Need help with reloading 9mm
- Thread starter Brno6
- Start date
Brno6
When resizing pistol ammunition the expander die should expand the case .001 to .002 smaller than bullet diameter and this "grip" on the bullet should hold it in position. The taper crimp removes the case mouth flare and the crimp should only be .001 to .002 smaller than the outside diameter of the case below the crimp. The taper crimp die should be called the case mouth streamlining die to aid in chambering without the case mouth causing the cartridge to hang up. On plated bullets if you over crimp you will compress the bullet and break through the plating and accuracy will suffer and you may have leading.
If you have thin cases and a expander die on the large size your bullet grip will be loose and the bullet will move under recoil and could also move even more when "slammed" into the chamber. The barrel "plunk" method is good but a case gauge is better for checking your resized cases for proper case length and cartridge overall length. If you do not have a vernier caliper you should buy one to aid checking your cases and finding any problems you may have while loading.
Below a case gauge insures all your reloaded rounds will chamber in any pistol, the "plunk" method only applies to "your" chamber. My ammo is used in my two sons pistols so the case gauge works better when you can't "plunk" someone elses pistol and are loading to factory specs.
You may have a weak grip on the bullet and the bullet is moving or the cartridge overall length is too long or both. There is also a chance your Italian made pistol has too much olive oil on it and is making your bullets slippery. (Bazinga)
Now read this about OAL in the link below in Wobbly's postings, it is great information and this can apply to any pistol. (expanded plunkology)
How to determine Max OAL for a CZ Pistol
http://www.czfirearms.us/index.php?topic=34225.0
When resizing pistol ammunition the expander die should expand the case .001 to .002 smaller than bullet diameter and this "grip" on the bullet should hold it in position. The taper crimp removes the case mouth flare and the crimp should only be .001 to .002 smaller than the outside diameter of the case below the crimp. The taper crimp die should be called the case mouth streamlining die to aid in chambering without the case mouth causing the cartridge to hang up. On plated bullets if you over crimp you will compress the bullet and break through the plating and accuracy will suffer and you may have leading.
If you have thin cases and a expander die on the large size your bullet grip will be loose and the bullet will move under recoil and could also move even more when "slammed" into the chamber. The barrel "plunk" method is good but a case gauge is better for checking your resized cases for proper case length and cartridge overall length. If you do not have a vernier caliper you should buy one to aid checking your cases and finding any problems you may have while loading.
Below a case gauge insures all your reloaded rounds will chamber in any pistol, the "plunk" method only applies to "your" chamber. My ammo is used in my two sons pistols so the case gauge works better when you can't "plunk" someone elses pistol and are loading to factory specs.
You may have a weak grip on the bullet and the bullet is moving or the cartridge overall length is too long or both. There is also a chance your Italian made pistol has too much olive oil on it and is making your bullets slippery. (Bazinga)
Now read this about OAL in the link below in Wobbly's postings, it is great information and this can apply to any pistol. (expanded plunkology)
How to determine Max OAL for a CZ Pistol
http://www.czfirearms.us/index.php?topic=34225.0
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To the OP do not use a roll crimp with either .45acp OR 9MM. One of the posters here suggested that and the poster is wrong Post 4. Apply a taper crimp. If you run your fingers over the case you should feel no lip left from when you belled the case. The surface should feel flat.
If you have a set of calipers her is how to determine the max length for any given bullet/cartridge/pistol combination. It is fast and accurate using your caliper.
1. Remove your barrel from the gun.
2. Measure the length of the bullet you are going to use.
3. Drop the bullet into the chamber and measure from the base of the bullet to where the cartridge case would lie flush with the barrel hood.
4. Add the two measurements together and subtract a couple of thousandths of an inch off the total to allow for press seating and bullet length variances.
5. Check to see if that length will fit in your magazine (It should)
You now have the total max OAL for that bullet for that gun. You may have to reduce the OAL if you run into feeding issues.
Load and use your barrel as your case gauge as Repete suggested.
I have several 9MM guns and OAL for 124/125 gr bullets range from 1.1" for the 356402 Lyman bullet to 1.115 for the Montana Gold 125 gr RN. Generally speaking I have found if the bullet fits the guns with shorter leads they will run well in all my guns.
If you have one gun then the above method will serve you well.
Take Care
Bob
If you have a set of calipers her is how to determine the max length for any given bullet/cartridge/pistol combination. It is fast and accurate using your caliper.
1. Remove your barrel from the gun.
2. Measure the length of the bullet you are going to use.
3. Drop the bullet into the chamber and measure from the base of the bullet to where the cartridge case would lie flush with the barrel hood.
4. Add the two measurements together and subtract a couple of thousandths of an inch off the total to allow for press seating and bullet length variances.
5. Check to see if that length will fit in your magazine (It should)
You now have the total max OAL for that bullet for that gun. You may have to reduce the OAL if you run into feeding issues.
Load and use your barrel as your case gauge as Repete suggested.
I have several 9MM guns and OAL for 124/125 gr bullets range from 1.1" for the 356402 Lyman bullet to 1.115 for the Montana Gold 125 gr RN. Generally speaking I have found if the bullet fits the guns with shorter leads they will run well in all my guns.
If you have one gun then the above method will serve you well.
Take Care
Bob
