Rifle Muzzle Cap?

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Finger cots seems the most affordable and most effective assuming you don't have a front sight base. That said I have never covered the muzzle of any gun I have hunted with and I grew up in the Snowbelt in NE Ohio. I have hunted in some nasty weather both rain and snow and never felt the need for a muzzle cover. If I fell I unloaded and check for bore obstructions. YMMV.
Muzzle loader hunting in rain is the only time I worry about it.
 
Muzzle caps that are on the outside of the barrel are one thing, but plugs that enter the bore (tompions) are something else entirely. Like any bore obstruction, these could be dangerous if the weapons are fired with them in place. Barrels have been known to burst because of bore obstructions.

I was at a Civil War reenactment where someone left a tompion in place, and when he fired his blank charge, the tompion became a projectile. It was later found embedded in a drum being used in the opposing line.

It's not unheard of for ramrods to also be fired accidentally as projectiles. That's why many events strictly prohibit ramrods and tompions on the field. (You don't need to ram the charge if all you're using is powder.)
 
Even then I have not had a problem. I am not using patch and round ball or a flint lock. Percussion and maxiball or sabot has proven weather resistant for me so far.
It probably is unnecessary. But I only get 2 days to hunt with my muzzleloader. I don't want to risk it when the added measure is so easy.
I also put a dab of Vaseline over the primer.
 
I normally use a soft foam earplug in the barrel. I've probably shot a few dozen or so out of the barrel over the years. The air column in the barrel blows it out about 10-15 yards and while I wouldn't use one for precision shooting it has no discernible affect on accuracy. I've come to prefer them to electrical tape as they are more visible and always have a lot of them since I wear them nearly everyday.
 
In training and not shooting blanks, I had a small cap to keep mud and dirt out of my M16/M4 barrel. And I still have it. Slides right over the birdcage/A2 muzzle device. The one I bought years ago advertised it can be shot through in an emergency. I always just left it off when I had live rounds. I am sure similar devices exist for other rifles.

https://www.amazon.com/Muzzle-Cover-Cap-Black-5-Pack/dp/B009PSZJ8Q

For our large truck firearms, we used all sorts of muzzle devices to keep the ubiquitous sand out of the barrels of Mk19, M2, M240s etc when not on patrol. We used non lubricated condoms, tape, and even soda cans that had the top areas cut out. Necessity is the mother of invention.
 
Sent both a dpms and a colt flying into a ravine and hillside after taking a tumble. I use the black plastic .mil muzzle birdcage covers now.
Filled one barrel about 3 inches with mud/clay and the other had dirt in it.

After having multiple rifles size after being in the back of a ww2 willys jeep and full of dust in/on everything.
If I'm romping around outdoors the muzzle is covered
 
I seem to use tape more often every year, used to be just on had weather days hunting. Then all the time when hunting, now anytime the gun goes out side it gets tape. One time after coming in from trying to shoot some woodchuck, I left my rifle on the porch at a friends farm. After lunch as I was grabbing my gun I see a mud dobber fly out the barrel. I pulled the bolt and could not see light, I'd say a good inch was filled with that dirt stuff. I ended up soaking it in a water catch barrel for a few minutes because that stuff was like Portland cement.

Now a kinda have compulsive problems needing to checking my barrel before shooting.
 
The cheapest, most effective, and least inconvenient cap I use (all the time) when hunting is electrical tape. I have tested it's effect on accuracy and found none. It is not dangerous in any way. It stays in place and is very effective. Why would anyone spend money on complicated devices to do the same thing?
 
kBob story warning!

Mid 1970's and Drewsy and I are training with the Company at Hohenfels and stuck out on a "Combat Out Post" with out M16A1s loaded with blanks. Now unlike a listening post at night or Observation post in day light, a SEE OH PEE engages the enemy to force them to depoy into assault positions and slow down giving the defenders a heads up and time.

We were getting scattered showers and it was misserable, but happy day they sent out B rations! That would be a Ham & cheese sandwich and a bit of fruit. Drewsy and I had a little picnic and I had a Darned Old Duck orange juice in those little cans for my fruit. Having drained the can I pulled out my P38 Shellby can opener on my dog tag chain and cut the holed top out of the can and washed out the can with canteen water to both clean the can and get another half an of amazingly weak "orange juice" I was debating opening the other end of the can when it started to rain. Now we had black plastic covers they issued when we had live ammo because of the fear of water as a barrel obstruction (hey it was in the comic book manual) but on blank training excercises they stayed in the crate in the arms room.

It started to rain again and heavier than in the morning and the NCO that brought out our picnic said we could not keep our rifles under our ponchos any more

ah ha! I have the Darned Old Duck prepped for use as a sloppy fitting muzzle cover.

A bit latter Drewsy signaled me that he had movement on his side of our half volkswagon beetle sized rock. I peeked around and from my angle saw nothing. As I turned back to my own sector an "Aggressor" stepped around a bushy tree only about seven yards away that they had not let us clear. He was stareing at Drewsy's end of the rock. So I did a quick point and pulled the trigger.

The "muzzle cover" flew straight and only dropped a little to smack the opposing kid just over the belt buckle. He staggered back a bit in shock to be hit and to see me....fired a burst of blanks in my general direction and started screaming "I got You!" like eight year olds playing army in the back yard.

That was my most fun with a Muzzle cover!

We did take the black ones on a range and have four guys shoot through them at 100 meters. All hit a kneeling man reactive target at that range and three of the covers took hits while on or near the muzzle and none went more than 10 yards down range. One was neatly holed in the center like it had stayed on until the bullet passed, one near the edge and one on the side. The oone un hit was actually closest to the firing line.

On an Occasion at Graffenhower when we had to pull live ammo stuff occassionally but were mostly using blanks for training one guy had a Muzzle cover in a blank loaded rifle in a nice comfy hole in the ground. A useless driver/clerk that seldom did field duty wandered over and started talking to the guy with the Muzzle cover. I was running wire from a donut roll to link holes in a hot loop with a sound powered phone in each hole and happened to be tying off to a blue berry bush immediately behind the hole when the conversation went down hill.

Remf: Hey Old Man, what do suppose would happen if you shot that gun with that muzzle cover on it?
Old Man : Umm, it would just blow the cover off.
Remf: But what would it do if you shot some one with it?
Old Man: you really want to know?
Remf: Sure.
Rifle: BLAM!
Remf: AAAAIIIIEEE! I'm SHOT! (falls and rolls about on ground screaming)

Seems the answer to the question was from one foot away it would bruise the leg just over a boot top all the way around and cause victim to be exempt from military duties 24 hours and on light duty for several days.

I finished wiring in the platoon and went back to my own hole where as I approached I asked my Battle Buddy to point his muzzle covered rifle 180 out from me.

A couple of years later while stateside I noted that all the muzzle covers were red and wondered if that was to remind folks the had one in place.

-kBob
 
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