Diana 56TH 177 ZRT kit results

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Robo63

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Dec 29, 2019
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Nelson
Hi All, 

Has anyone got a 56 177 with the Maccari ZRT kit installed? If so what is the velocity with JSB EXACT Heavy pellets? 

The reason for the question is that I have just installed a Maccari deluxe kit in my HW80, it has transformed the gun to a very accurate easy to cock, and very smooth unit. 

However the kit drops the power in 177 to around 14 ftlbs, but its so smooth and accurate that its staying as it is and I won't be retuning it any time soon! 

The mighty 56TH on the other hand easily soaks up the recoil of a custom ordered. 135 spring, so keen as I am for the smoother cycle of the Maccari kit, I certainly don't want the 56TH running at 14 ftlbs! not when it's accurate with jsb heavies at around the 900fps mark (recently tuned to 875fps on Hector Medina 's advice, for even more accuracy) 


 
The Hatsan .135 spring might have too many coils. I tried several springs in my D56 up to .148 and they all had to be no more than 30 coils or the rifle got coil bound. I think the OD for the springs I used was 28mm but I can't remember for sure. I don't recommend anything more than .135 though since it gets way too hard to cock and the power increase is only modest. So, its not worth the effort. However, the accuracy seemed acceptable. I have the Vortek PG2 kit in mine and it has a .130 spring in it. That's as thick as I'd recommend. BTW: my rifle is .22 cal. and with the Vortek kit its pushing 14gr pellets at about 830 fps which may be 21 fpe at the muzzle.

Here;s a tip to try: I recently found out that that removing the metal bracket attached to the stock which serves to push the action forward during cocking greatly helps with accuracy. If you take a look at your D56/54 that metal tab gets pinched between the rifle's spring tube and the cocking lever. What that means is that it interferes with the sliding action during the shooting cycle. Removing that piece allows the sliding action to slide more freely and your accuracy won't get thrown off by that metal bracket. You just have to remember to push the action forward before you shoot which is easily done with a push of the thumb. I do it when I go to push the safety off. I push the action forward then push the safety off. So, just remember push/push. There's only two wood screws holding that metal bit to the stock. So, removing it is super easy. Very often, I had to push the action forward into the detente position anyway because it would fall out when I was loading or placing the rifle on to the bench rest to shoot. So, that part wasn't serving me well anyway. Out it went. Now, shooting dime sized groups at 35m is easy. Before hand, my 35m groups were more like 1.5 inches. I don't have any more open space to shoot at longer range than that but I'd sure love the chance to stretch it out further than that.

What I wish I could cure now is the lateral rocking of the action in the stock. One of the holes in the carriage that the ends of the rails sit in for rear slide assembly is larger than the other one. About the only way I know to cure that is to get a wider diameter rail or replace the carriage. But how to do that? It appears permanently attached to the spring tube. I guess I'll have to live with it as annoying as it is.
 
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Hey 

Several months later and I stumbled on this topic once more so decided to update it! 

After a conversation with Mr Maccari via email, I've concluded that the ZRT kit for the 56TH is aimed at the .22 and will definitely not push the big 56TH piston to the velocities achieved by the vortek springs in the 177 calibre (this is my own conclusion not Mr Maccari's words,) the gun is very easy to cock and feels like its got the 12 ftlbs spring! as demonstrated in my 80 as that kit will only push light to medium pellets, trying 10.34grners the velocity was way too slow for my requirements, so have modified the built in rear spacer, lopped one coil off and fitted it to a 97, in which it works very well with 10.34grners! 

He doesn't agree with shooting 10.34grn from the 177, as he is of the opinion that these are way too heavy and will damage spring and rifle. (!) as a consequence and as indicated clearly by the deluxe power kit (it's a SOFT tune Not a power kit if you fit it in a 177..HW80 .! ) 

This has not been my experience AT ALL, in fact one of my 97's is still going strong after fifteen thousand shots of the jsb heavies 10.34grn, its most favourite pellet, as is my Diana 56th.



The mighty 56TH runs the best I have found with the vortek 82513529 spring with two slip washers at each end and is Lazer accurate launching 10.34grn JSB's at 900 fps and as a result its way ahead of my other guns as a long range rabbit killer. 

As for the comment on removing the cocking tab, I recon its a good idea, on my own 56 Igot around the problem by rotating the cocking rod 180 deg after it had developed a slight curve from use, so as the lever is closed it flexes into the lever not against the tab, works great! 



Hopefully this thread is not dead and may be useful to someone out there 

PG

New Zealand 


 
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