I think I started using BL-C2 way back in the early 80's somewhere. Mainly in the .22-250. It's excellent powder, no doubt about it.
As previously mentioned though, it's a ball powder that's harder to ignite, it's dirty burning stuff, and it is temperature sensitive. All that being as it may, I still use it in several rounds.
I always have a can of it on hand, and it works very well besides all the other issues. It meters like water. I use H414, H380, and H335 as well. They suffer from similar maladies.
Nowadays, with newer powders available which don't have the issues previously mentioned, I still use it from time to time anyway. Just not as much.
Steve...
What did you mean by losing accuracy "at or around the 100yd. mark" ?
Maybe I misunderstood you but once the bullet is in flight, and unless it's acted upon by another force (wind, twig or grass, etc.) it's pretty much gonna stay on track.
That's also providing that it's well stabilized by the rifling. All else being equal, accuracy at 50yds., correlates to accuracy at 100, 200 & on out. Technically, in a perfect world (no crosswinds), 1" at 100yds. equates to 2" at 200, etc. With shooter error, this is always an issue/problem, but again, unless I misunderstood you, once in flight it should be pretty much a standard figure on out.
At the bench right now I'm working on another load in my .22-250 that's shooting at aprox. .300" for five rounds. On a calm evening, and if I can keep the shooter error at bay, it'll shoot 5/8-3/4" at 200yds. Which pretty much figures accordingly.
Just wondering ?
Take care,
Bob