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Morning all - I've a cheapy 7.63x39 - has quite a tight bolt on close - and if i chuck empty once fired brass back in the chamber refuses to close.
Looks like the extractor claw is leaving pretty solid marks on the rims.
Other than sending to a smith - where should I be looking for the problem? Anything common I can look at?
cheers
@
action screws?
Post pics of brass fired from the rifle, I am keen to have a look at the case necks
Candle a projectile and see if you are touching the lands, or if there are marks on the shoulder/neck
Give the chamber and throat area a really good scrub
Clean the barrel thoroughly
Are the extractor marks a solid indentation into the base, or does it look like rotary mark left from closing the bolt ?
I'm in the Hutt, and have dies and measuring equipment for x39 cases if you want me to have a look.
Nup - same issue with action out of stock.Quote:
Originally Posted by Gibo
Should say I've checked ejector 'slot', screws, mount screws, chamber for grit etc...
+1Quote:
Originally Posted by Gibo
Yep, if a Norinco I believe some of them have the action screws too long.
I'll get a photo up when I can, but they are not solid indentations in the base, more looks like rotary marks from closing the bolt - basically rounding the outside edge off at one point.Quote:
Originally Posted by ebf
Like the angle is wrong on the claw or the claw sits too far in.... or something so that it gets pushed over the edge with too much force.
Thanks for the offer - might be taking you up on that!!
@
@thejavelin I thought that was rough machining making those marks. Never thought to try a fired case back in the chamber.
Yeah interesting aye - goes good - sighted it in and am happy with it for a goat buster/truck gun - but just want the action a bit smoother - don't want a racket in the bush smashing the bolt down.Quote:
Originally Posted by Tommy
Seems much tighter than anything I've used.
Taken most of the rough machining outta the contact points - just can't get this last bit fixed.....
Edit - I should note that the tight bolt and ejector marks might be totally unrelated.
Had a similar issue a few years back after changing barrels and head spacing was a little tighter. Ejector claw would damage the base of the brass and became very difficult to chamber a load. Took to gunsmith and had a wee bit taken off the claw and all was good from then on..
Hmmmm I was actually wondering if polishing the top of the claw might be a goer...... just a thou or so....Quote:
Originally Posted by deepsouthaussie
Smashing the bolt down? Never had it that tight, just a bit more resistance than the other couple of things I own. What make ammo are you using in it? Brass or steel cased?Quote:
Originally Posted by thejavelin
"smashing" is bit of an exaggeration - needs a forceful close.
Was just using steel cased - cheapo Tulammo.
But good point will test with a brass case tonight.....
you mention its tight to close i get this issue when the shoulder on the case gets to long, if its not the length of shoulder i wonder if the action has stretched. do any of your cases stick in the action needing to be tapped out via a rod through the barrel.?Quote:
Originally Posted by thejavelin
A lot of the Bisley's can be a right pain in this respect. Get valve lapping paste from an automotive parts shop, repco or the like, and smear it all over the bolt. Work it in the action a lot, and I mean lots. You'll find it will smooth out dramatically, allowing a nice quiet closure of the bolt and allow case extraction easily. I've done 3 or 4 now, and with that work, they become a nice cheap hack rifle.
On the bolt lugs? Where else would it hang up?Quote:
Originally Posted by peril 787b
Locking lugs mainly, and the feed plates sometimes don't sit right, machining on them is somewhat rough.
Machining on the whole thing isn't exactly sako-spec hahaQuote:
Originally Posted by peril 787b
Wouldn't affect headspace much? Suppose it's tight to close so probably not
Attachment 40020
This is one that a mate had, snapped the bolt handle trying to open it after firing 3 or 4 rounds. He was going to throw it in a lake.
I "rescued" it, reworked the action, fitted it to a ramline synthetic stock, painted the stock with "stonecoat" modified the magazine to 3 rounds (someone on here gave me that idea, no longer stabs you in the back when carrying) shortened the barrel to 16.5" and got a DPT suppressor. It's a beauty now, smooth and surprisingly accurate.
whats it like opening and closing the bolt with no case in it
Cheers - think I'll start with this - seems the least likely for something to go wrong!Quote:
Originally Posted by peril 787b
Will try and get on with it tonight and see how we go.
Same as without - still tight.Quote:
Originally Posted by northdude
But with a once fired case, cannot close the bolt without huge force.
poke black felttip pen all over bolt...work it a few times and see just where it is touching.....eg where is felt worn off...that will tell the tale better than any guessing will.
That's the beauty of the grinding paste, it only works where it needs to.
colour the whole bolt with a vivid and close it. that will soon tell you where its binding up
Looks like a few of you were spot on - thanks for the suggestions guys - especially the vivid trick - thats a goody.Quote:
Originally Posted by robhughes-games
I now have a bolt that looks like the kids got to it - but the rear of both of the locking lugs is now shiny, and the top of one lug.
...... and of all the weird places - a tiny bit in the corner of the bolt handle itself.
Oh and the feed ramps on the mag well need some serious loving.
Got some grinding paste coming from a good guy - so hopefully get this done over the weekend.
Thanks everyone for the suggestions - its looking like you've saved me some $$$ to go buy some ammo with :)
Will update after the polishing.
Just to end this thread.
Rear of the locking lugs were the main culprits - and the feed lips definitely deserved a polish.
Now have a much smoother and kinder action.
I did note that my mates one has the side of the firing pin lug(?) shaved also, not sure what that is for, tempted to try.
So its not a Sako - but its a nice wee cheap bushpig for the goats that saves traffic on my primary rifles barrel.
And at $75 for 100 rounds or Tulammo or Barnual - its cheap fun.
Had bit of a blast last weekend, happily head-shooting goats freestanding at modest distances.
http://i790.photobucket.com/albums/y...load/JW103.jpg
Well done!
