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300 Whisper / 300 Blackout

Dead Eye Dick

Command Spec 4 (formally known as Wiillk)
Full Member
Minuteman
Supporter
May 18, 2020
4,884
15,763
North Louisiana
Had a reloading session from hell yesterday. If it could go wrong, break, get stuck...IT DID! (Took two hours to load 23 rounds on a progressive press. Supposed to be 24 but part of a case is still stuck in a reloading die)

Anyway, I learned something yesterday afternoon. We always considered the Blackout/Whisper to be the same and essentially they are. However, be warned. The older 300 Whisper / 300/221 form/trim dies are built for the old standard of 1.400 inches of case length. These will not chamber in a 300 Blackout rifle. (Which requires a case length of 1.368.)

Found this out after my jury rigged case trimmer was irreparably damaged with about 3 cases left to trim. So, I dug out my case form/trim die. No amount of adjusting would allow the shell holder to trim the cases below the 1.400 inch length. (That is short of sending it all out to a machine shop to have the bottom of the die trimmed.).
 
Had a reloading session from hell yesterday. If it could go wrong, break, get stuck...IT DID! (Took two hours to load 23 rounds on a progressive press. Supposed to be 24 but part of a case is still stuck in a reloading die)

Anyway, I learned something yesterday afternoon. We always considered the Blackout/Whisper to be the same and essentially they are. However, be warned. The older 300 Whisper / 300/221 form/trim dies are built for the old standard of 1.400 inches of case length. These will not chamber in a 300 Blackout rifle. (Which requires a case length of 1.368.)

Found this out after my jury rigged case trimmer was irreparably damaged with about 3 cases left to trim. So, I dug out my case form/trim die. No amount of adjusting would allow the shell holder to trim the cases below the 1.400 inch length. (That is short of sending it all out to a machine shop to have the bottom of the die trimmed.).
Anyone with a lathe and carbide tooling can trim that die in about 5 mins. Surely you know someone local to you who has a lathe, right?
 
Anyone with a lathe and carbide tooling can trim that die in about 5 mins. Surely you know someone local to you who has a lathe, right?
The closest machine shop that takes in outside work is an hour away, and no one local that I am aware of has a lathe. Getting simple services is quire difficult in this part of North Louisiana. We are a touch rural.
 
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