Good heavans. Are you really going to risk injury or damage to one of your guns for $60.00 of powder? You made a mistake. Learn from it, do not take a risk of major injury. You need to know that what you are loading is safe to shoot. Without decent pressure readings of your loads, with a two powder mixture, you are a walking range safety problem. Putting yourself and those around you at risk.
Now if you are still willing to run the risk, then use your brain. Load five or ten shells up, with the mixutre, and have them pressure tested. It is not that hard to do and it does not cost that much. And if you are going to shoot around others you ought to do it for their safety as well as yours. If the load comes back at safe pressures then you know that you are OK. If it comes back too high you saved your gun and body.
