I loaded the "Slippery" coated bullets 78 grain .313 flat point over 3.0 gr. of Auto Comp during the bad weather and finally got to the range to test them. I resized the bullets to .311. Although they say that they weigh 78 gr. they actually weigh 80 grains.
Tested for accuracy at 20 yards using a CZ-70 they shot a nice round two-inch group. They chronographed 1088 fps, 53 ES and 16 SD from the 8 shots fired. I say 3.0 grains of Auto comp using a "0" Little Dandy rotor, but sometimes my scale says 3.1. They felt hot but the brass didn't show any obvious signs of impending peril except the CZ through the cases very far away. Farther than usual.
They are seated too deep. I have 10 or so left so I'll shoot them in a .327 revolver. Next batch I'll expose the crimp groove and catch two bands and seat them as far as possible to still load in a 32-auto magazine. Hopefully seating them farther out will reduce that 1088 fps velocity down some along with any excess pressure. I wouldn't dare shoot these in my Tomcat Inox. I probably should try the "00" rotor next as the auto comp powder in the 32 seems to have decent extreme spread over other usual 32 auto powders. The same coated flat point 80 grain bullet over 2.2 grains of Bullseye registered 906-35-12 from the CZ and was very accurate. The 71 gr. Berry's over 2.2 grains of Bullseye registered 846-68-20 from the CZ. It is odd how the 71-grain plated bullet was so much slower than the 80-gr flat point coated lead bullet with the same 2.2 Bullseye load in the same barrel (CZ-70)
I then fired the 71 fmj Berry's over the same 3.0 auto comp and they chronographed 982-57-19. from the CZ-70. So, the 3.0 auto comp load is euro spec, but I suspect a regular FMJ would be slower than these plated Berry's.
For what it is worth the surplus 73 gr. S&B steel core in the in the Tomcat Inox registered 932-78-28. The Fiocchi 73 grain purported 1000 fps load registered 913-122-34 from the Tomcat Inox. The 71 gr. Berry's over 2.2 gr. of Bullseye registered 713-64-18 from the Tomcat.
Here are those 32 bullets from "Slippery"
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