I found a few pounds of 7828ssc which I've ordered (can't find regular in stock). My current load uses regular 7828 and I've got about two pounds left from about 2002. Since I'm changing from Partitions to A-Frames I figured I'd give ssc a shot. From my reading, it looks like the same data applies and it should be treated like a different lot of powder and I need to back off a little from my max load.

I'm looking for anybody's experience in differences between the two. Has anyone got experience with the two side by side?

I have no experience with either however everything I've read sez WEIGHT for WEIGHT they are equal.

I have found them to shoot the same.

Both good powders you get little better load density with IMR-7828ssc.

I have shot many rounds with both, always used the same load and got same results. I was so pleased I got two 8 pound containers (same lot) of the SSC and have enough excellent powder to last a long time. Good shooting.

I have used them side by side and they were the same. I like the ssc as it has a better load density and I can get more in the case easier

Matthew

They will not be "the same" since any two lots of any powder can be different. Start a grain or two lower whenever changing lots - or these two powders - if you load up near the top end. Just saying....



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Thanks for the feedback everyone.

Well I guess I'm the odd man here. I use 7828 in my 30-06 AI. Accuracy is outstanding with 180gr Partitions.

My load is heavily compressed. Because of this I bought a pound of SSC to see if it reduced some of the compression. It did, but it also shoots like shit. Burned up the whole pound and never did get an acceptable load. Switched back the 7828 and all is well. YMMV

quote:

Originally posted by steve4102:
Well I guess I'm the odd man here. I use 7828 in my 30-06 AI. Accuracy is outstanding with 180gr Partitions.

My load is heavily compressed. Because of this I bought a pound of SSC to see if it reduced some of the compression. It did, but it also shoots like shit. Burned up the whole pound and never did get an acceptable load. Switched back the 7828 and all is well. YMMV

The difference may not be so much in the powders but in the compression. Compressing a powder tends to give you more consistent ignition and velocities, particularly when the powder is on the slow side compared to the capacity of the case, as it would be with the .30-06 AI and 7828. The uncompressed 7828 might give you less consistent ignition, wider variation in pressure and velocity, and therefore less consistent accuracy.

If the cartridge had been, say, a .300 Winchester, then you might have noticed no difference.

Just goes to show that changing any component, even theoretically equivalent ones, can alter the performance of a load.

Good point on the compression. I don't recall how compressed my .264 is with regular 7828. I'll have to take another look. That could certainly make a difference though.

quote:

Originally posted by parshal:
Good point on the compression. I don't recall how compressed my .264 is with regular 7828. I'll have to take another look. That could certainly make a difference though.

IMR 7828, despite being a relatively slow powder, is still on the "fast" side for the .264 WM. Unless you are shooting a very light-for-caliber bullet then a maximum charge of IMR-7828 in either regular or SSC won't fill the case enough to be compressed.

It's a 140 gr bullet with 64 grains.