Loading lead cast bullets ( 230gr LRN 45acp )

[Metal god]

200 fps difference in a .45 ACP load?!
That's arguably 25% increase in speed. That is... not normal.

I did not mention the most interesting part in that . That 200fps increase happened in a .3gr increase in powder charge .

I realize those are plated bullets but, the same applies.

The bullets in the pic are bonded jacketed hollow points . Hornady 200gr XTP

So you guy think maybe I'm flaring the case to much ?

I'm surprised that a .005 set back is no big deal and I do know how to use calipers . How ever I can run the same test using my bullet comparator if you like .

I just got the reply from Lee about what crimp there 45acp FCD gives .

It applies a taper crimp

That was there total response .

 

[WVMountaineer]

The bullets in the pic are bonded jacketed hollow points . Hornady 200gr XTP

Guess I need to pay more attention. I was just locked on to those crimp grooves in the bullets.

I do believe you are either over crimping or seating to shallow or, a combination of the two. If they are plunk testing good in your barrel, than you are over flaring. I don't remember if you stated that or not. So, I'm just trying to cover all the bases. Load up a couple dummy rounds and see. Good luck and God Bless

 

[Metal god]

OK I just ran two more crimp test using those 200gr XTP .

First I re-sized some cases then adjusted the flare to just barely give enough to seat the bullet with out shaving copper off . I then seated the bullet to my COAL of 1.240 and gave it a medium crimp . I then did the chambering test and the bullet set back .007 .

Ok no problem I do all that agian with new case and bullet but this time I crimp it as much as my die will crimp VERY VERY heavy crimp . I then do the chambering test . I get bullet set back of .006 . I chamber it 4 more times in a row for a total set back of .037 . Now this is measuring with my .400 comparator .

OK no problem lets see if it's my seating depth so I do all the sizing , flaring etc but seat the bullet to Hornady's per manual 1.210 . I then give the cartridge a medium heavy crimp . I then chamber test the round . Any guesses what happen -------------- yep got a set back of .007 . So I chambered that round another 4 times for a total set back of .031 .

Either I'm doing something very wrong or set back is a normal thing . Now everything I've read about crimping says you crimp to AVOID set back . I don't ever remember reading anything that said you crimp to keep set back to a MINIMUM .

 

[Jim Watson]

Taper crimp on an auto round is not going to do much to stop bullet setback.

If it is bothersome, get the "U" die either direct from Lee or from EGW.
That will give greater tension on the bullet, with a "Coke bottle" constriction visible below the bullet base.

http://www.midwayusa.com/product/57...sizing-die-45-acp-45-gap?cm_vc=ProductFinding

http://www.egwguns.com/index.php?p=product&id=841

EGW says theirs are made to size farther down the case, but that is not what you need, save $10 and get the plain Lee from Midway.

If you want more security yet, get a cannelure tool and put a band around the case at the base of the bullet like some factory loads.

http://www.ch4d.com/products/equipment/bullet-tools/CanToo
http://www.corbins.com/hct-1.htm

They talk about using it to cannelure bullets to make a crimp groove but what I use my homemade device for is to cannelure the case at the base of the bullet to form a shelf to keep the bullet from setting back. Kind of expensive but if you are loading your own defense ammo, probably worth it.