I shot a few of these out of a M1909 Argentine Mauser in 7.65x53 last weekend. They shoot well, but I have some more load development to do. I could touch these off at 2200 fps in the mauser at safe pressures, but will likely stop at about 2000.
They are 0.311" and my bore is 0.312", but they still shot well. Their very long length likely compensated for being a bit undersize. The mauser's 1:10 twist easily stabilizes the long bullet. Another benefit of this particular bullet is that the throat of the M1909 is very long, so I can seat it well within the case and still be close to the lands. The 150gr Hornady is over 0.200" from the lands when seated to a minimum depth (but still shoots well).
Next to no thought seems to have gone into this bullet - it's just a flat-nosed cylinder - but it's cheap and shoots well in my gun.