4070 SS

[desert deuce]

" Like other 40 Sharps numbers, this one used a 0.403-inch-diameter bullet, weighing 330 or 370 grains. These chambers were cut to use bore-diameter bullets (often paper-patched). "

Ken, may I suggest you read the above again with this in mind. You said your .410 bullet wont slide in the fired case. That strongly suggests THE CHAMBER is cut for a bullet less than .410" in diameter.

Your original post did not ask about paper patched bullets. It inquired about grease groove bullets.

What matters is not what cartridge of the world summarizes, what matters is what the actual dimensions of the chamber in your rifle are.

Even though cartridges of the world clearly states bullets .403" in diameter you read right past that to .408 to .411 bore.

The answer to your question then is a conundrum that cannot be solved until you determine what diameter grease grooved bullet the chamber in your rifle requires using the brass cases that you have.

The original IDEAL, (pre lyman) bullet mould that I have in my hand that is recommended for that cartridge is listed at 330 grains and is inscribed 403150 which means a .403" diameter bullet.

The 370 grain bullet listed by IDEAL for this cartridge is 403171 which also indicates a .403" diameter bullet.

Both the 403150 and the 403171 are grease groove bullets.