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Double Rifles, Single Shots & Combinations >> Building Double Rifles & Gunsmithing

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apr1775
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Reged: 02/10/08
Posts: 57
Loc: Virginia, the united States of...

Sidelock vs Boxlock; Bar Action vs Back Action
#125255 - 28/01/09 09:42 AM

I 've been reading in a few different books about actions used for building double rifes. Some sources suggest that some sort of back action sidelock, either hammer or hammerless, is better because less metal is removed from the frame. This makes sense, but it would mean more wood removed from the stock; not good on a heavy recoil rifle. Are these considerations more theoretical or are there examples of failed double rifles that can cleary be attributted to design flaws. After all there are good examples of the various designs.

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Der_Jaeger
.375 member

Reged: 09/10/08
Posts: 607
Loc: SE Pennsylvania

Re: Sidelock vs Boxlock; Bar Action vs Back Action [Re: apr1775]
#125304 - 28/01/09 10:25 PM

I'm not sure if any have actually failed but, from an engineering view, the back action sidelocks do provide for a stronger action and, since the leaf spring and lock components lie flat against the sideplates, really do not need any more inletting space in the stock than a standard H&H style sidelock. No more wood is removed by utilizing a back action design.

The only difference between a Bar Action and a Back Action is the position of the leaf spring; one is pointed toward the rear and the other toward the front. In my opinion, the bar action gives the best sear/tumbler engagement angle and can be adjusted much better. Bar Actions, on the downside, require much more inletting along the acyion bar. This is why some of the older guns employed a Greener Crossbolt on their Bar Action sidelocks. I think that modern metals offset a lot of this. That being said, if I had the means to order a bespoke sidelock, I would do so with a back action sidelock design.

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doubleriflejack
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Reged: 11/11/07
Posts: 352
Loc: Oregon, U.S.A.

Re: Sidelock vs Boxlock; Bar Action vs Back Action [Re: Der_Jaeger]
#126495 - 10/02/09 08:33 AM

I would agree, BUT if one would prefer to spend a bit less money, and get a strong action too, for a double rifle, I would opt for a boxlock, rather than a sidelock, especially if it were for a rifle that creates more stress on an action.

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bonanza
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Reged: 17/05/04
Posts: 2335
Loc: South Carolina

Re: Sidelock vs Boxlock; Bar Action vs Back Action [Re: Der_Jaeger]
#126513 - 10/02/09 11:45 AM

The double rifle is the rifle makers rifle. Prudey's self-opening, bar-action, ejector, top-lever is the ultimate conclusion of state the art. It's the "complication" of rifles.

If I could afford to have a double rifle made from scratch it would be a top-lever, hammer back-action, ultra round body 450 3.25" extractor with spare hammers, strikers and claw mounts right at 10 lbs.

This is a throw back to an earlier time, but exposed hammers are so handy.

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Paul
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Reged: 28/08/07
Posts: 1031
Loc: Melbourne, Victoria, Australia

Re: Sidelock vs Boxlock; Bar Action vs Back Action [Re: bonanza]
#126578 - 10/02/09 08:57 PM

While the back action should be more solid, it often finishes up rounded off to save weight and then may sacrifice a fraction of its strength. The bar action, on the other hand, still has an H-girder profile to maintain the strength.

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