Federal GM150M primer fit

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TexasMac
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Federal GM150M primer fit

Post by TexasMac »

I’ve been using Federal GM150M match pistol primers for several years and install them with a Lee hand primer, which provides direct feedback on the how tight the primers slide into the pocket. It may be my imagination but a new batch I bought a couple of months ago seems to fit much tighter than prior lots, requiring significantly more pressure to install. The brass is not new, having been shoot approximately 25 times. Just curious if anyone else has noticed this?

Wayne
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Kodiak
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Re: Federal GM150M primer fit

Post by Kodiak »

I also use the vintage Lee hand-priming tools, as I have several. Works great!

Have you noticed any diameter changes between older primers and the newer ones? Has Federal notified the public of any production changes?

I don't use them, so not much help.

Jim
I don't always shoot well, but when I do there isn't any reason.
TexasMac
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Re: Federal GM150M primer fit

Post by TexasMac »

Kodiak wrote:I also use the vintage Lee hand-priming tools, as I have several. Works great!
Have you noticed any diameter changes between older primers and the newer ones? Has Federal notified the public of any production changes?
I don't use them, so not much help.
Jim
Jim,
I never measured the diameters of the older stuff so have no reference for a comparison.
Wayne
NRA Life (Benefactor & President's Council) Member, TSRA Life Member, NSSF Member, Author & Publisher of the Browning BPCR book
http://www.texas-mac.com
AzTBH
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Re: Federal GM150M primer fit

Post by AzTBH »

Wayne

Do you use a paper wad underneath the pistol primer? If so, what thickness?

Thanks,
Ross
Ross McCollum
Peoria, AZ

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TexasMac
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Re: Federal GM150M primer fit

Post by TexasMac »

AzTBH wrote:Wayne
Do you use a paper wad underneath the pistol primer? If so, what thickness?
Thanks,
Ross
Hi Ross,

Nope, no wad under the primer, altough I have experimented with them. I do use a coffee filter wad over the prime hole (under the powder). I ran some experiments with both and felt the coffee filter under-powder wad offered a slight benefit. See the following articles on the subject. Note that in the articles the wad that is placed obove the primer when inserting the primer is referred to as an over-primer wad (OPW), and the wad under the powder is an under powder wad (UPW).
http://www.texas-mac.com/Large_Pistol_P ... BPCRs.html
http://www.texas-mac.com/BPCR_Primer_Wa ... sults.html

Wayne
NRA Life (Benefactor & President's Council) Member, TSRA Life Member, NSSF Member, Author & Publisher of the Browning BPCR book
http://www.texas-mac.com
rgchristensen
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Re: Federal GM150M primer fit

Post by rgchristensen »

WAYNE:
Some time ago, I did experiments similar to yours, with under-powder wads of various papers and thicknesses of aluminum. The latter used aluminum foils, beverage cans, and aluminum flashing. The expectation was that if "muting" the brisance of the primer flash was useful, the metal might be more effective. As in your results, no significant difference was seen in velocity or SD of velocity. Unlike your experience with the fiber wads, the primer flash DID perforate the aluminum metal. The primers used were REM Large Pistol.

CHRIS
RGChristensen
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