147gr 9mm question

[Broom_jm]

Not sure I totally follow what you said there, USP. How far the base of the bullet sits in the case has a direct effect on available case volume, which can and does factor in the pressure equation. Determining the correct OAL, as it pertains to how a particular bullet will function in a given firearm, requires an understanding of the nose shape and location of the ogive, if the bullet has one. If this sounds like a complicated process, that's because it is. The ballisticians who write reloading manuals know how all of these things are inter-related, AND they have the pressure trace equipment to track and verify their findings. Why make it more difficult than it has to be when all the work has been done for you?

 

[U.S. Patriot]

Not sure I totally follow what you said there, USP. How far the base of the bullet sits in the case has a direct effect on available case volume, which can and does factor in the pressure equation. Determining the correct OAL, as it pertains to how a particular bullet will function in a given firearm, requires an understanding of the nose shape and location of the ogive, if the bullet has one. If this sounds like a complicated process, that's because it is. The ballisticians who write reloading manuals know how all of these things are inter-related, AND they have the pressure trace equipment to track and verify their findings. Why make it more difficult than it has to be when all the work has been done for you?

I'm not making anything more difficult.

 

[Bollorollo]

Always follow the specs from the manual of the bullet manufactors and you will never go wrong and best of all you will have a safe and very accurate load.

 

[Broom_jm]

I'm not making anything more difficult.

That comment wasn't directed at you, but the guys who ignore what the books say and pick their own OAL.