Loading problem Question!!??

tightgroup tiger · Jun 7, 2022

I agree, the cases must have been overcrimped on long cases or something was in there interfering with the crimp process, like shavings from cases from just the normal crimp process and so on. Either way it looks like you got it fixed.
I always thought flat nosed bullets were much easier to seat than round nose bullets, which helps with keeping the consistency of your OAL, I prefer them to round nose any day of the week.

joneb · Jun 12, 2022

74man said:
I was loading 124 gr 9mm Flat Point today and I couldn't get a set col. I would set the die at 1.120 and measure one case, then the next one would come out at 1.110 and then again the next one would be 1.115 without adjusting anything at all. What am I doing wrong? I have an RCBS Carbide set. I screw the die down until it touches the ram and back it off about 2 turns. Then I set the first round to a col of 1.120 and I would use that completed round to set my crimp. I would back off the Seater Stem and screw the die down to a light crimp, then screw the seater stem down until it just touched the bullet and I would adjust from there but for some reason my setting would change with every cartridge, what could cause this to happen. I am confused. Help???

well the possible answer recently hit me, when you taper or roll crimp it will shorten the COL as the bullet is pull down in the crimp prosses. I find this is more so with the taper crimp. Now if the brass varies in length the amount of pull down will vary.

higgite · Jun 13, 2022

joneb said:
well the possible answer recently hit me, when you taper or roll crimp it will shorten the COL as the bullet is pull down in the crimp prosses. I find this is more so with the taper crimp. Now if the brass varies in length the amount of pull down will vary.

How will a taper crimp pull the bullet down? With a combo seating/taper crimp die like the OP has, crimping takes place as the bullet is being seated, not afterward. Actually, when I over crimp using the same die as OP's, it resists seating the bullet fully and COLs come out longer than when the crimp is set properly to just remove the flare at the case mouth.

joneb · Jun 13, 2022

higgite said:
How will a taper crimp pull the bullet down? With a combo seating/taper crimp die like the OP has, crimping takes place as the bullet is being seated, not afterward. Actually, when I over crimp using the same die as OP's, it resists seating the bullet fully and COLs come out longer than when the crimp is set properly to just remove the flare at the case mouth.

I seat and crimp in separate steps, while recently loading some 44 Rem. magnum with plated bullets in trimmed brass I noticed the COL was .007" shorter after applying the LEE taper crimp. I am using a heavy crimp for these loads.

higgite · Jun 13, 2022

joneb said:
I seat and crimp in separate steps, while recently loading some 44 Rem. magnum with plated bullets in trimmed brass I noticed the COL was .007" shorter after applying the LEE taper crimp. I am using a heavy crimp for these loads.

That makes more sense, but OP was having a problem while using a combo die. Thanks for clarifying.

joneb · Jun 13, 2022

higgite said:
but OP was having a problem while using a combo die

My die set for Rem. 44 mag is a RCBS carbide die set, the seat and crimp die has a roll crimp which I did not want to use with a plated bullet in a tube magazine. I loaded some 240gr Xtreme plated RNFP for auto loader, I used the RCBS seat/roll crimp to seat only and then used a lee collet die to crimp. This has worked for me with revolvers but it did not with the semi-auto, so I tried the Lee taper crimp and all went well. After trimming the cases I chamfer the inside of the case mouth to prevent cutting the plating when crimping. I found this method worked well for maintaining a consistent COL.

Loading problem Question!!??

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