quote:

Originally posted by Sevens:
Is there a commercially available solution (or a DIY solution for the somewhat handy) to solve the rattling noise when the magazine is fully loaded in a CZ550? The mag box is slightly longer than the rounds for my 375 H&H, which allows them to slide back and forth. Did not realize how loud this could be until I was trying to sneak up on an elephant last year - should have seen the cringe on my PH's face!

Would like to fix this should I be lucky enough to go again. There has to be a shortened box (like the M70 does on their non-375 length cartridges), or a bumper/spacer that can be added to the front or back of the mag box.

quote:

Originally posted by ALF:
Yup thats about it ! Stronger springs ? tried it. tried reversing springs back to front.... even wondered of one could add somehow a coil spring under for fore part of the follower ?

As I say 3 down generally youre ok, go 4 and 5 and you can rattle your way through the bush ! only problem is African game don't respond to rattling

quote:

Originally posted by ALF:
i just went down to my gunroom and fished out some specimens to do the "shake test"

3 x Brno ZKK 375's
1 x Brno ZKK 416 Rem mag
1 x Brno ZKK 458 Win
1 x Jeffery 1926 375 H&H

All 3 Brno 375's are silent 5 rounds down and bolt open. However!
Minute you push the column down and close the bolt over the column the round directly under the bolt rides with its belt on the bolt shaft and if you shake the rifle all 3 rifles rattle.

The 416 rem is silent all the way, no rattle no noise !

The 458 same thing, no rattle not a peep or squeek !

My old Jeffery 375 takes 4 down, it's completely silent bolt closed over the 4 rounds down

quote:

Originally posted by ALF:

quote:

The CZ 550 mag box was built one size and to fit the 505 Gibbs cartridges.

Where did you cook this up ?

Rhetorical question.

When the Koucky's designed the ZKK there was not thought given to the 505 Gibbs ! The Gibbs was for all intents and purposes dead at the time when the ZKK was designed !

The ZKK 602 was first and foremost designed for the 375 H&H! The original factory parts manuals make no mention of the 505.
The original shop manual called for the 375H&H , the 358 Norma Mag and the 458 Win mag.
the max cartridge length was designated at 95mm and 14 mm base diameter . The later CIP dimensions for the 505 exceed the original design specs of the ZKK / CZ 550

When Strouhall, Mucha and Pitner engineers at CZ reworked the ZKK 602 to come up with the 550 they simply retained the ZKK action body and mag box.

The Gibbs offering was a CZ USA driven in house custom offering that was not part (parent company) CZ Czech line up !

quote:

Originally posted by ALF:

quote:

The CZ 550 mag box was built one size and to fit the 505 Gibbs cartridges.

Where did you cook this up ?


When the Koucky's designed the ZKK there was not thought given to the 505 Gibbs ! The Gibbs was for all intents and purposes dead at the time when the ZKK was designed !

The ZKK 602 was first and foremost designed for the 375 H&H! The original factory parts manuals make no mention of the 505.
The original shop manual called for the 375H&H , the 358 Norma Mag and the 458 Win mag.
the max cartridge length was designated at 95mm and 14 mm base diameter . The later CIP dimensions for the 505 exceed the original design specs of the ZKK / CZ 550

When Strouhall, Mucha and Pitner engineers at CZ reworked the ZKK 602 to come up with the 550 they simply retained the ZKK action body and mag box.

The Gibbs offering was a CZ USA driven in house custom offering that was not part (parent company) CZ Czech line up !

quote:

Originally posted by ALF:
Shootaway: I don't read no "old book" I do my own research !

Problem with your argument is that the shoe does not fit the foot (505) either ! Parts of the shoe has to be modified to fit the foot ! While the action size and mag box size is arguably the closest factory offering to the 505 it's intent was not to fit the 505.

We must remember that the 505 was at the time of the ZKK's original design dead ! There was no modern ammo for it at the time. The original 505 was a cordite loaded large cap Berdan primed cartridge !

And then something less known was that there are very few surviving original 505's and the reason was that they were originally issued to game departments where they were used and mostly abused with time.... this unlike the 500 Jeffery. Going by action and rifle numbers there were actually not many 505's built.

The majority of surviving original 505's are in rough shape because of this.

Just two months ago I had a meeting (by chance) with a "original 505 Gibbs" collector in SA and after we have been swopping data on action numbers etc on surviving Jeffery 500's and Gibbs 505's.

quote:

Originally posted by shootaway:

quote:

Originally posted by ALF:

quote:

The CZ 550 mag box was built one size and to fit the 505 Gibbs cartridges.

Where did you cook this up ?


When the Koucky's designed the ZKK there was not thought given to the 505 Gibbs ! The Gibbs was for all intents and purposes dead at the time when the ZKK was designed !

The ZKK 602 was first and foremost designed for the 375 H&H! The original factory parts manuals make no mention of the 505.
The original shop manual called for the 375H&H , the 358 Norma Mag and the 458 Win mag.
the max cartridge length was designated at 95mm and 14 mm base diameter . The later CIP dimensions for the 505 exceed the original design specs of the ZKK / CZ 550

When Strouhall, Mucha and Pitner engineers at CZ reworked the ZKK 602 to come up with the 550 they simply retained the ZKK action body and mag box.

The Gibbs offering was a CZ USA driven in house custom offering that was not part (parent company) CZ Czech line up !

if you have five people with shoe size ranging from 5-10 and the shoe is made a size 10, who did they make the shoe for? You don't need to be a genius to figure it out and you don't have to read it in some old book.

quote:

Originally posted by ALF:
Shootaway: I don't read no "old book" I do my own research !

Problem with your argument is that the shoe does not fit the foot (505) either ! Parts of the shoe has to be modified to fit the foot ! While the action size and mag box size is arguably the closest factory offering to the 505 it's intent was not to fit the 505.

We must remember that the 505 was at the time of the ZKK's original design dead ! There was no modern ammo for it at the time. The original 505 was a cordite loaded large cap Berdan primed cartridge !

And then something less known was that there are very few surviving original 505's and the reason was that they were originally issued to game departments where they were used and mostly abused with time.... this unlike the 500 Jeffery. Going by action and rifle numbers there were actually not many 505's built.

The majority of surviving original 505's are in rough shape because of this.

Just two months ago I had a meeting (by chance) with a "original 505 Gibbs" collector in SA and after we have been swopping data on action numbers etc on surviving Jeffery 500's and Gibbs 505's.