The shot package, completely wrapped in a plastic wad, will exit the choke at the diameter of the choke regardless of what the new big bore diameter is and therefore; the practical, on target, pattern making choke tube constriction remains the same. The is no empirical or logical evidence to show otherwise.

 

There

 

😳

 

when moneymakers backbored a barrel jay would ask for your chokes and then ream them to match the bore — i have heard shooters who got a barrel backbored and use a choke out of their gun bag say “ boy this barrel really smokes rocks” well what happened was they are now shooting one to maybe two choke restrictions tighter !! ( im not going to debate bigger bore job value)
thats why angle port puts on their mobil chokes the bore measurement then the restriction ,as a mobil choked barrel is factory .721/.723 — i think in the forsale forum there is a forsale thread with angle port listed mobil , one side says 730 so those would be 7-9/000s tighter if shot in a factory bored barrel

 

now that im on a roll — choke restriction is basically the % change vs diameter of bore SO- a 35/000 recognized as full in 12ga is not the same in 20ga ect

 

Seems simple to me. Increasing the bore diameter while using the same diameter choke increased constriction and probably throws a tighter pattern. And...that is what Briley told me would happen when I inquired about getting my MC Beretta barrel back bored. They also would bore the chokes. I just sold it instead.

 

What he said !

 

My experience... I shoot a BB MX3 Special, was .72 4, now .738. I did the math and use a # 4 (.016) and the numbers now = .030. And it shoots a very uniform lite full pattern at 13 yards and creates soot balls on 1 6 yard targets and breaks 26 yard targets uniformly as well. Recently broke the back half of a JackPot event from 2 6 yards. 25/25. So, believe what you want and find your own sweet spot

 

Lemme see.... .... Where did I leave that dead horse?

 

Lemme see.... .... Where did I leave that dead horse?

 

Backboreing a LF .032 barrel 4 tho would make it a F .036.
All gun manufactures , barrelsmiths and choke tube installers will sing the same song.
Henry

 

WOW! 😳 again!!!

 

WOW!!!
Again!
Damn!😳😳😳!

 

.

 

Using pheasantmaster's big bore .740 example: at ignition, an STS wad containing shot leaves the hull measuring nominally .070 in diameter. The shot column within the wad then ostensibly expands to .740 within the "big bore" and is then reduced to the choke diameter of .694, exiting the barrel to then ballistically form a pattern several inches later after separating from the wad in the windstream.

or in a standard barrel of bore .729, the shot column within the wad expands to .729 and then reduces to the same .694 choke to form a pattern in exactly the same manner as the big bore.

N'est-ce pas?

 

The shot column within the wad then ostensibly expands to .740 within the "big bore" and is then reduced to the choke diameter of .694, exiting the barrel to then ballistically form a pattern several inches later after separating from the wad in the windstream.

or in a standard barrel of bore .729, the shot column within the wad expands to .729 and then reduces to the same .694 choke to form a pattern in exactly the same manner as the big bore.

Was Alfred Hitchcock and Rod Serling in your same room when you contrived this fiction?


Where are your patterns? Most importantly, where is your evidence of actual results gained from scores?

 

Where are those patterns Ramrod?

 

 

Recommend you take your gun to someone (a gunsmith) who has a bore measuring caliper and find out what the actual bore diameter is.

The "choke" is the difference between the bore diameter and the choke diameter at the muzzle exit.

Period.

So, let's say for example your bore ends up being 0.740" and you want a full choke with a 0.036" constriction, you would want to find a choke that measures 0.704 at the muzzle (or thereabouts.)

Tim

 

23 years ago I personally hands on backbored my then brand new beretta m682 gold combo. All 3 factory bores measured in @ .723, I took them to a .740 diameter. That effectively increases any factory Mobil choke tubes constriction by a nominal .017 thousandth! Fellow infamous forum member SLICKHEAD knows me me personally and can attest to the fact that my 16yard tube was an extended Briley marked Skeet by Briley. Actual measured constriction is .021 and with premium traploads it did and still does shoot very excellent counted & verified tight modified patterns as my scores reflected when I could see/shoot

 

I love Tim!

 

Shhhhh. Keep it quiet...

 

Where are those ballyhooed patterns Ramrod?

Wayback Machine

 

Where are those ballyhooed patterns Ramrod?

