My 10mm cast & powdercoated bullets and load

[Teninator]

This is from the Accurate Molds 160-BG mold. But with powdercoating and copper check, it is about 187gr with wheelweight.







With 9.9gr Blue Dot shot out of a 16" PCC I get ~1368-1343.

I wonder how much higher I can go. No signs of pressure clearly less boom than my various 165 and 180 FMJ loads. But there is so little data for 190gr boolits.

Lyman Cast Bullet Handbook lists 10.3gr Blue Dot max for 180gr, and 9.6gr max for 200gr cast bullet, so I took the average and went 9.9.

The only 190gr data I've seen is in the Lee manual, Accurate #7 10.1 starting 11.2 max.

[Kenk]

Nice, been reloading for some time, but am still pretty green when it comes to casting and powder coating, but it?s coming along. Between  Blue Dots report, fireball, and accuracy on certain loads, it?s a great powder choice

[tommac919]

"Lyman Cast Bullet Handbook lists 10.3gr Blue Dot max for 180gr, and 9.6gr max for 200gr cast bullet, so I took the average and went 9.9."

I've run up to 10.4 BD with the 200gr xtp and know others that have gone higher ( G20/Sig 220/10 )... so I think you can go a bit higher than 9.9 too. ( mind that xtp is copper clad )

BUT, only testing a small amount at a time will really tell in yr gun, also bullet type makes a difference.

PS... pretty bullets.  If I was coating, my loads would have their own color for quick info 

[sqlbullet]

Also, be aware that one of the reasons Alliant stopped at what seems like a "lower" pressure load is that Blue Dot can be temperature sensitive.  If you exceed the max, always shoot those loads in the same temp range you worked up the load.

[Kenk]

I?ve read about that too, had always been in the back of my mind when shooting in subzero MN weather

[blaster]

Kenek- i have considered it too.  down here in with an air temp of 90+ degrees. a max load can REALLY become MAX quick! especially when the gun/ammo has been sitting in a hot closed up vehicle!

[Kenk]

Kinda scary stuff. I haven?t looked into this yet, but do any of the other powder options create pressure spikes in hot or cold conditions?

[tommac919]

Others have noted , BD is an old school powder, so it gives a very traditional response at extreme temps. That means it goes up at hot and down at cold temperatures.

good article re powder and temps
https://www.ballisticproducts.com/bpi/articleindex/articles/curmudgeon_articles/060329_hotcoldpowder.htm

[Kenk]

Thank you, this article was very helpful

[sqlbullet]

yep.  To be safe, develop your over-max loads on the hottest day of the summer and shoot them in the winter!

[Kenk]

Lol, that was kind of my thought as well