[Taterhead]

Unique is fine for modest velocity "FBI Load" levels. Quicker burning powders like Bullseye can be made to work, but suboptimal. Slower burning powders are most suitable.

Blue Dot is one of them and a great overall powder for 10mm.

My favorite for max effort 10mm loads is Accurate No. 9.

Also consider:

Hodgdon Long Shot
Accurate No. 7
Alliant Power Pistol

 

[Taterhead]

"Slower burning powders are most suitable.
Also consider:

Hodgdon Long Shot
Accurate No. 7
Alliant Power Pistol"

Of those 3 Power pistol is the fastest burning. Slower powders will give the highest velocities with the lowest pressures.

Yep. Why I like No. 9 the best, and put PP down the list.

 

[Taterhead]

Probably getting a bit more vel with AA#9. I still like BD in the 10mm, one of the only reasons I still have it on my shelf. The more I shoot AA#9 though the more I like it for the accuracy. Not sure what I am doing wrong with 800X, but I never have gotten great accuracy with it & the weighing every charge gets old quick.

100% agree point by point. Blue Dot has been great for the medium warm ammo for all bullet weights. Tons of load data, great for the new 10mm loader. It has big swings on velocities since it doesn't meter superbly, but the velocity swings don't seem to show up on paper at handgun distances. It burns REALLY clean when loaded warm. Filthy dirty at moderate loads. Blast and flash! Oh my! You know it when you're shooting Blue Dot!

A9 has been tops for groups at max velocities. My go-to for top end 10mm. A 200 gr WFN at 1250 fps is a firm handshake. And it will connect with small objects at longer distances, even from a stock Glock barrel.

My experience with 800-x was like yours except that I had some spooky pressure symptoms on top of it. I happen to think the Hornady 180 gr data is suspect, FWIW. I burned up my supply, painstakingly dropping-and-trickling, and never looked back. In fact, I think I sold the last can or two that I had. The one place that I did like 800-X was for 135 grain blasters. If you like muzzle energy, then 800-X and 135 gr 10mm bullets is the ticket!

 

[Taterhead]

I see a lot of info on 155 grain bullets so I'm thinking using it for 150 grainers shouldn't be a problem? Looks like 12.0 of BD is Max so I'll start at 11.0 or a little more.

11.0 should be a fine starting point. Hopefully the 150 gr Noslers work better for you than they did for me. They were undersized in the couple of 250 count boxes that I've used. Sized .399" or a hair under. My G20 doesn't shoot undersized bullets well at all. 155 gr XTPs are .400" on the nose so MUCH more accurate in my G20.

Regarding the earlier post about Unique... I've found Unique to be a fine powder for loading "FBI Load" or "10mm Light" ammo. 180 @ 950ish.

Some people don't like to run anything but hot ammo in 10mm. Nothing wrong with that. I like my G20 so much that I run all types of ammo. The gun is so dang versatile. Mild to wild.