Have a Care!
A good musketeer takes proper care of the musket - then and now. That degree of care should extend to the priming flask - after all, a container that may hold enough powder to set your clothes alight or rip the skin off the palm of your hand should be looked after.
One important care today's musketeer should provide for the priming flask is to check it thoroughly before the event season opens, focusing on every part that is supposed to open, then close - especially close.
At the end of the season clean the flask, especially any moving parts and plugs. Go so far as to apply a little polish or wood treatment to the wooden parts. A few priming flasks that have blown apart had wood so dry that it had become brittle, almost fragile. If inspection of the wood reveals a split, even a hairline one, seriously (seriously) consider replacing that flask before shooting again.
Some priming flasks come with push valves to allow a small amount of powder into the spout, then to close before dispensing into the musket's pan. Such valves are commonly brass and are designed to prevent any flash of fire from going into the flask body from the spout. If uncared for, the slider and its slot at the spout base can accumulate crud. That results in having to exert extra pressure with your thumb to open the valve. Worse - far worse - is the valve may not completely close after you release the slider, thereby leaving an open channel from the spout into the flask body. Keep the sliding surfaces clean, even to the point of disassembling the valve to clean.
After filling the spout with powder, release the slider, letting the spring close the valve. By accident or intent, a few musketeers may keep the thumb on the valve open to continue drizzling powder into the musket's pan. Of course, this leaves open an uninterrupted route from pan into flask body. Remain aware of all the motions of your hand when dispensing powder from spout onto the pan; leaving the slider pushed in a bit too long is a subtle error - the possible result will not be subtle.
The only part of a flask that may be made of a ferrous metal would be the spring to hold a valve shut. Anything else metal must be of something else to avoid creating sparks. If you have a flask with parts such as the spout made of a ferrous metal (steel or iron), replace before using with metal parts of brass, bronze or copper. If you persist in using parts made of ferrous metal, consider consulting with a mental-health specialist about your tendency for self-destruction.
These are simple safety devices not usually seen in period priming flasks. Today, they are commonly thin wooden disks lightly glued or simply set into the priming flask, often in the center of the fill plug at the bottom. In brief, blowout plugs work by popping out as soon as pressure inside the priming flask body begins to build. Popping out relieves that surging pressure so that the priming flask does not become a grenade, only a stationary rocket.
That blowout plug on the right was part of the flask that detonated in the video.
Right there you're beginning to realize that a blowout plug is not a fool-proof safety catch-all. After the blowout plug does its job, the burning flask shoots flame and copious smoke onto clothes, hands, the people next to you, etc. This IF the blowout plug works!
That's a serious 'IF.' The blowout plug responds to rapidly building pressure from the igniting powder. In most situations, however, the blowout plug is at the opposite end of the flask from where the explosion starts, say, a spark goes into the spout at the top but the blowout plug is at the flask's base. In between is powder that may act briefly as a cushion, enough so that there builds enough pressure at the top of the flask to blow it apart but not enough at the bottom to pop out the blowout plug. The progress of the explosion and any 'cushioning' effect is over and done within milliseconds. That, unfortunately, may be just enough time to be shot with broken shards of flask.
Cushioning aside, some blowout plugs may fail simply because they are fastened too firmly to the flask (or as part of the filler plug). Instead of a rocket in your hand, you're holding an exploding grenade.
Moral of story: Do not put faith in a blowout plug to keep you and others from being hurt.
Not the heavyweight welder's (or pikeman's) gloves, but something lighter such as leather fencer's gloves, allowing ease of finger movement and acuity of touch sensation. And these can look 'period.' Consider using them to act as a second skin between your hand and any flash, fire and/or explosion. With such a second skin, your hand may only suffer bruising; without, add first- and second-degree burns plus possible tearing.
Apart from the physical damage to the body, kit and others, the psychological effects of a priming flask explosion (or a bandoleer fire) can be like a hard kick in the face. There have been those so devastated they gave up shooting muskets altogether. Even if the blowout plug works, even if the ensuing gush of fire does not set clothes afire, even if the hand or any other body part is not burned or torn, even if... even if... the rest of the day is spent coming down from the shock and surprise, easing the hyperventilation, walking off the shakes... The rest of the event is tarnished by what just happened. You may even have to change your breeches.
Today, there are more incidences of priming flask explosions than bandoleer fires. Reviewing recent bandoleer fires, there appears to be a correlation of multiple-bottle fires to thin, inflammable strings holding bottles to the leather straps. One fiery bottle can quickly ignite the strings of adjacent bottles, with those burning strings then setting off their bottles and so on. This observation raises suspicions about bottle strings used 350 years ago: one kind of string used then was linen waterproofed with tar (or tallow or bees wax) and most surviving examples have thin strings. Today, consider as a safety measure using thick strings, perhaps coated with a fire-resistant substance.
If you do not already employ this practice, put on the bandoleer last when kitting up. Have it go over any other strapping like that for a snapsack and the sword's baldric. Should the bandoleer begin to burn, you may have a chance to fling it off before too much damage is done.
All of us use replicas of firearms of centuries past. Our replicas, as with the originals, were made for black gunpowder, only that, nothing else. So, use of some new fangled stuff like smokeless powder only adds wild cards to an otherwise barely predictable game. Yes, they may be classified officially as merely "propellants" or make more noise when discharged. Nevertheless, they open up so many more chances of something disastrously going wrong than only black gunpowder. With black gunpowder, we may justifiably worry about the safety of our priming flasks; with a modern substance, we add in concern for even the strength of the musket breech.
This list is not all inclusive. Black gunpowder holds many surprises, some of which are rude, and all are sudden. Common sense and caution go a long way to make sure you drive home from an event with a fond smile of remembrance but no scars.
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