A Copper/Tin frangible is 30% lighter than a lead or jacketed projectile. The conversion is X 1.3 your powder data from a traditional load book. Example, if you are loading a 100gr. 9mm FP, 100 X 1.3 = 130. Use the load data closest to that #. Remember that load data is is calculated on case capacity. A 100gr. 9mm frangible is as long as a 130gr. lead/jacketed projectile and if you use 100gr. powder data for it you will be over pressure and in the 9mm case that would not be good at all.
You will find a PDF load data chart on FrangibleBullets.Com. Please print it for your own use.
DO NOT CRIMP Frangibles. NO CRIMP AT ALL, no matter what Lee says. Lee is a great company. Almost all my dies and loaders are Lee. Richard Lee is at the top of the heap in his industry. Lee factory crimp dies have no place when loading frangibles.
If you crimp a frangible you will pop the top off the bullet or worse stress fracture it and it will fail on the feed ramp and jam your pistol. If this occurs in a revolver, the bullet may jam in the barrel and you will NOT pound it out like you can with a lead bullet. You will tempted to not use christian words if this happens.
To set the third die of a 3 die set, use a new or a sized case. You may flare as you normally do. With the new or properly re-sized case, unscrew the third die two full turns. Raise the case into the third die. Slowly turn the die in until you feel the die touch the case mouth. Repeat this several times especially if you are using cases with different head stamps. Cases are not all the same length even if they meet SAMMI specs. Brass grows or shrinks when it is processed.
Copper/Tin frangibles are quite different that the traditional lead based bullets. You will have to unlearn some of you loading procedure.
The polymer/copper frangible can take a GENTLE taper crimp. I still advise NO CRIMP. Frangible need not run at magnum velocities/pressures. They will perform best at standard case pressures and are way more fun to shoot.
Never carry home made ammunition in traditional or frangible projectiles. The cost difference isn't worth what might happen.
Thanks for letting me enter a long post. Captain @ FrangibleBullets.Com. 11 years in the Frangible business.