Thread: Burn rate / velocity / pressure / accuracy

You will have to do load development again.
I would start with the same COAL that worked with the other powder and go from there. You could try to aim for a similar velocity and see if it works out, it may or it may not, but obviously work up to it and start at the recommended starting load for that powder / projectile weight, just to be safe.
There really isnt any reason to think much about burn rates. Its sort of just useless information IMO. Unless you get down to a barrel thats only a few inches long, the powder that provides the most velocity in a long barrel will also provide the most velocity in a short barrel.