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jugchoke

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Discussion starter · #1 ·
Any body try this?

It appears that the Benelli crio and the matching Beretta chokes WILL fit the older mobil choke barrels.

They measure out to be able to accept the shot charge at the start of the newer choke, and the threads and clearance will let them screw right in.

Granted they look a bit ugly, the part that is in front of the threads and fits inside the muzzle on the crio type, now look like an under sized extended choke. Even the extended crio type would work, apparently, but have a short undersized diameter, before going back to approximate barrel diameter for the very end.

Since the threaded part of barrels have no function in the strength part of the choking effect, it should be safe enough.

Sort of a simple way to upgrade the older mobil chokes, and add some barrel length and weight, even if it is not pretty!

As they used to say, 60+ years ago, WWII: "If you got 'em, smoke 'em!"

I wish the Browning Invector and Invector Plus worked this way, it would be more useful to me at the moment! (Yeah, I know, we are talking a different diameter on this one!)

Clyde
 
You've got to make sure that the bottom end of the tube seats firmly on the bottom of the cut-out in the barrel. If it doesn't, a wad or the shot chare can grab the tube and jerk it out, destroying the tube and probably messing up the barrel as well.

Also, the bore diameters are probably different, so the choke desination marked on it will not apply when you move it to the other gun.

I have a friend who uses a Beretta Optima tube in a Benelli Crio barrel. It is marked Mod, but in his gun it is actually IC.
 
Discussion starter · #3 ·
Seamus O'Caiside said:
You've got to make sure that the bottom end of the tube seats firmly on the bottom of the cut-out in the barrel. If it doesn't, a wad or the shot chare can grab the tube and jerk it out, destroying the tube and probably messing up the barrel as well.
Here I believe very few of them "seat firmly", or certainly not leak tight, since the silver colored ones will show that much smoke at least gets behind the choke. The "overbore" diameter of the choke intake mouth is what keeps the above from happening. Even so much so, that the slight "loosening" so often mentioned on here doesn't become a problem, until the choke becomes quite loose. So it seems like not a complete redesign, as I had thought, but a slight "make over" to me.

Also said:
Not any more so than from normal gun to gun, (same brand, mostly, but witness Browning, Win. and Moss.), where the chokes are made to tolerances that will let them interchange.

What did surprise me was that not only did the threads match, but that they screwed right in, no drag or clearance problem at all. IF it was a major redesign and they intended for them not to be ABLE to be interchanged, one would think that the designers would have made enough clearance and/or thread change to make sure that wouldn't/couldn't happen.

A friend of mine, (who owned the mobil choked gun), went to a gunsmith, who told him that there was no problem installing the longer Crio/Optima chokes in the mobil barrels, (can't go the other way without a special custom, long wrench to reach the choke notches), and then one would have a very thin and easily damaged section of barrel wall beyond the short mobil choke anyway. Certainly not the way to go!


I have a friend who uses a Beretta Optima tube in a Benelli Crio barrel. It is marked Mod said:
But that is also normal for gun to gun, even in the same brand. The larger sized bore at the mouth of the choke, the intake end for the shot charge acts as a jugchoke and messes with the final "output" or pattern effect. (Usually, overall to the greater constriction side but of course going from one to another gun, and back, comparing them, it would be first one way, then the other.)

These "standard" factory interchangable chokes sort of remind me of the powder bushing thing. Too many folks seem to take the powder bushing size and the published charts, too literally. The same goes for the choke designations, Cyl. IC, Mod, IM, and Full. Unless you pattern your gun to find out exactly which category it falls into, or have custom fitted chokes to barrel bore diameter, one is just surmising.

I was just checking to see if anyone else had found the same thing or had actually tried it. I think my friend will be doing so shortly. I do expect that he will be asking me to measure the bore diameter through out the transition area before he fires it.

Hey, I am NOT recommending doing this! Any one is on their own there! Just a "what if" and so far, so good, not finding anything that looks "bad". Just ugly!:D

Clyde
 
Might be OK in a pinch to use a Crio tube in a Mobil gun. The flush chokes are ment to be incased by the barrel. Flush chokes expand from time to time when used as designed. You could have additional buldging or even splitting with prolonged use or with use of hard non-toxic loads.

