Bore the steel Savage Fourtenner out to 3 1/2" or 4" chamber and load an extra length brass .410 with an ounce of shot and try it out. One thing we know is that you're not going to blow up a 12 or 20 gauge barrel with a Fourtenner in it. There is way too much steel in there to be a problem. Don't increase the powder charge, just the shot charge. 14 or 15 grains of 296 should be about right. Pressure will probably be about 13,500. Velocity will be a little slow. Use a regular plastic wad with the petals cut off. To lower the pressure, use a powder just a tad slower than the 296, but it won't be a shotgun powder. Shoot it in a gun with choke this time. You may be surprised at the performance. Charlie, you're intent on doing this, so get going.
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