doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com Vent ribs on side-by-sides - why???

It�s obvious what he�s doing here, just causing trouble, no more no less. He�s probably on his Dad�s computer when he's away on a business trip.

Ah, the original post.

If you don't want to shoot through heat waves, and side-by-side tubes can throw up a lot of mirage in a flurry, then a vent rib.

Too, on certain guns they look natural, not that they necessarily compliment the lines of the gun, but because of they have beoome an accepted style. The M21 leaps to mind. This is analogous to the post of a week ago about stocking to the fences. If nothing else, with most of a centruy and a half of precedent, stocking to the fences is an established, expected style on a Europeon sidelock action, but people would reject that adaptation on, say, an L C Smith.

I recall someone mentioned degreasing the barrels all over before a shoot, to reduce the effect of heated oil contributing to heat waves

Not trying to be argumentative, at all, but please explain to me how sighting above a vent rib, that is possible 1/4" higher than a solid rib, will eliminate "shooting through heat waves". The heat waves are mostly coming off the barrels.

SRH

Amarillo Mike, you're the one who first mentioned the John Olin connection. The Cody letter doesn't mention either Spencer or John Olin. Some time back, in some other world, I think the case was pictured with Spencer Olin's name on it. However, there is no reason to think that the gun was made for him when the Cody letter specifically says the gun was made for Marshall Field. How John Olin's name got into the mix is beyond my comprehension. What the heck is a "raised water table" anyhow?

Eightbore: Go to www.bishopsfineguns.com and you can see the paperwork in full.

Vent ribs on a side by side makes as much sense as wearing galoshes with a tuxedo.

Spencer Olin's name is on the second page of the letter. You can see it in the ad at Bishops.

http://www.bishopsfineguns.com/3136.html

http://www.bishopsfineguns.com/313614.jpg

Best,

Mike

Stan - no offense taken.

On a side-by the mirage is most intense right over the juncture of the barrels, i.e. the ribs. As nasty as mirage can be, it dissipates pretty rapidly with distance, so that little quarter inch ends up being a big deal. Not perfect, mind you, but it goes a long way. Hell, even when I shoot trap doubles with my O/U I will finish the round with mirage.

In the case of trap doubles you're lighting off both barrels about once every 30 seconds. They get hot, Damn hot. My casual observation is that that shotgun barrels, thin as they are, tend to cool very quickly, so that if your rate of fire slows down a bit, say two shots every 60-90 seconds, mirage is a much smaller problem.

Cheers

Thanks for the reply, 5E. I don't shoot trap, feathered stuff and sporting clays being my games, but have experienced some hot shooting at times. In Cordoba I averaged one round every 14 seconds for 3 hours at a time. Some spells during those three hour shoots would get much, much faster than that, with me loading and shooting literally as fast as I could for a few minutes at the time. I used a vent rib gun, a 687 SPII with 30" barrels, but never even noticed mirage.

I am well aware of the effects of mirage on precision rifle shooting, but I guess I watch the bird so hard that I've never noticed it shooting a scattergun. Still say I don't believe I have ever missed a bird because of it.

Thanks.

SRH