7 Sherman short fireforming loads?

[Winny94]

Anyone have any fireforming loads for headstamped ADG brass, h1000 & 175-180gr class of bullets?

 

[ShootDots]

There is a thread on here about the 7 Sherman Short, however, it was formed with SAUM brass. I can't remember if it was from Norma or ADG brass. But he loaded 55.0grs of RL-23 with the Berger 184. I have 32 loaded with the ADG 7 Sherman headstamp on it. I am going to use 56.0grs of IMR 7828ssc. IMR 7828ssc is noticeably faster than H1000. I am NOT CERTAIN you would get enough powder in there of H1000 to get a GOOD fireformed piece of brass. If possible, use a faster powder. If you happen to have H4831sc, I would rather use it. I believe you could use either 55.0 or 55.5 JUDGING from the thread where the OP used 55.0grs of RL-23 successfully.

 

[Winny94]

There is a thread on here about the 7 Sherman Short, however, it was formed with SAUM brass. I can't remember if it was from Norma or ADG brass. But he loaded 55.0grs of RL-23 with the Berger 184. I have 32 loaded with the ADG 7 Sherman headstamp on it. I am going to use 56.0grs of IMR 7828ssc. IMR 7828ssc is noticeably faster than H1000. I am NOT CERTAIN you would get enough powder in there of H1000 to get a GOOD fireformed piece of brass. If possible, use a faster powder. If you happen to have H4831sc, I would rather use it. I believe you could use either 55.0 or 55.5 JUDGING from the thread where the OP used 55.0grs of RL-23 successfully.

Interesting. For fireforming I have no problem buying a pound of something else. Not sure I understand your post though - are you using 7828 because it's what you have or because it's superior to 4831for this purpose?

 

[ShootDots]

Interesting. For fireforming I have no problem buying a pound of something else. Not sure I understand your post though - are you using 7828 because it's what you have or because it's superior to 4831for this purpose?

It is close enough in burn rate to H4831sc that I should be able to get excellent fireformed brass. I have almost 24pounds of it! That is the main reason..

 

[Winny94]

It is close enough in burn rate to H4831sc that I should be able to get excellent fireformed brass. I have almost 24pounds of it! That is the main reason..

Understood, thanks. So your reference to 55-55.5 grains is for the 4831, correct?
Also, do you recommend jamming?

 

[ShootDots]

Understood, thanks. So your reference to 55-55.5 grains is for the 4831, correct?
Also, do you recommend jamming?

Extrapolating from that other thread, 55.0grs of H4831sc should be plenty. And whenever you fireform to something different than the original case, as in making an Ackley or a Dasher from BR brass, ALWAYS jam the bullet. That forces the case head against the bolt face. That allows for a more complete "filling of the chamber" with the case and less likely chance of a misfire..