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  #11  
Old 08-08-2014, 08:52 PM
reed1911 reed1911 is offline
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The other large factor is what unit was used to develop the load. Test barrels very a LOT from source to source and many companies do not load to the full SAAMI/CIP max pressure. Some may stop at 55K vs. going to the full 60K. By and large the difference between bullets is (as stated above) Bearing surface, jacket material/thickness (i.e. friction coefficient), and core construction. Mostly in that order from largest difference to smallest, that is that bearing surface has more to do with bullet A to B than jacket than core, except in the case of a solid where the later two are the same and it is all based on total contact area ala' bearing surface. There are a lot of other little things that get thrown in to the calculation but they are more minor details that will be overshadowed by those above.
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  #12  
Old 08-09-2014, 05:07 AM
georgeld georgeld is offline
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Ken:
Increase gradually and watch closely for pressure signs.
You've played this game long enough to know what to watch
for. Just be careful, sure wouldn't want to hear about you
losing an eye or something nasty happening.

The smaller the case, the quicker pressure changes. I learned that
one the hard way.
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  #13  
Old 08-09-2014, 08:09 AM
17 Nickal 17 Nickal is offline
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When I'm working up a new load, for any bolt rifle, I start at a medium load from the book and work up till I get sticky extraction.
That is my max load for that rifle. No matter what the combination of bullet/powder/primer/barrel.
When I'm working up a load for one of my Martini's, in a standard calibre, I stay on the low side of the range. You want reliable extraction with these rifles.
For the wildcats, I use Quickload to get a max load, in the safe pressure range for the class of rifle I'm using and go under that to start with.
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  #14  
Old 08-09-2014, 07:55 PM
kenbro kenbro is offline
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Thanks to all that have contributed to this thread. I've been edukated again.

Ken.
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