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| Author | Comment | ||
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 fiatmom |
Winchester mag primers and load development |
Lead | |
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Posts: 124 (06/10/09 06:23 AM) |
I found a source for primers but they are magnum primers. How would these affect the pressures in loads? my guess is they would go up so I would need to lower
the charge.Some powders I will be using areTrail boss and IMR 4859
these are reduced loads the others are 4350 and 4895. The cartridges will be in the 30 cal range and 45-70. FM |
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Colin |
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Posts: 2000 (06/10/09 11:51 PM) |
My guess is that magnum primers are probbly a little hot for reduced loads in Trail Boss and 4759. They should be OK for 4350 and 4895, with some reduction in
charge. Magnum primers also have somewhat stiffer cups. So you'll need a pretty hefty whack of the firing pin or hammer to set them off. If you're
using magnum primers in a 45-70 trapdoor, no problem as the hammer fall is plenty heavy to set them off.
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gschwertley |
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Posts: 373 (06/11/09 12:00 AM) active member |
To start, you said some powders you would be using are "Trail Boss and IMR 4859". Since you subsequently mentioned 4895, it makes me think you meant
to say "SR 4759" (which is a reduced charge powder) rather than "IMR 4859". When we are talking about things that go boom, it's always
nice to have the correct designations.
Anyway, if you are using something less than full charges as recommended in the handloading manuals, you probably are not going to stray into dangerous territory by substituting magnum primers for regular rifle primers. I rarely use maximum charges in anything, but I sure would not recommend substituting a mag primer for a standard primer in a max load. Powders are designed to burn under certain conditions, including the strength/duration of primer burn. Some people who have experimented with substitution of primers have reported decreases in velocity as well as increases when mag primers were used instead of standard. They have also reported decreased accuracy from such substitutions. Recognizing that velocity and pressure are not the same thing, velocity can sometimes be used as a roadsign of what pressure region you are in. |
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fiatmom |
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Posts: 125 (06/11/09 08:02 PM) |
You are correct it was 4759. Those fingers just don't do what they are supposed to. : )
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mauserand9mm |
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Posts: 1282 (06/11/09 09:00 PM) Veteran member |
It's really unfortunate to have two powders with the same number (I know the number is only part of the designation but they often are abbreviated to the
number) that are so different in characteristics. I wonder what the history of the numbering is?
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akitaholic |
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Posts: 731 (08/05/09 02:04 AM) |
mauserand, are you referring to the 4895s? In the beginning that was a non-canister formulation from Dupont (then the manufacturer of IMR powders). Huge
amounts were produced for the '06 in WWII, and after the war the surplus was sold off. Hodgdon bought literally tons of it and sold it to handloaders,
blending various lots to get a consistent burning rate. The powder was so popular that Dupont came out with it in a canister version, newly manufactured.
Strangely IMR's canister formulation was slightly faster than the surplus sold by Hodgdon. For a while both new and surplus were sold simultaneously, but
Hodgdon ran out of the surplus stuff and was obliged to find someone to make more for them because it was so popular. The new powder had the same burning rate,
but its physical properties were different. Hodgdon bought the IMR powder line and now Hodgdon sells newly manufactured IMR4895 which is the original, and
H4895 which is an equivalent.
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