This is a base swage kit, not really a buldge busting kit. They should call it a base swage kit like Redding does.
Lee sells the makorov die if you call and request their bb kit. It takes a lot of force for some. Swages back to around 0.397
I love base swaging, it pays back later. De-cap, swage, ss wash. l decap in designated lee loadmaster super fast, Then base swage in arbor press because big "D" RCBS pess took way to much pressure with lee buldge buster kit. Found the improvement on castboolits.
So many are confused about base swaging. Redding dont even offer 9mm swage kit, unless you call.
Finished ammo runs better and goes in factory spec cartridge gage too, which most people do not do either. They will when they get older and retired, hehehe. Nice brass around here.
In the arbor press the mouth goes in first and l check each head stamp before mashing it thru. I have alot of range brass to go thru, so i toss headstamps l dont want. I decap before case base swaging. Then wash.
I recommend sectioning 1 case from each brand so you can profile the pusher tip to not damage the inside of the cases. Also make sure the pusher does not alter the flash hole by removing some metal in the center (.010 or so).
l know Redding and Lee push the headstamp. Keep in mind Lee sell makorov die to base swage. That die takes much more pressure to push thru. Its in saami specs.
lets face it, many do not do this or use a cartridge gage for 9's or 380/45, etc.. l enjoy preppin brass and it does help.
I think if lee used 9mm die instead of mak die it would not go down small enough @ thick brass base. wiki show's .392 and .391 (9mm) on other @ base. I may have a 9mm FCD here. l'll try both but its so close it dont matter.
The pros have a roller base swager, this is poor mans way but has my ammo happy and gaged. Lil' pistols want same all the time. My TCP never fails with my reloads. Yes, one time i did some 380 brass but not needed. Get real nutty in august, the SS check is coming. hehehe.
I have other name on this thread below: lts all good too:
If you use arbor press for base swaging and gas check seating its just better all around and you dont put un/necessary roughness on your expensive press's you have bought. (arbor press 1 ton @ harbor freight).
lf you run a lee loadmaster vist: mikesreloadingbench.com (l have all his stuff)