Wayback Machine

View attachment 1923306

It looks like you removed this from the greater context in order to fit your narrative.

Those statements are indeed true......for the same choke constrictions. When you do read that section in 'Sporting Shotgun Performance' its shown that the same differences in bore to choke in the large bore gun and the small bore gun did indeed perform the same.

Which makes sense, a 0.012" choke is going to perform the same no matter what the original bore is, and there are volumes of books and testing here that show that.
Choke sizing and thus pattern performance has always come from the difference between the expanded shot payload in the bore and the compressed shot payload prior to barrel exit.

The stumbling block that I think you've missed is that the performance of the pattern depends on what happens in the barrel.

A payload that gets slammed together right before exit is going to react opposite and equally. Its why our shot patterns spread as they go away from the a barrel.

 

I once knew a guy whos nickname was Iron Head...my have re-produced.

 

If someone cared more about facts than just stirring the pot he could round up an untouched old tight bore invector choked browning vs. a later model invector choke model at nominal .740 bore and prove to himself that he's wrong. But some folks would rather type their opinion rather than get proven wrong

 

What we have here is a paid political influencer who sometimes wanders out of the political hole to establish credibility with the audience he is trying to influence. Usually, his google-level of understanding in the subject matter betrays him. There is a reason everyone is wondering how an experienced shooter couldn't know this very basic information.

 

Hugh is like the guy that walks outside the Whitehouse and says the border is secure.

 

"I would expect that since both loads of shot are leaving both barrels at the same .729 choke diameter, they will form similar patterns. What actual physical property of a larger bore is going to change that?"

Your expectations are wrong. Yes, they leave the bore at the same diameter. But...the load that came through the most restriction has a small component of velocity on the pellets that make them fly closer together. So the component of the larger bore that changes things is that there is more constriction from the larger bore to the exit diameter.

Do you use chokes in your gun or just shoot cylinder bore at everything?

Yes, choke constrictions can be selected to make large bores and small bores shoot about the same patterns.

 

"I would expect that since both loads of shot are leaving both barrels at the same .729 choke diameter, they will form similar patterns. What actual physical property of a larger bore is going to change that?"

Your expectations are wrong. Yes, they leave the bore at the same diameter. But...the load that came through the most restriction has a small component of velocity on the pellets that make them fly closer together. So the component of the larger bore that changes things is that there is more constriction from the larger bore to the exit diameter.

Do you use chokes in your gun or just shoot cylinder bore at everything?

Yes, choke constrictions can be selected to make large bores and small bores shoot about the same patterns.

Point #1 .The load that came through the most actual and physical bore constriction is the load that came through the non big bore barrel.

Point #2 Both loads physically exit the choke tube from both barrels measuring the same .729 diameter.

#3. There is no law of motion, ballistics, aeronautics, fluid dynamics or common sense that I'm aware of supporting your "interesting" contention "that the load that came through the most restriction has a small component of velocity on the pellets that make them fly closer together". Even if that was remotely the case, the larger bore barrel is physically the less constricted of the two barrels.

# 4. Full factory chokes in all of my trap guns. Not a screw-in or big bore among the lot. It makes things simple.

 

We share a wealth of knowledge on this site and this is what happens when a person doesn’t stay in their lane. Not even having the basic knowledge of how shotguns work is as bad as Biden claiming the border is secure and Bidenomics is working. Next Hugh 3200 will tell us how inflation is in our mind and it’s not real. I’m all for banning the person that goes by Hugh 3200 permanently because he’s obviously not a shooter and knows nothing about shotguns nor is he even trying to learn. Doubling and tripling down is nonsense.

 

Why band someone who doesn’t agree with everyone else? He has a right to his opinion and a right to express it just like you and I do.
Everyone could just have ignored his replies and the post would have died.
The great thing about this country is freedom of speech and free thinking, even if I don’t agree with his opinion he has a right to express it.
What should be practiced here is respect for each other, that doesn’t mean we have to agree it just means treat him with the same courtesy you would expect, even if the other person doesn’t treat someone that way, we can be the bigger person.

It seems lately that we have way to many people on this site who think that they have to respond with sarcasm thinking they are being funny.

 

FYI

Would like to say also that I have alway been a little confused about back boring and the math, thank you for the ones who took the time to explain it better and brake it down in simple terms.