Was loading for a Ruger #1 rifle in 7x57. I had developed a great load with the 160 grain Partition, using Norma MRP.
Accidentally got a R-P case mixed up in my Winchester brass, and failed to notice the powder level in that R-P case.
I was chronographing the load to verify previous results, and was getting low 2700 fps readings until I fired that R-P case.
Chronograph read mid 2900's, and some smoke curled out of that #1 action. Lever drop was a bit sticky, and the primer immediately fell out
of the badly expanded case.
Checking case capacities later told the story. The R-P cases were about 30 grains heavier than the WW-Super cases.
No harm to anything but my ego, lol. Lesson learned -----watch those cases, and avoid mixing brands.
Another boo-boo on my part was thinking that I could successfully use Hornady 50 grain SX bullets at full speed in my 220 Swift.
No harm, of course, but only about 2-3 out of 5 shots reached the 100 yard target, the others disappeared in a grey mist out 50 ft in front of the muzzle.
Regards, Dave.