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BSA R10 MK2 .177 pellet probe and general improvements.

S

Smallholdertoo

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Hi I have had my R10 for 3 weeks. It seems reasonably accurate - sub 25mm at 45m, though the odd wayward pellet. This could be explained by the pellet probe
shredding chrome or a worn probe o ring. Chrono shows between 759 and 783 ft/s with 8.3 gr RWS super field pellet .

The gun was unused for 2 years so I propose to strip it and replace all o rings and remove all chrome from the probe.

Does this make sense? What else should I be doing ? Hammer and hammer spring changes , Huma?

Smallholdertoo
 

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Stainless probe from @jeffsky (I think he lists them on the bay)
Possibly a new probe bearing as it could have flakes embedded.
A good clean out and new seals where needed

Spread is more than I'd want but it could be pellet related. I'm no fan of Superfield
Check with JSB Heavy and if its still that big a spread, I'd fit a Huma, though spring and guide setup should be fine as is
@cloverleaf has some R10 huma regs available I think
 
i would like to know why the end looks peened over in any case it is ugly
a little grease on the Oring would not hurt dry as a bone
 
robs5230 said:
Stainless probe from @jeffsky (I think he lists them on the bay)
Possibly a new probe bearing as it could have flakes embedded.
A good clean out and new seals where needed

Spread is more than I'd want but it could be pellet related. I'm no fan of Superfield
Check with JSB Heavy and if its still tha big a spread, I'd fit a Huma, though spring and guide setup should be fine as is
@cloverleaf has some R10 huma regs available I think
Click to expand...


Many thanks. I have pm'd @jeffsky re a stainless probe and await his response Any thoughts where best to get o rings and the new probe bearing?
 
Smallholdertoo said:
Many thanks. I have pm'd @jeffsky re a stainless probe and await his response Any thoughts where best to get o rings and the new probe bearing?
Click to expand...
Probe bearing John Knibbs, but check yours first
O rings, Precision Ballistics. Far cheaper than knibbs
 
Smallholdertoo said:
Hi I have had my R10 for 3 weeks. It seems reasonably accurate - sub 25mm at 45m, though the odd wayward pellet. This could be explained by the pellet probe
shredding chrome or a worn probe o ring. Chrono shows between 759 and 783 ft/s with 8.3 gr RWS super field pellet .

The gun was unused for 2 years so I propose to strip it and replace all o rings and remove all chrome from the probe.

Does this make sense? What else should I be doing ? Hammer and hammer spring changes , Huma?

Smallholdertoo
Click to expand...

It should group a bit better than that. I'd not usually suspect the probe, however the flaking issue is less than idea and I'd cuncur that one of Jeffsky's stainles items would be a better bet. I personally wouldnt worry about replacing the probe bearing.

Barrels on these often aren't great with poor surface finish and enlarged bore at the muzzle.. you can check the latter by attempting to drop a pellet nose first into the muzzle - if it falls in then that sloppy portion of the bore needs removing.

I'd expect better velocity consistency (typically 10-12ft/s over 10 shots); smaller variations are usually down to the striker assy, larger ones due to the reg. It's certainly not a bad idea to bin the often-troublesome original in favour of a Huma; which are much more reliable.

I have new Humas in the sales section for £126 posted and can do seal kits too, but judging by your post count you won't be able to see the sales section / my ads until you've got more than 50 posts. Not sure where forum rules stand in regard to buying in this situation...

There's no particular need to replace the hammer or spring; just make sure everything's clean, secure and moving freely :)
 
theres quite a bad design flaw on the R10
Scope rail/top action is only held on by 2 bolts, one at the rear, one 3/4 along the top section BUT in front of that bolt is the transfer port and 2 orings.
so the 2 orings are only getten held by one bolt to the rear, and to the front of it.....nothing.
get your r10 now and push the barrel and bottle towards each other, at the same time look at the front of the action where it meats the main tube and youll see it move together, your actually squashing the transfer port orings, and if it squashes that easy, its going to pull apart just as easy. get the digital caliper out, measure between the barrel and along the length of the bottle
im betting the gap gets bigger nearer the muzzle, some you can even see the scope rail pointing up like a boomerang.
for this reason i always advise a one piece mount to strengthen the top end
 
cloverleaf said:
It should group a bit better than that. I'd not usually suspect the probe, however the flaking issue is less than idea and I'd cuncur that one of Jeffsky's stainles items would be a better bet. I personally wouldnt worry about replacing the probe bearing.

Barrels on these often aren't great with poor surface finish and enlarged bore at the muzzle.. you can check the latter by attempting to drop a pellet nose first into the muzzle - if it falls in then that sloppy portion of the bore needs removing.

I'd expect better velocity consistency (typically 10-12ft/s over 10 shots); smaller variations are usually down to the striker assy, larger ones due to the reg. It's certainly not a bad idea to bin the often-troublesome original in favour of a Huma; which are much more reliable.

I have new Humas in the sales section for £126 posted and can do seal kits too, but judging by your post count you won't be able to see the sales section / my ads until you've got more than 50 posts. Not sure where forum rules stand in regard to buying in this situation...

There's no particular need to replace the hammer or spring; just make sure everything's clean, secure and moving freely :)
Click to expand...
Many thanks. I was not aware of the barrel issuel. I will try to get up to 50 posts asap.
 
I would polish the ends of the hammer and valve springs, dunno how much difference it makes but I like to do it. I agree with @cloverleaf and don't see any need to replace the probe beaing, it ha no affect on the firing cycle.

As @robs5230 says RWS ain't the best pellets in the world but I have always found them chrono friendly 😁

What chrono are you using?

Can you publish the string you shot on here. Someone may be able to offer some advice based on the string. Also good if you can publish a good off reg portion, this helps to show what is action and what is reg related.

Here's an R10 belonging to @Scoie following one of his many "I got a plan" moments. This is a Huma reg because the BSA reg was shot to shit when he got the gun and we failed miserably to fix it. You can see from the trend (linear MV) tha tthe reg is set a little bit low, if the reg pressure was raised slightly the trend slope would flatten and in theory we could possibly shave a 1 or 2 fps of the spread.
1680592178514.jpeg
 
Smallholdertoo said:
Many thanks. I have pm'd @jeffsky re a stainless probe and await his response Any thoughts where best to get o rings and the new probe bearing?
Click to expand...
could you let me know the price buddy. im looking to swap mine out for a stainless steel probe also. As stated above Cloverleaf did had a few huma regs for them. i purchased one from him and he couldn't help enough.. Great guy to deal with. On another note i use daystate sovereign in mine and have great results. Every barrels different but i swear they are the same as JSBs lol
 
Here’s mine for comparison to cloverleafs poor one
 

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Ive been in a few R10s, I've got 10 buggered regs to prove, seen many a probe flaking but only where the ball bearing runs, not by the oring groove.
Its possible the bore of your barrel at the breach end isnt in the centre, I've seen barrel bores off centre by a good millimetre.
It can be visible by eye but much easier if it's spun up in a lathe.
If it's off centre mid barrel it generally won't be an issue but if it's at the breach an/or muzzle it will cause accuracy issues.
Muzzle can be repaired by clocking in it using the bore (not the outside) and having it recrowned.
If it's at the breach end I don't think much can be done.
 
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