my experience with cast boolits & auto pistols is that they need to be crimped, in order to feed reliably.
the crimp die set correctly, is where you pass the 'plunk' test
my experience with cast boolits & auto pistols is that they need to be crimped, in order to feed reliably.
the crimp die set correctly, is where you pass the 'plunk' test
The ogive gets larger along with the diameter of the bullet when it is pc’ed. Resizing only affects the diameter. You will need to seat them deeper into the case. Had a similar experience with my 300 blkout.
I have had the same problem in the past in my wife's SCCY CPX2. I thought the same as you, then I decided to check a dummy round OAL. I found that with the Lee TC pills I needed to seat a bit deeper than the RN pills. I was concerned at first about the depth of the boolits, so I loaded 5 and fired them and they fired flawlessly.
If you are running a max load and seating deeper you probably do need to reduce the powder charge a bit. Unless you measure velocity or pressure you won't know when you are over pressure.
I'm with Burnt Fingers on this one. I have personally measured probably 10,000 auto-loading handgun case lengths after reasizing because I was very anal in my early days. Not one of them grew past max length and they universally got shorter with successive firings and resizing. Many of them shrunk below trim-to lengths (even after sizing). Mine is anecdotal, but it is a decent sample size across several cartridges.
Further a die that sufficiently sizes down to the web will get reloaded brass to gauge reliably. I gauge all of my ammo and it will split before it won't gauge. 80-90% of my straight wall ammo is shot through Glock barrels.
Last edited by Taterhead; 06-23-2021 at 11:57 PM.
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Just wondering if it makes a difference if boolits are sized nose first or base first. Most of my sizing is done on a Star, nose first. I can see that metal might be displaced forward if sizing base first.
I have a Lyman but don’t think I’ve ever sized boolits for an auto loader on it. It’s used primarily for SWCs for revolvers.
Sometimes life taps you on the shoulder and reminds you it's a one way street. Jim Morris
I had a problem in an LCP with .380 bullets not wanting to go into battery that I had PCoated. Sized them down 1 more thousandth and they work fine now. I tried really crimping them hard but it did not work until I sized the whole bullet down one more thousandth.
post # 18 also explains why .45 colt cases (as an example where the rims doesn't get boogered up by an extractor) don't fit the normal shell holder after a lot of reloads- the groove gets mashed shut.
Loren
Gentlemen, I stand corrected as it appears there is an adequate mechanical reason for straight wall cases head spacing on the case mouth to get shorter in length. Thanks for bringing this to my attention.
After every firing I pneumatically run all my straight wall cases through a die to push out the bulge that develops above the rim before standard resizing. I started this years ago to assure every case would chamber. So my additional reworking of my brass appears to causing me to get a different result from the norm.
BP | Bronze Point | IMR | Improved Military Rifle | PTD | Pointed |
BR | Bench Rest | M | Magnum | RN | Round Nose |
BT | Boat Tail | PL | Power-Lokt | SP | Soft Point |
C | Compressed Charge | PR | Primer | SPCL | Soft Point "Core-Lokt" |
HP | Hollow Point | PSPCL | Pointed Soft Point "Core Lokt" | C.O.L. | Cartridge Overall Length |
PSP | Pointed Soft Point | Spz | Spitzer Point | SBT | Spitzer Boat Tail |
LRN | Lead Round Nose | LWC | Lead Wad Cutter | LSWC | Lead Semi Wad Cutter |
GC | Gas Check |