HS-7 burn rate

Stats Shooter · September 10, 2018, 08:00 PM

I have some Oregon trail LFN 10mm 180 gr bullets and down loaded their load data manual. They list HS-7 a lot and I was wondering, from those who used it, what powder is most comparable?

For my full throttle 10mm loads I use Long shot and I have some on hand. I guess I'm asking if long shot is similar to HS-7? Or if not, what would be similar in burn rate?

Pathfinder45 · September 10, 2018, 09:01 PM

HS-7 is a powder that has been discontinued a few years ago. Which is too bad, as it is an excellent powder that is well suited to maximum loads in 45 Colt standard pressure loadings. I have read that it is the same, identical powder as W-571; which I am strongly inclined to believe, since I have both and they look alike, meter alike and give me the exact same results in 45 Colt. AA-7 is NOT the same; being somewhat slower burning, I find it to be an acceptable substitute, though the load data is different.

Stats Shooter · September 10, 2018, 09:18 PM

Quote:

I have read that it is the same, identical powder as W-571;

I assume you mean Win 572?

Pathfinder45 · September 10, 2018, 09:43 PM

Not at all. I believe W-572 is a new powder, Where as, W-571 is discontinued.

Stats Shooter · September 10, 2018, 09:45 PM

well darn . Ok so I guess I will just to a standard load workup

BillM · September 10, 2018, 10:04 PM

I talked to Hodgdon when they discontinued HS-7 and was told that the new powder
for that application was going to be Longshot. I did do some load workup with Longshot,
and it starting showing pressure before I got to HS-7 velocities. Did get the velocity I needed out of 572---but didn't see any advantage over my current HS-6 load.

Dufus · September 10, 2018, 10:37 PM

From an old Western Powders burn rate chart (V3.4) dated 08/06/2013:

HS-7 is equivalent to Alliant Steel
HS-7 is equivalent to WW571
HS-7 is equivalent to VV N-105

Another chart lists:
47. VV N350
48. HS-7
49. VV 3N38
50. Alliant Blue dot

Longshot was listed at #53.

USSR · September 11, 2018, 05:53 AM

HS-7 is not "equivalent" to W571, it IS W571 packaged as a Hodgdon powder (Hodgdon has personally never manufactured a powder). Both came out of the St. Mark's Powder Plant in Florida, and both are no longer made. Other Hodgdon powders that are repackaged Winchester (St. Mark's) powders are: HS-6 is W540 and HP-38 is W231.

Don

jmorris · September 11, 2018, 08:36 AM

I wouldn’t go with “similar” just find other load data with a different powder. Your “hotter” loads will be with slower powders to the point you can’t put enough into the case.

It’s been more than a decade since they quit selling HS-7, on my wall of powder it’s past (slower than) CFE pistol, Silhouette and 3N37 but before (faster than) blue dot, longshot and 2400.

Stats Shooter · September 11, 2018, 08:44 AM

Thanks for the good info fellas. I think I will just try something else. It appears longshot is too slow for lead bullets in 10mm. Plus I have found it performed best when pushed near max. (more consistent velocity and very clean)

September 10, 2018, 08:00 PM	#1
Stats Shooter Senior Member Join Date: August 26, 2016 Location: North Dakota Posts: 1,636	HS-7 burn rate I have some Oregon trail LFN 10mm 180 gr bullets and down loaded their load data manual. They list HS-7 a lot and I was wondering, from those who used it, what powder is most comparable? For my full throttle 10mm loads I use Long shot and I have some on hand. I guess I'm asking if long shot is similar to HS-7? Or if not, what would be similar in burn rate?

September 11, 2018, 05:53 AM	#8
USSR Senior Member Join Date: November 14, 2017 Location: Finger Lakes Region of NY Posts: 1,442	HS-7 is not "equivalent" to W571, it IS W571 packaged as a Hodgdon powder (Hodgdon has personally never manufactured a powder). Both came out of the St. Mark's Powder Plant in Florida, and both are no longer made. Other Hodgdon powders that are repackaged Winchester (St. Mark's) powders are: HS-6 is W540 and HP-38 is W231. Don __________________ NRA Life Member NRA Certified Metallic Cartridge Reloading Instructor

September 10, 2018, 09:01 PM	#2
Pathfinder45 Senior Member Join Date: January 7, 2008 Posts: 3,224	HS-7 is a powder that has been discontinued a few years ago. Which is too bad, as it is an excellent powder that is well suited to maximum loads in 45 Colt standard pressure loadings. I have read that it is the same, identical powder as W-571; which I am strongly inclined to believe, since I have both and they look alike, meter alike and give me the exact same results in 45 Colt. AA-7 is NOT the same; being somewhat slower burning, I find it to be an acceptable substitute, though the load data is different.

September 10, 2018, 09:43 PM	#4
Pathfinder45 Senior Member Join Date: January 7, 2008 Posts: 3,224	Not at all. I believe W-572 is a new powder, Where as, W-571 is discontinued.

September 10, 2018, 09:45 PM	#5
Stats Shooter Senior Member Join Date: August 26, 2016 Location: North Dakota Posts: 1,636	well darn . Ok so I guess I will just to a standard load workup

September 10, 2018, 10:04 PM	#6
BillM Senior Member Join Date: January 20, 2009 Location: Amity Oregon Posts: 791	I talked to Hodgdon when they discontinued HS-7 and was told that the new powder for that application was going to be Longshot. I did do some load workup with Longshot, and it starting showing pressure before I got to HS-7 velocities. Did get the velocity I needed out of 572---but didn't see any advantage over my current HS-6 load.

September 10, 2018, 10:37 PM	#7
Dufus Senior Member Join Date: December 10, 2014 Posts: 1,965	From an old Western Powders burn rate chart (V3.4) dated 08/06/2013: HS-7 is equivalent to Alliant Steel HS-7 is equivalent to WW571 HS-7 is equivalent to VV N-105 Another chart lists: 47. VV N350 48. HS-7 49. VV 3N38 50. Alliant Blue dot Longshot was listed at #53.

September 11, 2018, 08:36 AM	#9
jmorris Senior Member Join Date: November 22, 2006 Posts: 3,077	I wouldn’t go with “similar” just find other load data with a different powder. Your “hotter” loads will be with slower powders to the point you can’t put enough into the case. It’s been more than a decade since they quit selling HS-7, on my wall of powder it’s past (slower than) CFE pistol, Silhouette and 3N37 but before (faster than) blue dot, longshot and 2400.

September 11, 2018, 08:44 AM	#10
Stats Shooter Senior Member Join Date: August 26, 2016 Location: North Dakota Posts: 1,636	Thanks for the good info fellas. I think I will just try something else. It appears longshot is too slow for lead bullets in 10mm. Plus I have found it performed best when pushed near max. (more consistent velocity and very clean)