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March 22, 2018
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When shooting full power .357's in my DW 715, I get a lot of burnt powder blowback in my face. None of my other revolvers do this. I used to have a Taurus Raging Bull in .454 Casull that did this when shooting .454 Casull, but I never found out why before I sold it. Is this caused by too wide a gap between the cylinder and forcing cone? I haven't tried to adjust it, I just assumed the previous owner knew how. The gauge he gave me with the gun does fit kind of loosely, so I may try to make it tighter after I clean it.
Thanks
Garry
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DWF Supporters
June 11, 2016
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You need a .006 gap between cylinder and barrel and not overtighten to push cylinder back when putting in the gap tool.
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Dans Club
December 4, 2011
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Check and set the gap on all 6 chambers, sometimes one is higher than the others. Set gap to no more than .006" on the tightest chamber. The feeler should have light resistance but not so much that you are pushing the cylinder back against the spring loaded ball at the rear if the frame.
Also, look at the firing pin marks on the primers, they should be pretty much centered, indicating the gun is in time.
Report what you find.
BTW I assume you have a barrel wrench, you'l need one to loosen barrel nut to set gap. EWKArms on the right side bar makes the best wrenches for our guns.
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April 1, 2018
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SCORPIO said
Check and set the gap on all 6 chambers, sometimes one is higher than the others. Set gap to no more than .006" on the tightest chamber.
I shot my 15-2 for the first time today. Same blowback, but not on all cylinders. I'm not sure I've got 0.006" on the tightest cylinder.
When I set the barrel, then checked gap after tightening, I noticed some were looser than others. Is that normal, or did I get a suboptimal revolver?
Dans Club
March 2, 2008
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Weetabix said
SCORPIO said
Check and set the gap on all 6 chambers, sometimes one is higher than the others. Set gap to no more than .006" on the tightest chamber.I shot my 15-2 for the first time today. Same blowback, but not on all cylinders. I'm not sure I've got 0.006" on the tightest cylinder.
When I set the barrel, then checked gap after tightening, I noticed some were looser than others. Is that normal, or did I get a suboptimal revolver?
There were some intermittent issues with earlier production 15-2's where the front face of the cylinder has not consistently (but only slightly) flat true. Another potential issue is that tightening the barrel nut can sometimes cause the barrel to rotate slightly, changing the gap. Best practices are:
1) Make sure the threads on both ends of the barrel tube are clean, no nicks or burrs.
2) Once your gap is measured, open the cylinder and firmy press forward on the barrel tube with your thumb to tighten the barrel nut, allowing you to feel if the barrel is turning at all.
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Dans Club
March 25, 2013
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The factory says .006 but .004 works fine unless the cylinder face is seriously out of perpendicular. Even .003 can work but take a cloth with you to wipe the residue off the cylinder face ever several loads. Also take your tool at all times. The cylinder of the 15-2 will expand after several cylinder fulls, especially if shooting quickly. That is why the factory recommends a generous .006. The large frame Dans seem to be exempt from the problem. Ditto the 22. Also, never over tighten the barrel nut. Snug is good. When tightening after measuring, open the cylinder and hold the barrel tube from turning as you snug it up. Needless to say, I am sure, always make sure the gun is unloaded when adjusting the gap.
April 1, 2018
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A guy on another forum said that it could also be that the problem cylinders don't align true with the barrel, and the blow back is shavings from the bullet. Any thoughts on how likely that is?
January 26, 2009
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It’s possible. Make sure the gun is unloaded. Close the cylinder and slowly pull the trigger in the double action mode. Their should be two clicks. The first Ville is the bolt being released and the second very faint click is the bolt falling into the recess in the cylinder. The second click should come right before the hammer falls. This may take a few try’s to get right. I put the cylinder close to my ear when I do it to allow me to hear the second click. The second click confirms that the cylinder is locked into the proper position before the hammer falls and fires the gun. If it is not locking up before the hammer falls, it is out of time. This can cause lead spitting and blowback. Hope this helps.
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