JLouis wrote on May 25^th, 2018 at 2:06pm:


I was wondering when that would come up. I've been indexing my primers for quite some time. 

Probably not necessary if your firing pin strikes dead center. If it's off by very much at all it seems to me that indexing primers should help with more consistent ignition.   

I try to eliminate every variable I can, because the biggest one I can't eliminate is me.

Jerryh

Chris I too bevel the interior side of the flash hole and I believe I bevel it a bit more than what the tool made for the job provides. I am also very careful on how I seat the anvil back into the primer cup when seating the primer into the case and I try hard to replicate that same amount of pressure each time. I would be highly interested in what your book might have to reveal if it might also be covered. I actually try to repeat every thing I do the same, seating the bullet, drop the powder and insert the case into the chamber and try to do it with paying the up most of attention. I have watched some who just take their charged case and almost slam it into the chamber unknowingly moving the powder forward in the case. Away from the primer and possibly altering the ignition from one inserted case to the next. I try to insert my case carefully in an attempt to maintain how the powder just naturally slumps on it's own. This subject is quite interesting in that it points out just how important the case itself really is and not just simply an object for the sole purpose of just containing the powder. But actually one of the most important and critical components for achieving the very best in accuracy or just the opposite dependent on what has now been clearly discussed thus far and if one either chooses to take advantage of it or to just simply discard it. 

JLouis

JLouis wrote on May 25^th, 2018 at 5:04pm:


John, in this book, also mentioned was "centered flash holes".  I've had to toss a lot of my .223 cases because the flash holes were very obviously off-centered.............though I've never seen that in my 45-70 or 38-55 cases from Starline Brass.  The main thing Glen emphasizes is case to case repeatability.  Every case must be exactly as the last one.  

To answer your question about primer pockets.........Glen says they should be reformed with a reforming tool so the bottoms of the pockets are perfectly flat so as to let the rim of the primer sit firmly on their entire perimeter so the anvil strikes uniformly. 

I'd be glad to show you a picture from his book as to what the bevel looks like after using the Redding tool, but I'm not about to post a copyrighted photo on the forum.  Let me know if you'd like to see it. I know it was a whole lot more bevel than I'm used to applying with my Lyman deburring tool.

I believe anything affecting ignition is a place accuracy can be gained. Primer pocket depth is very important, as is uniform flash holes. I use the Sinclair flash hole tool to cut them the same size and straight. I will also reream the flash holes after a few loadings to clean any carbon build up. As stated deburring the flash hole is important.

I index my cases by leaning the rifle whichever way it needs to go until my case notch is to the top. 

The K&M Flash hole tool will deburr and chamfer the inside of the flash hole at a uniform depth and diameter. The alignment cone floats on the shaft so even if case length is not the same, the flash hole will be. They are available in different diameters.

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My bad. Here's a link to the company. Graf's and Midway both carry their products. 

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They also have a nice neck turning tool. But if I had it to do over I'd probably buy this one
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JLouis wrote on May 25^th, 2018 at 10:06am:


John, When I compete in jacketed benchrest I have not had the same issue with brass causing "funny shots" as breach seating schuetzens. Two things come to mind that might be the difference between the two shooting formats. In jacketed benchrest I exclusively use Lapua brass which is superior than what we use for the 32/40 or 32 Miller. Second is the bullet alignment in a neck turned case for jacketed benchrest. That is more superior for accuracy than a breach seated bullet in front of a charged case. But we all know are breach seated bullets shoot better than fixed ammo. Turning your case 45 degrees between shots has proven that the case is not a high quality component like our custom bullets and barrels. Keith