may also be employed in conjunction with a drawn reciprocation dingle arm, to reduce sinusoidal repleneration
Got a nearly new BSA Mercury Mk IV .177 and it groups like 1" at 10 yards with RWS Superdomes. The breech bolt is tensioned correctly.
The trigger isn't great, but really this is springer pistol-level accuracy.
Before I do stuff to it, do you think it is
a. A dirty barrel.
b. A dislike of RWS Superdomes.
c. A scope issue.
d. A barrel crown issue.
e. Poor technique by me.
Registered User
Jeez - with one exception I'd be pleased to get 1" groups at 10 yards with my WobbleysOriginally Posted by Hsing-ee
Webley Mk3 x2, Falcon & Junior rifles, HW35x2, AirSporter x2, Gold Star, Meteors x2, Diana 25. SMK B19, Webley Senior, Premier, Hurricane x 2, Tempest, Dan Wesson 8", Crosman 3576, Legends PO8.
Lord of the Springs
f. The choke is at the wrong end of the barrel.
Worth pushing a pellet up the barrel to check.
may also be employed in conjunction with a drawn reciprocation dingle arm, to reduce sinusoidal repleneration
Ah yes ... that would do it. 'Shed tuner' once mentioned it as a possibility with BSA barrels... This will be the first point I'll try. Then it's getting stripped and scrubbed and relubed.
Registered User
If you have only tried one pellet in it, what do you expect? Surely you will test other pellets before you do stuff to it ?
Registered User
Is it still on the original spring? The 177 i had was great with falcon accuracy plus. I have been shooting my 22 merc s a lot recently and found it better when I swapped the spring from a cut down titan no.1. You have to be spot on with your technique with these rifles, mainly due to the trigger.
Plinkerer and Tinkerer
Registered User
Is the barrel drooping? If so the barrel pivot bolt/pin is worn out. This will cause issues with the breach seal.
Registered User
How could I guess?
I dont know if you are a lousy shot or not
Too many airguns!
Registered User
I would have said, it's all those frilly knicker off cuts made into head bonnets clouding the vision, but what do I know ?How could I guess?
I dont know if you are a lousy shot or not
Hw77+7
Registered User
'nearly new'& assuming the buffer washer hasn't swollen to give zilch or varriable velocity it could be any of the reasons you have offered. It might even be something else........loose sights, mish mash of pellets in the same tin, loose action in the stock, who knows but it will be nice to hear the cause. Mercs arent that bad! Actually I think they are pretty good.
Ps did you get around to the '65 or did I miss your post?
Best of luck.
may also be employed in conjunction with a drawn reciprocation dingle arm, to reduce sinusoidal repleneration
A vintage copy of Airgun World! March 1980 which mentions the Russian invasion of Afghanistan as pressing on the 'minds' of the Government, and thus distracting from imposing more stringent restrictions on airgun ownership. Plus ca change ...
Last edited by Hsing-ee; 30-03-2022 at 10:49 AM.
Registered User
True, but they did stop making the Mercury 30 years ago!Worn pivot? Nearly new?
Dodgy Diana User
Paging @Hsing-ee
may also be employed in conjunction with a drawn reciprocation dingle arm, to reduce sinusoidal repleneration
Poor technique is the answer! It's about three times the effort to shoot well compared to a 77. Thanks for all the suggestions, going to stick with my HWs.
Last edited by Hsing-ee; 12-05-2022 at 01:53 PM.
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