American Reloading MP Powder and Load Data List

[Michael J. Spangler]

The new chart they published is super helpful, but it assumes they get consistent lots of powder. There is a dash number that goes after the main number for the powder; I can only assume each dash number represents a specific supplier or batch of powder.

I’m thinking it’s more of a lot variation. I know it’s not a big deal to most shooting but the accuracy guys or USPSA that need to meet a power factor will pay attention when they get a new lot. It can be faster or slower.

My guess is that’s all this is. Don’t assume 155-1 is the same as 155-2.
Most manuals will tell you to go back to starting loads and work up when working with a new lot of powder. Same here.

[Havok7416]

Lot/batch. Whichever term one prefers.

I've had some mild interest in these powders, but I have had some other priorities so I haven't had an opportunity to experiment yet.

[Slm9s]

I don't understand why they didn't include all the powders they've sold. For instance, I have 650, 662, and 663 and they're not listed. Why wouldn't they put out a complete list of their powders?

[Delkal]

I don't understand why they didn't include all the powders they've sold. For instance, I have 650, 662, and 663 and they're not listed. Why wouldn't they put out a complete list of their powders?

All of the MP powders are numbered by deceasing burn rate so just find the closest number and it will be close (especially for their slow powders). I would pick the faster powder data to start but you always have to slowly work up. I consider a chronograph is required for any of them and especially if you use another cartridge not listed. i have many of their powders and they work as advertised but they are not for beginning reloaders.

[Jeff Michel]

Delkal has just given you excellent advise. If you don't have a chronograph, get one. If your new to reloading or uncertain, best to avoid powders such as these and rely on published data for canister powders. When dealing with surplus or pull down powders, it's important to remember, similar to is not same as.