Why 180 grain?

[sgmtino]

Why are we only seeing 180 grain loads from Sig and Sellier & Bellot? I would love to see more variety on the market.

[Dave84]

It's the standard for 40 and 10mm. Kind of like 115 grain for 9mm and 230 grain for 45. We may see more options from them later. They've got their foot in the door with the standard weight.

[sqlbullet]

This.

147 grain 9mm, 180 grain 40/10mm, 230 grain 45 are all about .160 sectional density.  This is very common SD cluster.

The 115 grain 9mm is the same SD as 155 40/10 and 185 45 ACP.

[Trapper6L]

As you go thru the learning process of shooting you'll come across either P O Ackley or Col. Hatcher in regards to optimum bullet weight vs bore diameter. In my younger years, I had several conversations with Parker Ackley about shooting. He was adamant about optimum bullet weight for each bore diameter. The bullet weight of 180gr will yield the best velocity, retain the best energy, and yield the best results....and the keyword here, averagely for the 40 pistol bore. Yes, you can push a lighter bullet faster but it won't retain the energy. You can shoot a heavier bullet that that will retain the energy but at a much reduced velocity. If you ever get a chance to read Hatchers Notebook, the 03 Springfield, we know it as a 3006, was no accident. The case capacity and bullet weight were extrapolated before the rifle was ever chambered. Same with the 7.62x 51 or 308 as most know it. Hatchers Notebook will even explain the rocket engine effects of the muzzle blast and how to reduce recoil with the same weapon and bullet. Interesting read if you ever get the chance.

Can't believe I found Hatchers online
https://archive.org/stream/Hatchers_Notebook#page/n0/mode/2up