Are These Primer Indentations Normal?

Now you got me worried : ) I'm in the middle of reloading a couple hundred for my Glock 20 and just took a magnified look at the spent primers--a few of them do in fact have a slight rectangular ghost image of the breech plate/striker face plate that is barely perceptible--but nothing as pronounced as what's shown above. On the other hand--I haven't fired any full-power hot loads either--so this might change. Currently working on upgrading barrel, springs etc before going out into full-power territory.
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There you go.

I'm curious as to why you feel the need to upgrade over factory OEM.
 
I agree with the normal Glock mark. Factory and my reloads both light and normal pressure. My 34 has a Wolf barrel which is tighter and does the same indent.
 
Its been awhile since Ive seen any Glock brass with a "bulge", and even then, it was always with the .40's, and never the 9's.
 
Quote:
Now you got me worried : ) I'm in the middle of reloading a couple hundred for my Glock 20 and just took a magnified look at the spent primers--a few of them do in fact have a slight rectangular ghost image of the breech plate/striker face plate that is barely perceptible--but nothing as pronounced as what's shown above. On the other hand--I haven't fired any full-power hot loads either--so this might change. Currently working on upgrading barrel, springs etc before going out into full-power territory.
There you go.

I'm curious as to why you feel the need to upgrade over factory OEM.
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I could use the stock barrel, and probably will with lighter jacketed loads. But I intend on developing some very warm high-power loads--and this will definitely result in greater recoil forces on the slide and other components. Some of these loads will be hard-cast and poly-coated all lead flat-noses (which the stock barrel's polygonal rifling may or may not foul more easily with). The stock barrel does a fine job within the context of mild loads. If I take an aftermarket barrel like Lone Wolf's and drop a cartridge in--it's apparent that the tolerances are tighter and there is more support at the head of the case than on the OEM barrel. This may or may not make a significant difference--I can't prove it--but I am willing to test things and see.
 
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