Rhodes
(.275 member)
18/07/13 07:55 PM
Re: Double rifle project, calibre 9.3x74R

ok first up to get the formalities out of the way. Anyone reading this should be aware that this info is only to be used as a guide and that actual results may vary, standard reloading and pressure measurement practices should be used on actual handloads.


Now the fun part.

Ron, this is what I get.

The red arrows show the fields I inputed with your data. I used COAL and Bullet Length as that is the most accurate way to determine the chamber space below the bullet. Everything else is generated by quickload. The results are in the red circles.

Calculated Pressure = 45,515 psi
Calculated Muzzle Velocity = 2,335 fps

This of course assumes all tolerances and powder burn rates are ideal. I see you chronographed 2235 fps which suggests to me the pressure of your loads are less than indicated here? If I reduce the powder charge until it matched your chronograph reading it shows ~41,000 psi, either way it looks to be a mild load as you say. I've also read that some users have found the estimates to be on the high side but I can't vouch for this either way.



hope this helps.



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