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  #31  
Old 06-13-2019, 06:10 AM
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QC in ammo is an issue, but I agree with Smooth that in my personal experience the rifles chamber has a large affect also. The only rifle I've had a problem with was a very early Ruger RAR which would split about 10% of the time with Hornady 17vmax and about 50% of the time with Winchester which I will no longe use.

Most bottle neck cases get annealed in manufacture but with rimfire the brass is primed before being necked down thus it can not be annealed before being necked down. Only the thinness of rimfire brass allows this at all.
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  #32  
Old 06-13-2019, 09:20 AM
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Chamber

A few thoughts: How many barrels would we expect any manufacturer to chamber before the reamer is worn or damaged? In order to maximize the use of a tool, might it be slightly oversize (think max spec) when new?

With my first 10/22M conversion to .17 HMR, I used a barrel from a highly thought of supplier and experienced around 50% failures to extract and/or eject. I tried to polish the chamber with Flitz and a bore mop in a drill. The supplier offered to make it right but I felt like my efforts nullified his obligation so I declined. At the same time, an RFC member suggested I try a Clark Custom barrel. With no other changes, the Clark barrel completely resolved the problem. Couldn't have been anything but a chamber issue.
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  #33  
Old 06-14-2019, 07:39 PM
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Quote:
Originally Posted by BillD View Post
My Sako Quad hasn't had a split case yet.

And doesn't have accuracy problems a lot of you have encountered.

That's the problem with buying crap quality guns at a bargain basement prices and expecting the world outa them.
Although I've never had an issue in my CZ 452 Varmint, I would hardly say that the rifles that people have been getting split cases in are "crap guns". As the other gentleman had mentioned that he gets them with his "Sako Qaud" and 4 other rifles. There's obviously some bad batches out there of 17HMR. I believe it may be a combination of this and Chambers. I don't think it has anything to do with the qaulity of the firearms as you suggest.....
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  #34  
Old 06-14-2019, 09:00 PM
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Quote:
Originally Posted by BillD View Post
My Sako Quad hasn't had a split case yet.

And doesn't have accuracy problems a lot of you have encountered.

That's the problem with buying crap quality guns at a bargain basement prices and expecting the world outa them.
So your Sako Quad is a quality rifle and my Sako Quad Range, Styer Zephyr II, CZ 453& 455 Varmints & 452 Lux are bargin basement pieces of crap . . . .

Interesting . . . .
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  #35  
Old 06-14-2019, 10:50 PM
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Originally Posted by rjferber View Post
So your Sako Quad is a quality rifle and my Sako Quad Range, Styer Zephyr II, CZ 453& 455 Varmints & 452 Lux are bargin basement pieces of crap . . . .

Interesting . . . .
Either that or you're just really unlucky.
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  #36  
Old 06-15-2019, 11:03 AM
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I'm just unlucky.

When you can find visible cracks before you fire them,
is it a surprise that the micro fissures expand when the cartridge is fired?
Most never notice the problem as long as the bullet clears the barrel and the empty extracts.
How many actually check all the fired brass for splits?
How many defective necks are overlooked when the bullet still hits paper?
How many fliers are due to problems with the bullet seating and weak necks?
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  #37  
Old 06-15-2019, 10:22 PM
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I wonder if it actually matters.

I was talking with a bench rest centerfire shooter and he said he neck sizes his reloads so that it's a tight fit in the chamber and the projectile is only going straight ahead. Not aiming slightly upwards as you might have in a loose chamber.

Who knows, this loose case fitting may effect our 17HMR accuracy?
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  #38  
Old 06-16-2019, 09:58 AM
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Loose fit

That is part of the problem.
Variations in cartridge dimensions forces all chambers to be cut oversize.
Since CCI and Winchester do not produce match grade ammo
the brass does not come off the assembly line within match tolerances.
Talking with sales at Lilja when I ordered my heavy barrel stainless
they made sure I understood why the chamber was cut larger than saami specs.
When the quality control is lacking in ammo production, chambers have to be cut
to allow the use of what is likely to be purchased.
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