Different bullets, same amount of powder?

[Walter W.]

I have some 9mm bullets, all 124 gr.
-Magtech FMJ
-Hornady HpXTP
-Speer Gold Dot

Will they all use the same weight of powder since they all hace the same circumference and weigh the same?

I was going to try Win 231, Bullseye or Unique.

 

[trueblue1776]

If you start at published minimums, yes.

 

[taliv]

not necessarily true for all bullets of the same weight and diameter. some bullets have different profiles, with more or less area contacting the case wall and barrel. it will usually be close though.

 

[RugerOldArmy]

Depends on the ogive of the bullet. Work up.

With what you have though, you can use my favorite 9x19 load:

5.9 Gr. Unique
124 Gr Hornady XTP
Starline Brass / WSP

Shoots great in both my BHP and CZ 75

 

[CZ57]

Length of the bearing surface is the key as well as hardness of the jacket. As far as minimum loads, I agree with trueblue. Ogive is a clue, the longer the ogive is, the shorter the bearing surface, or shank, is likely to be at a given weight. Bullets that have a truncated cone nose profile like Sierra's, typically have the longest shank/bearing surface. So, maybe it is worth noting that using all of the advice given and using a Sierra manual that provides data for their bullets, that's a pretty good way to assure yourself of which minimum load will have the highest operating pressure at a given charge. In my experience, the Sierra data is a pretty safe bet for a minimum load with a given bullet weight for every autoloading cartridge, provided you are using a bullet of similar jacket mat'l and not a plated bullet.

 

[Lone_Gunman]

Unless you are at or beyond the top end of published data, it is not going to make a difference.