🚀 go-pugleaf

How does one safely go about determining a safe load for an unlisted
bullet?  The more reloading I do, the more I see that it is far
from an exact science.

Here's the problem:  My local bullet supplier makes 125gr 135gr and
142gr bullet (hard cast) for 9mm Luger.  I currently use the 125gr
with Bullseye & Blue Dot.  I want to try the 135gr and 142gr bullets
(for IPSC minor) with one of these powders.  Of course, there are
no loads listed for either of these non-standard bullet weights.

If we take the Blue Dot powder, the published data gives:

125gr bullet  -  7.5gr to 8.3gr
147gr bullet  -  4.2gr to 5.5gr

For Bullseye:

125gr bullet  -  4.6gr to 5.0gr  (Speer)
              -  4.1gr to 4.4gr  (Hornady)
147gr bullet  -  no loads shown for Bullseye

So what would be a safe starting point for a 135gr or 142gr bullet?
Is there one?  Apparently, data sheets supplied with some Lee
equipment (powder thrower?) gives loads for 'ranges' of bullet 
weights, making this even less scientific.  Would 10gr increase in
bullet weight result in unsafe pressures if the same powder load 
is used?
-- 
-------------------------------------------------------------------
| Keith P. de Solla, P.Eng |  "Be sure brain is engaged before    |
| CMC                      |   putting mouth in gear"             |
| keith@orion.ic.cmc.ca    |                                      |