starting to reload 40 S&W


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Old 01-03-2014, 11:57 PM   #1
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I am new to reloading and about to start reloading 40 S&W rounds. I am trying to find out, how can you know if you are crimping the bullet too much, or not enough?



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Old 01-04-2014, 12:37 AM   #2
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really cant "crimp " in the normal sense because the case mouth is what sets the cartridge depth and most .40 cal bullets dont have a traditional crimping groove on the bullet



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Old 01-04-2014, 01:49 AM   #3
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I am loading for my sub2000. I was able to assemble 5 dummy loads (only used the brass and a bullet) and I am able to cycle the round throw the rifle. from what I can tell the bolt closes all the way. now I think I am ready to add the primer and the powder. was going to use HP-38 powder for the rounds.

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Old 01-04-2014, 02:30 AM   #4
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I have used hp-38 with 40s&w. It will work well.

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Old 01-04-2014, 12:09 PM   #5
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Quote:
Originally Posted by beltor View Post
I am new to reloading and about to start reloading 40 S&W rounds. I am trying to find out, how can you know if you are crimping the bullet too much, or not enough?

The crimp on the 40 S&W is only used to remove the flare plus maybe a thou or two more.

It is not used to secure the bullet, neck tension does that.

How much you ask? Measure it. It should measure between .421 and .423. I strive for .422.
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Old 01-04-2014, 01:38 PM   #6
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That helps. This is going to be me first live rounds. I am just concerned that I am doing it wrong.

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Old 01-04-2014, 06:25 PM   #7
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i dont load for 40sw but i load a LOT of straightwall cases in 9mm 45acp 45colt 44mag. the technique is the same for all of em.

for taper crimping:

size a case then take your calipers and measure the outside diameter of the case mouth.

when you set the crimp adjust the die a teeny tiny scootch at a time until the crimp is setting the case mouth to the diameter you measured after it was resized.

setting the crimp tighter will crush the bullet and actually cause the bullet to be loose in the case.

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Old 01-04-2014, 09:52 PM   #8
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i dont load for 40sw but i load a LOT of straightwall cases in 9mm 45acp 45colt 44mag. the technique is the same for all of em.

for taper crimping:

size a case then take your calipers and measure the outside diameter of the case mouth.

when you set the crimp adjust the die a teeny tiny scootch at a time until the crimp is setting the case mouth to the diameter you measured after it was resized.

setting the crimp tighter will crush the bullet and actually cause the bullet to be loose in the case.
One noticable difference in the calibers mentioned above, while they are all straight sided, the 44 mag headspaces on the case rim, thus if it's overcrimped a tad, there will be no chambering/firing issues, per se, as there could be with a rimless cartridge that headspaces on the case mouth.
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Old 01-07-2014, 07:42 PM   #9
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Ok, I have 5 rounds loaded with federal small pistol primer (100 I think), Hornady 180 gn FMJ-FP, 4.2 gn of HP-38. 3 have an OCL of 1.124 and two of them hav a 1.120 will the two with the shorter OCL be ok, or do I need to pull the bullet and reset them?

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Old 01-08-2014, 12:05 AM   #10
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Default starting to reload 40 S&W

Quote:
Originally Posted by beltor View Post
Ok, I have 5 rounds loaded with federal small pistol primer (100 I think), Hornady 180 gn FMJ-FP, 4.2 gn of HP-38. 3 have an OCL of 1.124 and two of them hav a 1.120 will the two with the shorter OCL be ok, or do I need to pull the bullet and reset them?

I looked in my hornady, lee, and Lyman books and did not see that bullet and powder for 40. The closest I found was 180 gr xtp over hp38 and a Minimum COL of 1.125. That makes your 1.120 too short.

If it was me, I think I would pull the two at a minimum, and check if the gun would like something a bit longer than the minimum.

I have never loaded 40, so take this for what it's worth, but I would check to see if your gun would close on maybe 1.130-1.135, if that will fit in the mag. It may even like longer.


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