Went out today to look at the ballistics on the Magtech First Defense .380 rounds. First is the data that Magtech lists on their web site.
Muzzle velocity 1099 fps, muzzle energy 207 ft. lbs.
This is not what I got using my Bersa Thunder.
Muzzle velocity ranged from 962 to 992 fps, with an average of 981 in 7 rounds from the standard clip on the thunder. The speeds were 992, 989, 982, 962, 991, 977, 974 in that order.
That equates to an average muzzle energy for a 77 grain bullet of about 165 ft. lbs, some 21% less than what the manufacturers web site states.
I have never had any feed problems from these rounds, they have always been reliable.
They went through 3 two litre bottles of water and penetrated into the 4th where they could be retrieved. There was very little expansion of the head of the bullet. I am guessing that if I had taken the time to make a wet pack of paper I would have seen some expansion. Below is a picture of the two rounds that went into the water.
Based on this info, I think I will go and pick up some corbon dpx, and run some tests on them. From what I have seen by others they should be a bit closer to the manufacturers specs. If they are, they will definately become the round that will be in the clip in the future.