load data 275 gr G/C 44 mag

[luckydawg13]

hello Veral i have a 275gr G/C boolit mold for a 44mag this is not one of your molds but i hope
that you can help me out ok this is a M/P mold 434640 if that helps i cant find any load data for a 275gr
G/C mold i would like to try 2400 and H110 could you recommend a load this is fore a 14" Contender
 thanks jim

[luckydawg13]

no one shoots a 275gr boolit with 2400 how about H110 

[kynardsj]

www.hodgdon.com           They have data for 270 and 280 gr. You should be able to work with those.

[luckydawg13]

thank you Kynardsj

[Veral]

  Boolit is a mocking word on this forum, even though I do understand that you are talking about bullets.

  There will be a good 10,000 psi difference in pressure between the various cast bullets of that weight range.  This if you stick with a good lubricant, and the spread could easily be 20,000 psi higher with some lubes compared to LBT lube.   The variables in pressure are caused by seating depth, bullet hardness, lube groove arrangement, type of bullet lube, gas check versus plain base, etc, etc.  The named ones are the main issues.

  LBT designs will generate lower pressure with any given load, or develop the highest possible velocity at maximum pressure, of any bullet design that you can buy, with quite some variation in the designs which I offer.

  I suggest though that you start with load data for a heavier jacketed bullet, using H110  or WW296.  Use the start load and take it from there, watching for pressure signs and leading.  If you get leading, you are driving them too fast and or at too high a pressure, as a general rule.

   

[luckydawg13]

thank you will do

[Veral]

  Just now looked at your original post and see that you are loading for a contender.  A fixed barrel with no possible problems requiring a crimp.    For  any single shot, seat your cast bullet out till it touchs the rifling or throat upon closing the action.  No need to slam it in tight, but just get it out there.    Using commercial cast bullets you will probably have an undersize problem, relitive to the chamber and part of the throat, so if you leave as much case flare as will chamber, the case neck will center your bullet untill chamber pressure expands the case neck out, and upsets the bullet base.   With the straight bullet to start with it will remain straighter than if it can jump and rattle a ways before it hits rifling.   This will also lower chamber pressure dramaticallly with any given charge, which will allow more powder before leading pressure levels are reached.  In other words seating out will allow the highest velocity obtainable at safe pressure, or before leading starts.

  Assuming you might be a beginner with cast.  Always start low with your charge and work up until you reach the velocity you want, or hit maximum safe pressure, or you begin to get some barrel leading.   Generally speaking, especially for a break barrel gun, pressuer and velocity will be your limiting factors.   With revolvers we can get some leading if a load is too light, if the bullet design allows blowby and pressure is too low to obturate the base up for a sure seal against gas blowby.

[luckydawg13]

thank you