Why do lightfield 2.75" slugs say not for use in 3.5" chambers?

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ImARugerFan

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Just curious. They fly great, and have never had a problem out of my mossberg 835 with a rifled slug barrel on it. Two holes touching at 50 yards is fine with me, especially considering the heavy trigger and massive kick I am quite impressed.

edit: this is what lightfield has to say about it on their site....

Firing a 2-3/4" slug in a 3-1/2" chamber is not recommended because of the length of the jump the slug makes between the end of a 2-3/4" case and the front end of a 3-1/2" chamber. This can cause misalignment of the sabot on the slug, thus causing a serious pressure problem as well as poor accuracy. Slugs are NOT LIKE SHOT SHELLS where a shorter shell can be safely fired in a longer chamber with no ill effects. The bottom line is you should use a shell with a minimum case length of 3" (ideally 3-1/2") in any 3-1/2" chambered rifled barrel for best accuracy. THE CASE LENGTH SHOULD MATCH THE CHAMBER LENGTH WHEN IT COMES TO SLUGS.
Click to expand...

Weird. I guess I'm not going to worry about it since everything hits the bull, but gives me something to think about. The 3.5" shells however are going to be much harder to find, especially mid season. I'm sticking with what works.
 
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"This can cause misalignment of the sabot on the slug, thus causing a serious pressure problem as well as poor accuracy."

Seems clear enough to me. Just because it hasn't happened to you yet doesn't mean it can't happen.
 
If there was a significant concern, wouldn't mossberg inform consumers of this? I think lightfield is the only one who makes a 3.5" sabot round... I have just sent mossberg an email on this subject so I'll update this post when I hear back. I can understand the potential issue here, but I'm not about to start shooting 3.5" slugs, yet I hate to abandon such an accurate and reliable slug gun as this if there is no danger in shooting the 2.75s.
 
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I too have a Mossberg 835 and have found that the 2.75" sabots work best out of the slug barrel for it. I am holding a 4" group at a 100 yards. Not too shabby for a shotgun. That 835 has been a very good gun for me!
 
If you look at the inside of the shotgun barrel, it will make sense.

forcingcone.jpg

The 3.5" chamber has the forcing cone 1/2" farther from the base of the shell than a 3" chamber. This means that the bullet could separate from the sabot, then the sabot could hit the forcing cone under pressure. This turns the bullet into a bore obstruction.

How likely is this? Probably not all that likely. That's why you haven't blown yourself up yet.

However, the manufacturer knows how long the sabot is vs. the chamber length. They know if it's possible for this catastrophic failure to occur.

Don't take a chance.
 
It's not a Mossberg issue, Mr. T. Why would they have any word?

Either the sabot slug is safe in a longer chamber, or it's not. Doesn't matter if it's a Mossberg or a Purdey.
 
You can use the neutral wire for a ground when wiring a house,it will work just fine until it doesn't work just fine and somebody dies or the house burns down.

Some folks in rural areas still wire this way to save money and are so suprised when they die or their shack burns down.

Maybe you will never have a problem going against the manufacturers advice.
 
Consider this, also.

This manufacturer is telling you not to buy their product. There would be NO sane reason for them to do this if there were no legitimate safety hazard.
 
well the big jump is a problem for a sabot load, and im happy that lightfield tells users about it.

accuracy will be affected by the jump from case to forcing cone. ive discovered that myself using 2 3/4 inch rifled slugs in a 3 inch chamber.
 
This manufacturer is telling you not to buy their product. There would be NO sane reason for them to do this if there were no legitimate safety hazard.
Click to expand...

They also happen to be the only manufacturer (that I know of) who makes 3.5" sabot slugs. When mossberg began making this gun I'm not even sure that 3.5" sabots existed on the market. I have to wonder why they made the slug barrel 3.5" compatible? The bird barrel I understand, but not sure about the slug barrel.

No word from mossberg yet, but I will get an answer from them.

Also, anyone else aware of this warning being on any other 2.75" sabot manufacturers' boxes?
 
It's not a Mossberg issue, Mr. T. Why would they have any word?

Either the sabot slug is safe in a longer chamber, or it's not. Doesn't matter if it's a Mossberg or a Purdey.
Click to expand...

I expect a response from them. Their barrel says that I can use any 12ga round less than 3.5" safely. If there is a particular manufacturer that makes ammo unsafe to use in this barrel I expect mossberg to at least have some input on this.
 
How likely is this? Probably not all that likely. That's why you haven't blown yourself up yet.

However, the manufacturer knows how long the sabot is vs. the chamber length. They know if it's possible for this catastrophic failure to occur.
Click to expand...

And their lawyers told them to CYA with that information
 
My 935 manual said not to use 2.75 shells.
Of course that is an overbored barrel.
Click to expand...

The 835 bird barrel is overbored, but the slug barrel is not. My manual says no slugs at all through ANY overbored barrels.

Just a quick note, the barrel actually explicitly says that you can use 2.75" slugs.

pix246172640.gif
 
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It says shells.

So, you gonna sue every 3.5" chamber maker for not putting a billboard on the barrel saying "You cannot use Lightfield 2.75" slugs with this barrel"?
It's not a chamber issue. It's an ammo issue. The AMMUNITION MAKER knows the specs of sabot:chamber--it's THEIR responsibility to warn about it. The 3.5" chambered barrel is safe to use with all in-spec 2.75, 3, and 3.5" shells. Should all shotgun manufacturers put "It might not be safe to use Aquila's 1" (1.5?) slugs in a 3" chambered shotgun"?

Is it EVERY firearm manufacturers responsibility to know of EVERY SINGLE LOAD ever made for the particular caliber, and know EXACTLY which ones are safe to use, and which ones are not, and then stick those on a barrel billboard? No, it isn't. It's the AMMUNITION MANUFACTURERS responsibility to make safe ammunition, and know the specs of the ammunition in relation to different kinds of guns, because they made the ammunition in the way that it is unsafe in some. The manufacturers already have enough problems from the other side.
 
I don't think the original posted question indicated anything litigious was going to occur. I think he asked a simple question and got a wide variety of answers. In fact, his question referred to someting that had not occured to me. Therefore I am gladly reading the answers. No need to insult him!
 
I don't understand the confusion. Lightfield has explained very clearly why you shouldn't use 2 3/4" slugs in a 3 1/2" chamber. So don't do it.

They also say that 3" slugs are OK, with 3 1/2" slugs being ideal. So get some 3" or 3 1/2" slugs (if you can find 3 1/2") and go shooting.
 
Virginian said:
Apparently, fewer people can spot pure B.S. than I would have thought. If you don't shoot their 2-3/4" slugs, maybe you'll buy some of their 3-1/2" slugs.
Click to expand...

Firing a 2-3/4" slug in a 3-1/2" chamber is not recommended because of the length of the jump the slug makes between the end of a 2-3/4" case and the front end of a 3-1/2" chamber. This can cause misalignment of the sabot on the slug, thus causing a serious pressure problem as well as poor accuracy. Slugs are NOT LIKE SHOT SHELLS where a shorter shell can be safely fired in a longer chamber with no ill effects. The bottom line is you should use a shell with a minimum case length of 3" (ideally 3-1/2") in any 3-1/2" chambered rifled barrel for best accuracy. THE CASE LENGTH SHOULD MATCH THE CHAMBER LENGTH WHEN IT COMES TO SLUGS.
Click to expand...

Kindly point out the "pure BS" part.
 
natman is right: sabot slugs are not shotshells.

Would you shoot a rifle with a 3/4" jump, where the bore suddenly narrowed as much as it does in a shotgun (see above)?
 
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