Excellent post and information. I have used 158 grain cast bullets in 9mm in the 1980s before 147 grain bullets became popular. These were cast from an old Lyman round-nose mold. The ammo was sub-sonic, which is what I wanted. They functioned reliably in my Uzi carbine.I cast my 9MM bullets using 19 pounds of COWW and 1 pound of foundry type simply because I came across a large quantity of the latter at a very good price. (free) Normally I use a 125 grain TC style bullet but for grins and such I wanted to try some of the LEE 356-147-TC bullets.
I wanted to examine some fired bullets to see if there was anything unusual going on and just because I wanted some samples of fired bullets from my P-226 to compare to my 125 gr. bullets.
I had a 15-gallon grease drum that I ran 18" of water into, assuming that would surely stop the bullets. (it does on TV, right?) I covered the top of the drum with a feed sack, didn't want to get drenched, climbed up on the corral fence and fired 5 shots directly down into the drum from, perhaps 4 feet above the water. When I went to dump the water, I discovered 5 holes in the bottom of the drum. Those bullets had not only penetrated the 18" of water but, another 4-6" of dirt under the drum. Needless to say, my bullets were not what I wanted because the dirt had scuffed them too badly to compare to the 125s.
My SIG just didn't like that heavy bullet so after a couple hundred or so I parked the mold on the shelf with the other 50 or so molds I seldom use, tossed the 147s into the pot and turned them into 125s.
I have tried the SWC style bullets in my autoloaders with mixed results as far as reliability goes. To me that is NOT acceptable, ergo the TC style bullet.
I was never happy or comfortable using heavyweight (above 125 grain) bullets in 9mm pistols, and don't understand why they are so popular right now.
I have a 6-cavity version of the Lee 147 grain TC bullet that you mentioned. It is fantastic, and casts perfect bullets easily and quickly. I don't use it for 9mm, though; I use it only in full powered 38 Super loads. That makes a perfect combination.
I save the SWC bullets for revolvers, but I have thought about using the 147 grain TC, sized to .538, for my .38 and .357 caliber revolvers.
The picture of the two cartridges shows a 38 Super on the left loaded with the LEE 147 gr TC bullet, and a 9mm loaded with a LEE 120 gr TC bullet. The pistol is a .38 Super caliber Colt Government Model I bought new about two years ago.



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