Originally Posted by mtbfarms
There is a powder chamber that is larger than the bore.
I have some h1000 on order. It tested about the same pressure as retumbo with a little higher velocity.
Do you know the dimensions of the chamber, or at least how much Retumbo powder it holds?
Is there a bullet stop above the chamber so it does not need to be 100% fill or do you always go for 100%?
Someone more knowledgeable than I could probably run Quickload if they knew the dimensions and get a good list of powders.
Mind sharing the charge you are currently using, and the measured pressure?
The more info known the better the prediction with something like quickload.
PS as I mentioned above, a 60fps variance if accurate is not anything to worry about...IMO.