Lyman 457132

[bruce moulds]

looking at the drawings of 121 and 132 shows a thing that was bad for some and good for others.
probably on 121 it was not a negative due to the short nose, but some had problems with the 132.
in front of the front driving band the diameter of both bullets is 0.445", and the 132 tapers to 0.440".
this is loose in a 0.450 bore, and fits as it does when the nose sets back.
softer alloy will drive it into the rifling with more emphasis than a harder alloy.
such a nose can set back off centre, causing poor accuracy.
the plus side of that measurement is that the bullets will chamber more easily in dirty throats.
kind of a double edged sword so to speak.
those who got good results with the original postell swore by it, and those that could not master it swore at it.
if it can be got to shoot, the added bonus is that it has firther to set back before it presses hard into the riflin and causes leading like the paul jones creedmoor with its long bore ride section.
the postell, and possibly the other bullet, were designed in the day, so maybe we can learn something here.
keep safe,
bruce.