OldStuffer
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| Joined: | Sat Oct 31st, 2009 |
| Location: | Newton, Kansas USA |
| Posts: | 234 |
| Photo: | | | Are you a handloader?: | Yes | | Favorite type of cartridge to load?: | I load everything! | | My favorite chambering is:: | 12-gauge A-5, .308 Winchester BAR, .45acp (in a 1911 of ... |
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CB on the run wrote: The primer flattening doesn't concern you? I'm not being smart but have always been told to back off at that point. Additionally this rifle, even though in very good shape will little wear, is 40 years old. I do very much appreciate the information.
CB
If the primer is flattening against the breechface, no, it does not concern me, and, in all of my various manuals and othe reading on the subject, it is normal at the higher pressure levels.
Now, while I am not concerned about primers pressing flat against the bolt face, I DO NOT want the primers swelling out "flowing" into the rounded or beveled "ring" immediately arround them between them and the headstamp of the case. I also do not want them trying to push back arround the firing pin into it's hole in the bolt face.
Pressing the curvature out of the primer is one thing, like ironing a pair of wrinkled dockers, re-sizing and reshaping the primer, is fully another.
I've only seen pictures of case head brass deformed into extractor and ejector cutouts in the bolt face, I try very hard to never see them come from a gun I fired, from ammo I loaded.
THOSE are signs of excessively high pressures, actually re-shaping the primer cup, not just pressing the center flat against the steel boltface.
IMO, from the bolt actions (I have a gas auto, so I cannot tell) one of the "feels" is bolt opening and extraction after firing. Once pressures reach a certain level, the cases are more and more fully "fitted" to the chamber, and don't "spring back" as much, thus adding a bit of drag to the bolt opening and pull-back.
They are all just signs to watch, and watch for, to give you info as to what the load is doing, some type of data where you have no test sensors.
Can pressures be too high before those show up? Yes, BUT, as you test higher and higher loadings, you get to see, feel, and hear, the pressures progress,. Unless you have access to a pressure test barrel, it is always a "guessing game", but, within the loading recipes someone else has already tested, I do not feel it is completely working in the dark.
Some people start at the max loadings, I do not, I do not feel it's wise. As noted here, every gun is it's own microcosm, a given load that performs great in one, may not in another, even "identical" guns, and what is safe in one, may not be in another, at least, when it comes to loadings that "push the envelope".
I have no fear stuffing my trap or light field shotgun shells in any 12-gauge, my IDPA ammo in any .45acp, or my hunting .308 ammo in any rifle chambered for it. None of them are, IMO, real "limit ammo".
My .45 JHP loads, my 2 3/4" "Snowball #5" 1 5/8 oz 12 gauge load, different story.
Incidentally, my BAR is a late 1960's era manufacture (dad bought new). If I recall looking it up by S/N once, '68 or '69. Age does not hurt it, other than maybe needing maintenance like action springs. Age does not weaken the barrel or bolt steel, poor care, maintenance, and corrosion do those. If the firearm is in good condition, it should be able to handle any loading that it's original designed cartridge was capable of generating safely.
My best to ya CB. :)
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miestro_jerry
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CB,
Generally a flatten primer is a sign of too much pressure. With the bullet you want to use, I would use the combination of Vaeget and the 130 grain Barnes TSX. I prefer a little heavier bullet from Barnes, either the 150 grain or the 165 grain. I have found that you can't use the 168 grain TSX, because you can't get the proper OAL on the cartridge.
The joy of loading your own is figuring out what combination of brass, bullets, powder and primers works best in your rifle.
Jerry
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