Each 24-26 had a clean extraction, and 27 held the bolt open using the carrier (not full back on the bolt lugs). I didnt chrono these, just looking for bolt hold open on an empty mag. I loaded a single round each of 24, 25, 26, and 27 (which should be very close to case capacity of 1680). I got to shoot some more today, none at 100 yards yet, so I was just looking for ability to cycle and some points on FPS. The first two essentially hit the same hole. I started with a clean bore and did not use a fouler shot.Ģ: 943 - no extraction, bolt full forwardģ: 943 - no extraction, bolt full forward I fired three groups of three: 21, 22, and 23 grains 1680 after my very first shot at 19gr gave me 807 FPS. I am extremely new to casting and powder coating, so I can say for certain there are probably other factors I left out such as water quenching, age hardening etc. They were powder coated using standard methods and measured at. 451 left a small extruded ring of lead at the base. I wiped off the lube and had to mildly sand the bullet base as going from. The sizing process required a layer of Hornady Unique lube, and did require some force. 451 sizer die, so I elected to size first, then powder coat. I am not set up to use a side-crimp, however, I bet it would be extremely useful here.įinished bullet double.jpg (107.52 KiB) Viewed 15972 times Seating any deeper will further reduce the effectiveness of the crimp. This bullet requires you to have a magazine that will allow for an COAL of 2.3". 470" and was still not a great grip on the bullet. 474", however, I believe these were crimped to. This also does not allow us to get a very good taper crimp as the case mouth with the bullet seated at 2.3 is not on a portion of the bullet that measures at. Seating depth is required to be long due to the very narrow taper of this bullet, which is designed for the 45/70. Case mouths required a good bit of flare. Loaded to 2.3 in twice fired Starline brass. 451 bore size)ĭropped at 490 grains with straight wheel weights, air cooled. That being said, I've got my steel toe boots on, let's go bowling!ġ8" AR15 GLFA barrel, mid gas, 1:24 twist, (90% confident of a. Through seemingly endless internet searching, I could not find a single source document or forum about shooting heavy bullets in the 450BM that didn't end in "The 450BM was designed for lighter, faster loads" which always seemed to be a conversation killer. Having fired everything between 230-300 grain in my 450BM, I figured it was time to try out what the SOCOM fanboys are always raving about. Or continue below to see my trial, error, and eventual success. Skip to page 4 and beyond for a bullet that actual works, the Lee C457-500. 9MAR21 EDIT: Everything below until the middle of page 4 I will leave for educational or nostalgic reasons, however, the Lee 459-500 bullet is NOT good for the 450 Bushmaster.
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