H450 280 Ackley

[letrbuck]

I know this powder has been discontinued for a while, but was given a pound and figured it'd be good for fireforming some virgin brass before doing some other load development.

I've only been able to find some 270 WIN data, but looks like I'll be pretty safe with 55-57gr for 150s?

Figured someone on here might have used it in a 280AI before it went away...

 

[Darryle]

Here's what I was able to find

 

[243winxb]

The Speer #8 has standard 280 data. NOT AL.

Problem is, # 8 manual has many over pressure loadings.

Another problem is H450, was discontinued for a reason.

Unless you have tested data from a great source, scrap H450.

 

[cape cove]

From my experience H 450 was a very good old powder. The best I have ever used in my 270 Weatherby with 130/150 gr bullets in terms of velocity and accuracy and suitable where ever one would use H 4831/IMR7828. One of the reasons it was discontinued was the large lot to lot varation. I had one lot that was 5grs slower than the previous lot I had been using. Luck for me I went from fast to slow. JME

 

[Gary in MD]

Plenty of data around in the older manuals.
It worked very well in magnum cases, it is very close to the burn rate of H4831. I used it years ago in some accurate loads in the 240 Wby, 270 Wby, and the 264 Win.

 

[Mike Matteson]

My Nosler reloading manual printed in 1976 show only 280 Rem loads. H450 powder. See attached, and that should get you petty close. As I have stated before never through out your old reloading manuals.

 

[Ardon]

From my experience H 450 was a very good old powder. The best I have ever used in my 270 Weatherby with 130/150 gr bullets in terms of velocity and accuracy and suitable where ever one would use H 4831/IMR7828. One of the reasons it was discontinued was the large lot to lot varation. I had one lot that was 5grs slower than the previous lot I had been using. Luck for me I went from fast to slow. JME

You wouldn't by any chance remember what those loads were do you? If so, could you please post them. Normal disclaimers apply. Thanks

 

[cape cove]

Bullets used were the 130 gr Hornady Interlock Spt and the 150 gr Hornady Interlock, cases were Weatherby. With my slow lot of H-450 with the 130 gr I used 78 grs of H- 450 with a Rem 91/2 M., with an oal of 3.300. Velocity was 3327 ft/sec with sub MOA accuracy. With the faster lot I had I used 73 grs of H-450 with the same components.
With the 150 gr Hornady I only tested with the slow lot . I used 73.5 gr H-450 with a Fed 215 and an oal of 3.295. Velocity was close to 3200 ft/sec and accuracy was .8 MOA. These velocity #'s are from my 24" barrel. These are max safe loads in my rifle with the powder lot's used. Back off 10% and work up. We are talking about a 270 Weatherby magnum.

 

[Ardon]

Bullets used were the 130 gr Hornady Interlock Spt and the 150 gr Hornady Interlock, cases were Weatherby. With my slow lot of H-450 with the 130 gr I used 78 grs of H- 450 with a Rem 91/2 M., with an oal of 3.300. Velocity was 3327 ft/sec with sub MOA accuracy. With the faster lot I had I used 73 grs of H-450 with the same components.
With the 150 gr Hornady I only tested with the slow lot . I used 73.5 gr H-450 with a Fed 215 and an oal of 3.295. Velocity was close to 3200 ft/sec and accuracy was .8 MOA. These velocity #'s are from my 24" barrel. These are max safe loads in my rifle with the powder lot's used. Back off 10% and work up. We are talking about a 270 Weatherby magnum.

Thanks for the info. I have some H-450 and will try it in my 270 Weatherby.