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| dan_mouse... |
 Posted: Sun Oct 18, 2009 1:28 pm |
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Guest
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Does anyone know the relative difference between standard and magnum
primers?
Hypotheticaly, what would happen if someone used large pistol magnum
primers instead of standard large pistol primers in a 45acp load?
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| Posted: Sun Oct 18, 2009 5:36 pm |
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On Oct 18, 5:28 pm, dan_mouse <dan_mo... at (no spam) hotmail.com> wrote:
# Does anyone know the relative difference between standard and magnum
# primers?
# Hypotheticaly, what would happen if someone used large pistol magnum
# primers instead of standard large pistol primers in a 45acp load?
#
If you use the same charge weights, your pressure will increase.
Lyman did this for one of their handbooks, the raise was 5000-15000
psi, depending on make. Was for a rifle cartridge, but the same thing
applies. If you just gotta, back your load way off, use a chronograph
and increase the charge until you either get the same ballistics as
before or you start getting pressure signs. If you're using a top-end
load and you DON'T do that, you could conceivably be picking slivers
from your grips out of your hand, a slide out of your teeth or brass
out of your eyes, depending on the gun type.
Magnum primers are intended for lighting off large quantities of
heavily deterrant-coated powders(read "slow") regardless of ambient
temperature. There's no standard for primers, you should really work
up again if and when you change brands. Most handgun cartridges work
at low enough pressures you can usually get away without doing this
for moderate loads, but there's no guarantee here. When I change lots
of either powder or primers, the chronograph comes out and I pay
attention to pressure signs. Primers are pretty much hand-made items
and the ingredients will vary from batch to batch.
Stan
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| Gunny_2009... |
| Posted: Sun Oct 18, 2009 5:36 pm |
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"dan_mouse" <dan_mouse at (no spam) hotmail.com> wrote in message
news:hbg8b9$4dv$1 at (no spam) news.albasani.net...
# Does anyone know the relative difference between standard and magnum
# primers?
# Hypotheticaly, what would happen if someone used large pistol magnum
# primers instead of standard large pistol primers in a 45acp load?
#
Apologies in advance to the more technically qualified for the following
opinion with which they may feel free to disagree, but I've used those
primers interchangeably for years and have noticed no PRACTICAL difference
in performance in my .45 ACP. I'm sure someone will point out some
difference, like possible higher pressures, but nothing I have been able to
feel while shooting and certainly nothing that has effected the reliability
of my pistol or its accuracy so the amount of higher pressure must be small.
I do not have any technical tools for measuring the pressure, just the
experience of watching my groups at the range. So, this may be blasphemy to
the technophiles, but when I go to reload .45 ACP I use what I have on hand,
standard or magnum.
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| Dwight Keck... |
| Posted: Mon Oct 19, 2009 6:04 am |
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"dan_mouse" <dan_mouse at (no spam) hotmail.com> wrote in message
news:hbg8b9$4dv$1 at (no spam) news.albasani.net...
# Does anyone know the relative difference between standard and magnum
# primers?
# Hypotheticaly, what would happen if someone used large pistol magnum
# primers instead of standard large pistol primers in a 45acp load?
#
What if you go from pistol primers to rifle primers?
DEK>
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| Bill Smith... |
| Posted: Mon Oct 19, 2009 1:13 pm |
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#What if you go from pistol primers to rifle primers?
#
#DEK>
Rifle primer cups are much thicker (rifle magnum primer cups thicket
yet) and you might have some ignition problems.
Bill Smith
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| Posted: Mon Oct 19, 2009 1:13 pm |
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On Oct 19, 10:04 am, "Dwight Keck" <dwight_k... at (no spam) hotmail.com> wrote:
# "dan_mouse" <dan_mo... at (no spam) hotmail.com> wrote in message
#
# news:hbg8b9$4dv$1 at (no spam) news.albasani.net...
# # Does anyone know the relative difference between standard and magnum
# # primers?
# # Hypotheticaly, what would happen if someone used large pistol magnum
# # primers instead of standard large pistol primers in a 45acp load?
# #
# What if you go from pistol primers to rifle primers?
#
# DEK>
#
Rifle primers are thicker, misfires are possible. With some guns,
like the Thompson, the firing pin fall is like a brick hitting the
primer, so would probably work. 1911s, probably not. There's a
certain minimum energy needed to set a primer off, if you hover around
that, you can get inconsistent ignition and really bad accuracy. I
played around with a S&W strain screw once. Above a certain point I
got reliable ignition, but terrible accuracy, the chrono showed wide
velocity variations. Screwed in all the way, things returned to
normal. You can get the same effect if you go too far down with a
softer hammer or striker spring. Or harder primers. Had some
Fiocchis once that I had to relegate to Thompson use, just weren't
reliable in the revolvers, really hard suckers.
The primer shortage locally seems to be clearing up, just that asking
prices are way higher than the $20/K that I was used to paying a year
or so back. So no reason for substitutions here. Plenty available of
all types, even benchrest, at the show this last weekend.
Stan
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| Doug White... |
| Posted: Mon Oct 19, 2009 1:13 pm |
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"Dwight Keck" <dwight_keck at (no spam) hotmail.com> wrote in news:hbi2m1$ot8$1
at (no spam) news.albasani.net:
#
# "dan_mouse" <dan_mouse at (no spam) hotmail.com> wrote in message
# news:hbg8b9$4dv$1 at (no spam) news.albasani.net...
# # Does anyone know the relative difference between standard and magnum
# # primers?
# # Hypotheticaly, what would happen if someone used large pistol magnum
# # primers instead of standard large pistol primers in a 45acp load?
# #
# What if you go from pistol primers to rifle primers?
Large rifle primers are a slightly different height than large pistol
primers. They are taller, and depending on your primer pockets, you run
the risk of having a high primer which coudl cause a slam fire.
Small primers are the same size, so some folks have successfully
interchanged them. The safe thing is to back off on your load first &
work back up.
Doug White
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