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Post by GLSHOOTER on Dec 1, 2015 18:21:31 GMT -8
I am curious what your distance to the lands is with that factory Hornady load. The throat was cut too short in one of mine causing the factory Hornady load to be jammed into the lands significantly. If that's the case, it could be raising the pressure. BHW fixed mine for me. Just a thought. That would flatten primers. Piercing without that is a whole different ball of wax. Greg
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Post by campguy308 on Dec 1, 2015 18:23:49 GMT -8
I am curious what your distance to the lands is with that factory Hornady load. The throat was cut too short in one of mine causing the factory Hornady load to be jammed into the lands significantly. If that's the case, it could be raising the pressure. BHW fixed mine for me. Just a thought. That would flatten primers. Piercing without that is a whole different ball of wax. Greg Ok, thanks...just wanted to throw that out there.
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lerms
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Posts: 113
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Post by lerms on Dec 4, 2015 5:27:26 GMT -8
I'll pull one of the bullets from the Hornady factory loads and check the distance to the lands just to see. Hell it can't hurt. I really think that it's that the ammo itself was loaded hot. Not every shot had flat primers and the one's that had pierced primers the POI was about 2" high and to the left. I checked every shell after firing like I do when shooting any new rifle.
lerms
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lerms
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Posts: 113
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Post by lerms on Dec 6, 2015 14:52:37 GMT -8
Still haven't had the time to measure the distance to the lands but I did file the extractor, manually cycled a full mag and check all the brass. All the marks on the brass are gone but only shooting will really tell. hopefully I'll make it to the range this coming weekend.
lerms
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lerms
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Posts: 113
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Post by lerms on Apr 30, 2016 11:29:16 GMT -8
OK got back to the range today finally, filed what need to be filed and the shells are in good condition however one out of five shoots has a blown primer. I've tried different lots of SST and Amax all hornady factory ammo. Any idea's? Maybe the firing pin is to long...
lerms
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Post by cosh on Apr 30, 2016 11:40:03 GMT -8
Idk, maybe long FP. I installed a long one on purpose, but I did polish it very smooth. This was in case I had to pull down/resize surplus 7.62. I haven't pushed to max yet but primers have been fine.
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Post by GLSHOOTER on Apr 30, 2016 12:20:22 GMT -8
OK got back to the range today finally, filed what need to be filed and the shells are in good condition however one out of five shoots has a blown primer. I've tried different lots of SST and Amax all hornady factory ammo. Any idea's? Maybe the firing pin is to long... lerms Yes. Hornady has had a run of that problem lately. Time to give them a call as it has nothing to do with the barrel. Long FP would be cause for a pierce not a primer falling out. Greg
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lerms
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Post by lerms on Apr 30, 2016 12:26:46 GMT -8
sorry for the bad choice of words, it is a pierce not falling out
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Post by GLSHOOTER on Apr 30, 2016 14:17:52 GMT -8
sorry for the bad choice of words, it is a pierce not falling out You might check the protrusion on the FP. It should be between 0.028 and 0.036. It might also help to GENTLY round the FP tip. Greg
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lerms
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Posts: 113
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Post by lerms on May 1, 2016 5:28:59 GMT -8
sorry for the bad choice of words, it is a pierce not falling out You might check the protrusion on the FP. It should be between 0.028 and 0.036. It might also help to GENTLY round the FP tip. Greg Ok I took measurements of 5 FPs and then the protrusion on the 5. The 264 pin OL was 3.2885 all others where between 3.275 and 3.279 the protrusion on the 264 pin is .043 all others where between .028 and .030. I'm not sure how I didn't see this before, it can be seen from just looking at it. And I have looked it over and over again but it didn't register in my head for some reason lol. The one on the far left is the one used in the 264lbc. Lerms
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Post by GLSHOOTER on May 1, 2016 6:21:34 GMT -8
If you get off into the 7.62X39 world you will want a bit on the high side n protrusion because of the harder primers. This is often accomplished by making tail a bit shorter. Some gys will also thin the front of the collar to allow for further protrusion. The placement of the collar can also vary slightly from pin to pin also so that is why you have to actually measure them.
Greg
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lerms
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Posts: 113
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Post by lerms on May 1, 2016 7:01:30 GMT -8
That fp is from a 7.62x39 BCG. So should i just swap it out for a standard FP or file it down?
lerms
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Post by GLSHOOTER on May 1, 2016 7:27:33 GMT -8
That fp is from a 7.62x39 BCG. So should i just swap it out for a standard FP or file it down? lerms Swap pins and save that one for later in case it is needed. Greg
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