Superformance powder & .243 WIN 100/105 gr bullets?

[mikgarus]

Superformance powder & .243 WIN 100/105 gr bullets?
Anybody tried it?

[darkker]

I may have a book with data at home, will look tonight.
Superformance doesn't act like a "regular" powder. It is a very progressive burner, and the curve changes significantly with operating pressure.

I'll let you know if I can come up with something tonight.

[mikgarus]

Thanks. Appreciate it. The heaviest bullet Hodgdon lists for this powder is 80 grs. My Hornady manual is old and doesn't list Superformance at all, don't know about the latest version.

[darkker]

What "Hodgdon doesn't know" could fill a great many books....
Sorry newest Hornady doesn't have it, they are a good resource....
If you can catch Emary, he may well be able to help you. He was a main powder monkey at General Dynamics before coming to Hornady. So understanding powders he built really shouldn't be a surprise.

[243LPR]

I have had some good accuracy with it but is a very dirty powder,like an ash in the barrel. Used in 243AI and 6mmAI. The Hornady 9th edition lists 39.7-44.4 grains w/Fed 210 primer.

[mikgarus]

The Hornady 9th edition lists 39.7-44.4 grains w/Fed 210 primer
Is that for a 100 gr bullet?

[darkker]

it but is a very dirty powder,like an ash in the barrel. .

Yes, you get your choice in fouling. Clean looking, but building hard carbon fouling, as found in the Extreme series. Or ashy-looking that is easily removed.

[243LPR]

Thats for 95-100 gr bullets.

[mikgarus]

Thats for 95-100 gr bullets.
Thank you Sir!

[WinnieTheBoom]

Isn't the .243 known for random pressure spikes anyway? Specifically based on seating depth? I'd stay away from SP for that reason alone...

I guess I don't see any reason to use anything other than H4350 since I've had such good luck with mine :p

[mikgarus]

Isn't the .243 known for random pressure spikes anyway? Specifically based on seating depth? I'd stay away from SP for that reason alone...

I guess I don't see any reason to use anything other than H4350 since I've had such good luck with mine :p
I haven't seen any H4350 in over a year, anyway it was never a powder I really liked. I've had better luck with RL19, H4831sc & H414 for 85/87 bullets.

[mikgarus]

New Barnes manual lists 41 Min / 45.5 Max for 105 gr bullet. It seems we might start getting more info on this powder.

[deerhunter99]

My son and I have worked with it a lot, we have never seen anything superformance about it !!! :o

[Fla_dogman]

I load 100gr sierra gamekings in front of 42gr (I think) of IMR 4350 and shoot sub MOA with my Savage 243 from a bench. It works well on deer and hogs here.

[Fla_dogman]

Oops sorry I didn't realize you were asking about a specific powder.

[243LPR]

New Barnes manual lists 41 Min / 45.5 Max for 105 gr bullet. It seems we might start getting more info on this powder.
That's with a solid copper bullet though,correct? Regular cup n' core run different pressures.

[mikgarus]

That's for their Match Burner bullets which I think are regular HPBT match.
http://www.barnesbullets.com/files/2014/11/243WinchesterV4BRM5.pdf