Hello, I've just found this forum, after a bit of searching. I'm in the UK, and foolishly stopped off at an airgun dealer whilst travelling home from visiting a customer yesterday. A few moments later, I was leaving the shop with the above rifle to add to my collection.

It is marked as being manufactured on 01/74, and is in .22. It shoots very smoothly, but I haven't had a chance to chrono it yet, can anyone give me an idea what sort of power / consistancy I should expect? I'll use this info to decide if it needs to be stripped and serviced.

TIA.

I've just been out ~ with the sites adjusted for maximum elevation, it still shoots 4'' low at 15 yards!! So I guess that it is down on power. lol.

Still, it groups very nicely, and I was surprised by the trigger, which isn't at all bad.

If anyone knows what ft/lb it should be producing, let me know. I'll chrono it tonight.

OK, I've had a look through posts on this site, and most that mention the 27's power suggest a figure of around 650 fps with a middlewieght .177 pellet and a health gun.

I make this aprox 8 ft/lbs with something like a JSB exact. Does this sound about right?

Shoots around 520 - 530 with std weight .22 pells.

This with a new mainspring.

Goos Luck!
Skillet

8 grains at 650 fps = 7.50 foot pounds.
Apparently, Macarri supplies a Tarantula XL Light Spring that will produce close to nine foot pounds (8 grains @ 705 fps) from a 27.

Hello,
Welcome to this forum and I am glad to see that you started with one of diana's finest: the 27.
Mine is a .177 and shoots with RWS R10 8.2gr 589f/s (6.32fpe)
It is from 1971 and the spring may need replacing. Also it is rated "F" which may have something to do with it's lower performance. Anyhow, the Maccari Global Tarantula Small XL spring arrived today and will soon be installed.

In order to know the velocity of your gun, take a close look at the Combro 625 which is a bargain that works.
Now you have the Diana virus and within a few days yoy will buy your second Diana, then comes number 3, 4, 5 ,.... and you will begin installing venom and maccari kits and... you will become a happier and better person

CU

Joris

Thanks for all the info, I've already got a CB-625, but have just moved house and can't find it ~ must still be in one of the packing boxes ( I hope!!), so I still don't know what power my 27 is making. I'm visiting the same customer next Friday, and might have to pop back into the same gun shop ~ he had 3 other Original's going cheap, and also some Relum's that he was virtually giving away.


Looks like even more guns that I don't really need.....

Cheers again

Technocod

3 shot string using RWS Superdomes (weighed @ 14.54 grains);

1st Shot 328 ft/s 3.47 ft/lbs
2nd Shot 327 ft/s 3.45 ft/lbs
3rd Shot 321 ft/s 3.33 ft/lbs



So its well down on power as suspected. Looks like a rebuild is needed! I'm quite pleased, actually, it will give me something to play with.

I've got an old leather-sealed Weihrauch. If I let the seal dry out it'll drop a few hundred feet/second. There's probably something better to use, but I just drop some 30 weight motor oil down the transer port and let it soak in over night every couple of tins of pellets. This keeps it happy.
--
Dan (in NY)

I too would suspect a dried-out leather seal, as well as perhaps a dried-out breach seal.

However, I would caution against using motoroil in a spring gun. It can lead to detonation, and a broken spring, or worse.

If you have a hobby shop nearby that caters to the radio-controlled car crowd, look for some pure silicone shock oil. Buy the thinnest you can find, usually 15W or 20W. Put a couple of drops (ONLY) down the transfer port and let the gun stand muzzle-up for a couple of days, if you can.

Then shoot a few heavy pellets, like Crosman Premier 10.5G. This will help distribute the lube, and quickly burn off the excess.

If this does not help, then a tear-down is in order.

A 27, no matter how far gone, is a gun worth fixing.