.410 plastic wad as .416 Rigby sabot?

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Bwana John

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What are everybody thoughts as to the feasibility of using a cut down 410 plastic shot cup wad as a sabot for a .38/9mm projectile in a 416 Rigby as an inexpensive reduced load?

When I pulled a 410 shell apart the inside diameter of the wad seemed just about .36 cal .

What kind of powder? How much powder? What kind of velocity? Accuracy?

I have had very good luck withe 400 grain bullets and Trail Boss as a reduced load, but them 400 gr pills get expensive.

Has anybody tried making sabots using a plastic 3D printer?
 
The idea of makeshift sabots and plastic wadding for rifle loads is not so far-fetched IMHO: the late, great R.C. Model once gave me some outstanding advice for the use of polyfill wadding in my .223 target rifle and I've used it very successfully ever since :). Obviously caution should be used when working with bottlenecked cases, but this may not be such an issue with the .416. Other members may know more about the Rigby.

FWIW I've found that fouling can be an issue when working with plastic, though - IMO an occasional pass with an oily bronze brush is a must.
 
A .410 wad is .410" to .412" diameter. A .410 slug runs around .387" to around .415" depending on the brand. The .416 Rigby uses a .416" bullet. A .38 Special bullet is .357" diameter. A 9mm is .355" diameter.
None of it will fit a .416 barrel.
 
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