Can we have a hollow point expansion picture thread?

[Michael J. Spangler]

Bringing this thread back from the dead.
This is MP 359-640 160 grain penta pin. Fired in a 1 7/8” barrel. A 4” barrel and an 18” barrel.
Alloy was pure with about 1.5% tin if I remember correctly.

[bld451]

MP 235 gr HP at 1050. 8.5" blackout in 10% gel. 50/50 pure/WW. Modified (longer hp on right.

[bld451]

Mp 311-140 at about 2000 from same 8.5" blackout. Small hp pins. Seated out to crimp just on the forward end of the grease groove. Feeds great and about 2-3" groups at 100.

[Michael J. Spangler]

MP 460-420

First one is the cup point loaded fast. Second is the penta loaded slow.
Great weight retention. It seems the cavity design/speed matters a lot more than the alloy.

[Michael J. Spangler]

MP 359-125 with the penta pins. Sport pistol powder.
CZ P-01 Omega.

Bullet shown beside a 147 HST for comparison.
Only 10” of penetration in bare gel but super consistent from shot to shot. I’m thinking if I slow this down a bit or maybe try the same alloy with the regular round hollow point it might slow down the expansion and get better penetration.

I have to compare the hollow point pins though because the round is very similar size. I’m guessing the round expands a little slower than the penta due to not having the sharp corners that turn into petals.

Oh and retained weight was virtually 100%.
I didn’t weight this alloy before shooting but the harder alloy was about 129 grains. This being softer I figured it’s a few grains heavier. The recovered mushrooms weight 129.5 average. Close enough.