I don't like to bond the cores for the 45apc. But I'm also making hp's.
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I made those using a 40s&w brass and a cast 148gr hbwc for a core. I use a 44mag expander to expand the 40s&w brass then drop a 148gr hbwc in the expanded 40s&w case. Then I run the case/core up into a hornady blank die to put the xtp pleats on the nose of the bullet. Then I run the partially formed bullet up in a 243 fl die to form the bullet. Then a trip thru a lee push thru die to make sure of the final size,.451". A spin off of that bullet. Glow in the dark airsoft bb's in the nose of the hp. That bb drives straight back and the hp bullets explode when they hit something.
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The end result is a 225gr hp for the 45acp that frags/implodes. There's 2 trains of thought and most people want a hp or bullet to stay together and look pretty. Myself, I want a bullet to function at extremely high levels when being used for it's intended purpose. The bullets pictured above recovered from bundles of wet newsprint. The bullets left half dollar sized permanent holes in the wetpack and penetrated 7/12" to out the back of the 9" bundle. Shot offhand @50ft over a chronograph.
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I make wetpack bundles by taping bundles of newspaper together (9"/10"/12"/etc) and put them in a 48qt cooler. Then I fill the cooler with water and let it sit overnight. After 4 or 5 hours I add more water water. I take the cooler full of wetpack to the range and take bundles out as needed and set them up and staple targets to them and test bullets/loads. They say 12" of wetpack is equal to 18" of ballistics gel. I don't know about all that. But I have tested some factory ammo and it came pretty close to the 12" ='s 18" of gel.
Years ago I did testing with bonding vs not bonding. I found you don't need to bond cores but you need to pay attention to the alloy you use for the cores. Along with getting a tight fit between the jacket and core if you want the bullets to stay intact. The core used for these 44mag 265gr hp's was a 210hbwc cast out of 8bhn alloy.
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It took awhile to get a hp design (small pleat's) that would stay intact. I wanted these for deer hunting and the target zone was 1200fps hit @ 75yds to 100yds.
Testing was done in wetpack @ 25yds simulating the velocity of a hunting load/100yd hit.
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The hbwc's I cast have 2 grease grooves in them. Those same grease grooves are the 2 crimp grooves in the 44cal bullet pictured above.
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Anyway, get your core tight and you don't have to worry about bonding cores to the cases/jackets.
And yes I do make 35cal thumpers out of 9mm & 380auto cases.
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Too much fun!!!