.30 caliber Boolit design

What I struggle with most when designing a boolit is the lube groove configuration and I'm wondering if there's been any recent research regarding this aspect of boolit design specifically for .30 caliber (or other small bore; i.e., .22"-.32") rifles. I want to get a couple high BC (approx. .400) molds cut for my '06, the first one shall be a PB design to be followed by a similar one with a gas check. The .400 BC requirement isn't all that difficult with noses in the 7/16" long neighborhood, with .190" meplats as long as the boolit weight is in the 190-200 grain range (about 17/16" overall length). What I'm having trouble with is "guessing" whether short grooves and/or driving bands are better than long ones. I don't want a bore riding design so I've decided on a long secant ogive sitting on top of at least 60% bearing surface.

MJ

Nah, it's not that complicated.

OK, here's another way to approach it... how much lube should a rifle boolit carry? A half grain? More? Less? Let's assume one has already determined their ultimate boolit lube.

MJ

I just shoot em', I don't design them.

I leave that to smart folks like you.

Ben

If you look at the Lee 230gr mold that Midway sells this may help you out. It is a tumble lube design and I have fired it with and without a gas check with no leading. It does not hold much lube.

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Abbreviations used in Reloading
Pointed Soft Point "Core Lokt"

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