The 527 American is mentioned, but not the Carbine: https://shop.cz-usa.com/P-19920/Stock-52...Stock.aspx

I think the difference between the Carbine and American stocks is the trigger guard, which is why I mentioned that part too. But I could be mistaken...

I am sure you noticed the starting bid of $2,500 on that gunbroker item. Twice the price that the CZ Custom Shop quoted me for their conversion.

If the guy would sell it without the scope, price would likely be more reasonable.

[hm2 clark]

I know of only a few companies that make those synthetic stocks. (1) HS precision the 2000 (something). Probably your best bet. (2)Bell and Carlson; they make for CZ-and they wont sell to regular people, but who knows, maybe they have a extra laying around in storage... you could call.// The truth is really nada,sip nil.

[Nukes]

HS? No way they get even 1¢ of mine.

[Nukes]

Is anyone seeing ¼-½ moa out of their bolt (or falling block) Grendels?

If so, what did you have to do to the rifle to obtain such accuracy?

[Rainman]

I also noticed the CZ on Gunbroker and the seller was sure proud of it based on the price. I suspect he either still owns it or someone made a more reasonable offer and bought it after the last listing expired. The Brockman build adds value but the scope he selected wouldn't be on my short list for that rifle.

[stokesrj]

Is anyone seeing ¼-½ moa out of their bolt (or falling block) Grendels?

If so, what did you have to do to the rifle to obtain such accuracy?

Bolt guns are surely capable of this kind of accuracy but it isn't something you just slap some parts together and expect it to happen. First you need a quality barrel, there are plenty of them out there. The barrel needs to be turned on center to the desired profile, you would be amazed at how many barrels are turned slightly off center resulting in more metal on one side of the bore than the other. Then the barrel needs to be chambered in line with the bore, few do this to the extent needed but some do. Then the action needs to be true and square, many people are capable of doing this work with the right tooling, or you can just buy a true and square action to begin with, prices start at $1,000. Then the action and barrel need to be bedded in a way that provides a rigid interface with a large bearing surface between the stock and action while leaving the barrel free floated.

I've built one 6.5 Grendel that is capable of .25 MOA over a wide range of conditions and several that are capable of .5 MOA. The .25 MOA rig is a Stolle Panda Action with a Krieger barrel turned and chambered by Speedy Gonzalez (Bench Rest Hall of Fame) and set into a McMillan Anshutz Prone stock. It has a Timmney 2oz trigger and a Leupold 36 X bench rest scope. I've shot several groups with it that just make the hole get darker with each successive shot. And I've won a few matches with it.

I once put some pics up of it on the forum, but I believe it was before the great crash so here are a few pics to help you get the general idea.



And this is one of my winning targets, not from a bench, but fired prone, no support except a sling.

[Nukes]

Gorgeous! Thank you, Bob. That is indeed the accuracy potential I am seeking (a Christmas present for one of my sons). Until you mentioned it, I had not heard of the aluminum/steel Stolle action—hard to imagine that the CZ 527 micro action could compete. Are high scope rings necessary for bolt handle clearance? Since he is 7, the CZ is appealing for its weight. Do you know the weight of your fine rig?

The McMillan Edge-LV Ultralight stock looks like it might be lighter, but not a very versatile stock.

[stokesrj]

I don't think this type of rifle would be appropriate for a young person, as configured this rifle weighs around 17 lbs. I built another that was more appropriate for your purposes. I used a Remington Model 7 action, along with a bolt from Pacific Tool and Guage in the ppc bolt face and Sako extractor. A Remington Model 700 Short Action would be nearly as well but I still have that PTG bolt if you were to decide to go the M7 route.
I used the McMillan Ultralight Hunter Edge stock for that build and a PacNor fluted barrel. It was light and accurate but not like the Stolle, it was a .5 MOA with tuned loads but most were between .5 and .9 MOA.
Another route you could take would be the Savage Scout in 7.62X39 and only change the barrel. Since this design uses a floating bolt head, it isn't necessary to blueprint or square the action.
Bob

[JASmith]

Picking up on Bob's comments and speaking as someone who is not particularly skilled in precision shooting, I offer my experience with the Savage Model 16 Weather Warrior.

I purchased it in .243 Win, but any .308-length cartridge will do. I have a 20" Pac-Nor barrel chambered in .20 Grendel and am getting close to the accuracy Bob reports. Swapping the barrel is almost as easy as it would be with the Scout, but you will need to use a PPC extractor, or a PPC Bolt-Head, or go with a PPC (or 7.62X39) bolt.

I'm getting .6 to .9 moa with loads that I cannot claim to be well-made but were developed using ladder tests, etc.

I suspect that the shooting difference between the Scout and the Model 16 will be in the Accutrigger if the gun smithing to rebarrel and restock the Scout is done well. The other difference is the stainless vs blue steel. Folks who know more than me can verify that the 7.6x39 version of the scout uses the same action as the Scout in .308 Winchester. That means he can swap barrels whenever he might need to launch heavier bullets than feasible in the Grendel.