George Damron sent me a picture not long ago and something I saw in the background was a Forster Deburring Tool. It doesn't have the center post like most tools so it gave me an idea. I like the idea of a bevel base so decided to bevel the base of half the bullets to see what would happen. I haven't made a side by side test of my modified bullet and a flat base but have some ready to go for my next outing. I'll let you know what happens once I run them down the barrel.
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Interesting idea! Bevelling the bullet prior to coating would also be a possibility.
PB bullets with generous as-cast diameter that are sized nose-first after coating get skirting at the base. A bevel would provide displacement room for the displaced bullet volume.
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Rifling displacement produces fins on a plain base bullet. These fins can melt and increase possible leading. They may be uneven and unbalance the bullet on exit. A bevel base provides a place for the displaced alloy. Only a small bevel base is needed.
My experience is the accuracy advantage in pistols and revolvers is small. It is only detectable in Ransom Rest testing. Not important in normal shooting.
In rifles? The velocity limitations of plain base bullets come into play. Beveling the base is a lot less expensive than a new mold and eliminates the variables of a different mold.
Interesting, let us know what you find.
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Here is a way to make the bevel without cutting away the coating.
This was actually for bullets out of a WRACO .32-40 mould with a dodgy base and some burring around the seam. A very slight compression cleans up the burrs nicely, and could equally put a slight bevel on a plain based bullet.
The tool substitutes for the top punch in the Lyman Lubesizer. Bullet goes in nose first. Depth stop (under the die) is adjusted to allow just the right amount of compression with the handle right down. On these bullets the bases are reformed sufficiently when there is slight marking on the bullet noses.
You are only as good as your library.
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I have to do that for my 44cal bullets to fit flat in a sabot. I was getting some wild accuracy issues that seemed like the scope went bad. Then I looked at some factory made bullets and they all had a slight bevel. So chucked them up in the lathe and took a swipe at the base with a file. They shoot perfect now that the bullet can sit flat on the base of the sabots.
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