Except for Benelli's literature, I have not seen any evidence that the Crio tubes out pattern the Mobil tubes. They are not as common and cost more to boot.

Also, the bore diameters are probably different, so the choke desination marked on it will not apply when you move it to the other gun.
Very true with the Optima/Optima Plus over the Mobil tubes. The Bore diamenters are different so the constrictions would be looser/more open with one of the Optima's in a Mobile gun.
 
Discussion starter · #5 ·
Worc said:
Might be OK in a pinch to use a Crio tube in a Mobil gun. The flush chokes are ment to be incased by the barrel. Flush chokes expand from time to time when used as designed. You could have additional buldging or even splitting with prolonged use or with use of hard non-toxic loads.

Not according to one of the choke gurus, I believe on here, (not sure exactly who), but may have been Geo T. himself. The statement was that the threaded barrel section had nothing to do with the strength of the choke. The threads have so much clearance that they do nothing structurally. And that the chokes stand alone, the threads only hold them in. (however I would not, and the friend was not thinking of using them for anything but lead.) Clyde


Except for Benelli's literature, I have not seen any evidence that the Crio tubes out pattern the Mobil tubes. They are not as common and cost more to boot.

Agreed on performance as far as I can tell, but the cost from Angleport is the same. Clyde

Also, the bore diameters are probably different, so the choke desination marked on it will not apply when you move it to the other gun.
Very true with the Optima/Optima Plus over the Mobil tubes. The Bore diamenters are different so the constrictions would be looser/more open with one of the Optima's in a Mobile gun.
Any of them will do that, because even from the same manufacture, the bores vary somewhat. But when measuring my Crio barrel bore and the friends mobil choke barrel, there wasn't any more difference than there was between the four of my Crio type barrels, thenselves!

And every choke, factory and after market extended, had between .012" and .015" "jug" effect at the mouth of the choke, coming from any of the barrels.

Can't say about the Optima or the Plus version, but according to the after market makers, they, or at least the regular Optima are supposed to interchange with the standard Crio's. The Plus, and one certain model, (forget which, info came from Angleport), of the Crio's, may be a different story.

In other words, when I ordered some extended chokes from Angleport, they were very precise in asking me just which Crio barrels I had. As they seemed to infer that there was ONE model of both Optima and Crio barrels that did take a larger bore choke. Mine, (two M2 barrels and two Ultra Lights), were of the standard type.

Personally, I think it is a shame when a factory doesn't differentiate and identify better between their products! What can and cannot, be used safely, among their various products. IF the Crio in mobil was a problem, they SHOULD have designed them so it was impossible to switch them. I doubt we are the first to question this, as apparently my friends gunsmith had already became familiar with the possibility.

Clyde
 
The statement was that the threaded barrel section had nothing to do with the strength of the choke. The threads have so much clearance that they do nothing structurally. And that the chokes stand alone, the threads only hold them in. (however I would not, and the friend was not thinking of using them for anything but lead.) Clyde
I'm speaking of the part that sticks out past the barrel. The threads are incased by the additional layer of the barrel.

Any of them will do that, because even from the same manufacture, the bores vary somewhat. But when measuring my Crio barrel bore and the friends mobil choke barrel, there wasn't any more difference than there was between the four of my Crio type barrels, thenselves!
That's because the Mobile and Crio tubed guns have the same bore diameters.

And every choke, factory and after market extended, had between .012" and .015" "jug" effect at the mouth of the choke, coming from any of the barrels.
When you get to the Optima Plus tubes they are overbored and will have even a larger variance. The Optima won't go into a Mobil gun but the Optima Plus will.

Personally, I think it is a shame when a factory doesn't differentiate and identify better between their products! What can and cannot, be used safely, among their various products. IF the Crio in mobil was a problem, they SHOULD have designed them so it was impossible to switch them. I doubt we are the first to question this, as apparently my friends gunsmith had already became familiar with the possibility.
The guns should have the choke type on the barrel. They more than likely were looking to save some money with giong with the same threads even though the are cut at different depths in the barrel.

Just think how nice it would have been if there would have been a universal chokes for each gauge for all of the manufactures.
 
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