Backing up, if it was known to be a paper patch bullet and suspected to be swayed, it is likely a softer alloy and specific percentages may not matter quite as much. The size of the copper tube void(?) can probably be calculated. But, to make it shoot, is it better to get the length of the bullet close or the weight, for the same shape?
If it is a paper patched bullet, lead/tin alloy is critically important to best accuracy, especially if it has a long nose. Swaging 16:1 is something I have done by hand for many thousands of rounds. Harder alloy can be done with the right equipment, so those bullets could be anything. But I'm extremely doubtful that the two bullets are even from the same die or mould.
As for which is more important to get it to shoot, length or weight? Well, yes. Both are. If skeettx really wants to figure this out, we need a whole bunch more information.
![[Linked Image from i.imgur.com]](https://i.imgur.com/qclHjMQ.jpg)
