10mm 175gr LEE load question

[gofastman]

can I use 165gr jaxeted data for these?
I ask because I'm wondering how much less pressure cast boolits produce vs jacketed counterparts.
my mold has the bevel base removed and they weigh 173.5grs when sized and lubed

[jameslovesjammie]

You'd be better off using 180 grain jacketed data.

[gofastman]

You'd be better off using 180 grain jacketed data.

why?
is this based on experience?

[Sven]

The 180 gr data will be a slightly smaller powder charge than one for a 165. So I'd say it's a safety thing. Better to work your way up.

[gofastman]

yes, but wouldn't a lead bullet produce significantly less pressure than a jacketed counterpart?

it just seems to me like a lead bullet would create pressure more similar to a jacketed bullet that weighed 8grs less, rather than one that weighs 7grs more