Shotguns - back bored barrels - pro's and con's

[Salop Matt]

As above really folks, what are the pros and cons of back bored barrels ?

ATB

 

Matt

[Underdog]

No problem at all. Its not that much of a difference.

Some will say fibre wads will struggle but it is nonsence.

U.

[Guest cookoff013]

as UD said, not much difference. maybe faster speeds (if any can be detected from natural speed variance)

it has been said that they pattern better, but in all honesty, thats rubbish just due to the chokes / choking /multichoke / variables.

most sporters if not all, do a decent job of putting shot at 30yards. shell development has moved so much its pushing physics not anything else.

[dashman1]

As above posts none really atb

[Westward]

Well there's back boring which is enlarging the existing bores in order to lighten the barrels and/or produce better patterns (allegedly). Back boring is often combined with lengthening of the forcing cones which is also done to improve patterns (allegedly) and also reduce felt recoil.

 

And then there's over boring which is where the gun is produced with a bore size greater than 'standard' which for a 12g is 0.724" or 18.4mm. Most current guns have over bored barrels, generally between about 0.732" and 0.740" depending on the maker. Many also have much longer forcing cones on their newer models.

 

I have no idea whether BB or OB barrels benefit patterns or degrade performance with fibre wads but they can help with barrel weight and handling and when combined with longer forcing cones there can be a marked reduction in felt recoil.

[Underdog]

If I remember right a standard true 12g is .729". There is a tendancy for european guns to be smaller yes!

If I remember correctly, back boring or over bore was originally investigated to get better perfomance and to help peak pressures and recoil with magnum doses of shot. Back in the eighties I think.

I would personally go fo fit first. Nothing wrong with it mind, it would not be important to me I mean :-).

 

U.

[Guest cookoff013]

UD,

not always, there has been both a resurgence in overbore and underbore, this is the only thing the manufacturers can change, because the chamber tollerences must be industry spec regardless of forcing cone, bore length, bore size etc.

 

modern carts perform so well, there is nothing in it. IMHO.

 

why shoot factory ammunition when, i can taylor a load from 1000fps to 1700fps with 21grams or lower to 50 grams... (not that i could find 50grams @1700fps.)?

[Harnser]

I have guns that are back bored and not back bored .I cannot tell the difference .

Harnser.

[Old farrier]

Hi

I have 2 guns same make same length both multi choke

One is back bored the other not

They both shoot very well no noticeable difference on clays

However on live quarry the difference is very evident

The back bored one kills so much better the difference has been noticed by freinds

So IMO there is a difference

Hope this helps

All the best

Of

[Underdog]

UD,

not always, there has been both a resurgence in overbore and underbore, this is the only thing the manufacturers can change, because the chamber tollerences must be industry spec regardless of forcing cone, bore length, bore size etc.

 

modern carts perform so well, there is nothing in it. IMHO.

 

why shoot factory ammunition when, i can taylor a load from 1000fps to 1700fps with 21grams or lower to 50 grams... (not that i could find 50grams @1700fps.)?

yes.....was on about years ago.

 

Back boring can also be used to tighten a choke up in a fixed choke gun. Bit like jug choking. I did it to a muzzleloader once with good results.

U.