Lyman 457132

[SgtDog0311]

Bruce, That is a valid point about the dynamic nature of flight/velocity and how that complicates any given stat. But it's a starting point and not sure how Tom or anyone would provide calculations to give a complete picture for the duration of a bullet's flight. Before his software calculates "stability" it DOES ask for velocity. Now, at a given velocity, does it calculate duration at speeds? I'd have to ask Tom that question.

As for BC and the change in shape after ignition, I reckon we'd have to say the same for all bullets that are not hard cast, unless shot with Smokeless, which accomplishes nothing near BP obturation. That is why I say its just an apples-to-apples comparison. Bullet 'A' drawn with the software compared to bullet 'B' drawn and calculated with the same software, so to speak.

But as you say, one of the biggest advantages is the ability to relay exact expectations to the mold maker. Another is this... I can pull a drawing up that I've made or one I like that is in the database and make any change anywhere on the bullet and then view the result immediately, allowing me to continue the process till I'm content with the result. Time consuming it is, but something I prefer before buying a mold unless it's an offering I'm after that exists on someone's page such as BACO.

Tom is not a spring chicken so what's to become of the software once he no longer maintains it? I know several mold makers use his software and I'm told that one (who we all respect here on the forums) may be taking over care and feeding. The question there will be is it for their own purposes or will they continue to market it.

On another note... I got my bullets from old-win yesterday and doggon do I like that PJ Sharps bullet about as much as the Original Ideal Postell. I reckon my end-state will be two molds... a variation of one of those two as well as a variation of the 121.

Regarding your and other comments on the Postell undersized nose profile or base of that nose in front of the first driving band... I have this question. I'll caveat the question with this: I have Creedmoor for my 40 caliber and I think the bore riding section is .250 long; I've always wondered about moderate leading is a result of the longer bore riding section. So my question would be this... wanting good alignment I had thought to modify either the driving band and possibly even a very short section of the nose base to be very near the bore diameter. But reading your comments, as well as having the moderate leading with the Creedmoor, I'm wondering would I be inviting the same problem?? So far with blowtubing, and with OE, I have not had problems chambering during the length of a BPCR match but I'd be interested in opinions -- that is if I've been clear enough here.