Hard cast vs Jacketed Loads

A straight up 5% reduction from jacketed to cast is not going to work in all instances, things like this never do, just too many variables .

This 5% reduction might be more applicable for plated bullets, they aren't as hard as jacketed but are harder than cast .

If you wish to load cast, use cast bullet data....Lyman Cast Bullet Handbook is a wealth of information, even listing pressures of loads.
I have both the #3 and newer #4 editions and find them invaluable, highly recommend you get one.

Gary
 
Poconolg,

You give far too little information for us to give good answers that may apply to your need.

However, as said earlier by a poster that cast bullets can not be driven to the velocities of jacketed bullets, I'll have to say, That Depends!

Frankly to develop high quality cast bullet loads it is very likely to take much more load development when compared to "J" bullets.

The simple reason it the much higher level of variables.

However, from my RUGER #1 - 45/70 I have done a bunch of testing with loads of over 2000fps, testing as high as just over 2500fps and hunting with a 355gr Wide Flat Nose cast at 2300fps.

It is not uncommon for some cast bullet shooters to exceed those velocities.

I have found a 465gr Cast WFN at 1650fps to be MUCH better in the end result area, but am currently in the process of testing IMR 4895 with this bullet and should I see much improved groups over my current load or H335, I will possibly end up with a load in the 1700 - 1800fps range.

Typically a cast bullet develops less pressures the a "J" bullet of equal weight, but as has been suggested, get some information from a good source before you make a serious mistake. Lyman is one good source for such info.

Crusty Deary Ol'Coot
 
Poco,
Invest in Lyman's pistol and revolver reloading manual, it covers cast and jacketed bullets. Lots of loads and lots of info that may be helpful to you.
 
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