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Measureing the Lyman bullet 358311, it is .0754 long.
The Lee TL-358-158-SWC is .0665 long.
From the base of both bullets to the front driving band is .0427, -+ .02,
the difference in lenght is .089, the Lyman being longer.
So both bullets would have to be set back in the case the same?
I set the Lee bullet just back far enough in the case to clear the rifling in the 75 CZ, this is were I got the OAL.
I will not shoot these rounds, however I wonder how many guys in the early years ( before Lyman dropped the load data for this bullet) had problems, this is very interesting indeed!!
Yes, the base of either bullet would be seated to the same depth inside the case, but the Lyman would be at a longer OAL.
If you want to shoot heavies in the 9mm, get something you can load closer to the max OAL to get the most case volume you can. Or ream your chamber throat to allow you to seat this bullet further out.
rc,
Altho the bullet profiles are different, the distance from the rear of the bullets and the front driving bands are the same, hench the 358311 Lyman bullet would still be a problem in the short leade CZ.
Thanks, Floyd
That is probably why I had no problems with my H&G 158 RN in the 9 MM. Bullet OAL is .700 and base to the front drive band is .374. At the time I worked up my load I had some RCBS 147's and I had no more bullet in the case with my 158 then the rcbs had with 147. I never showed any pressure signs but the load was not outstanding in any way so I abandoned it. The truncated cone designs of 120-125 grs by Lee,RCBS and Lyman are the accuracy champs in the 9MM. They can be successfully run at 1200 fps+ safely and with excellent accuracy. I have a K-38 revolver that shoots 158's@900 fps with precision, so that's what I use them in.
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