Originally Posted by Sparkiewalt
If I have been using H4831, would the H4831SC shoot about the same? Also the SC does not show up on any of my charts. Should I use the same grains as the H4831?
Yes, data for H4831 is useable for H4831SC as well. As with any load, start at the published minimum and work up from there.
SC will perform nearly identical to 4831, but it might be slightly different in a particular cartridge so you'll need to re-work your loads. The charge might wind up the same or it might be slightly different.
Just don't jump right in with your current H4831 recipes and expect the same results. Always back off the charge and work up just to be safe.
H4831SC is still and extruded powder like H4831, but the grains are much shorter (about the same length as they are in diameter). That's why it meters so much better though a measure than the original H4831.
I agree with Josh, for the three cartridges you listed, H4831 or H4831SC are excellent choices for a compromise powder.
Reloader-22 is another powder that is very close in burn rate to the 4831s and might be a good all-purpose choice too.
H4831SC and Reloder-22 are my two favorites for the .270.
I've had very good luck with Reloader-22 in the 7mmRemMag, but H4831 works in it as well.
H1000 is quite a bit slower burning than 4831. It's closer to Reloder-25 in burn rate & performance.
It's still an extruded powder so it doesn't meter any better than H4831.
It's borderline on too slow for the .270, good for heavy bullet weights in the 7mmRemMag, and I can't say for sure about the .270WSM since I don't load it.