Except that the .45 ACP was brought out in 1905, he (or Colt) may have used .30-03 or even one of the Mauser cartridges as the basic brass.
I'm sure a lot of it was due to the military not wanting to change cartridge specifications for one cartridge, totally disregarding the fact that Frankford Arsenal had its own oddball sized primers. 0.204" IIRC.
I did a bit of research back when the spp .45 started showing up, and the .357 Magnum and the .45 have virtually the same useable case capacity. To me this means that the spp should be sufficient for both. I think I found the capacity info in one of the Lee manuals, not 100% certain.
It is kind of a moot point for me since I don't load or shoot much .45 anymore. and have pretty much a lifetime supply of lpp brass.
Robert
I find it interesting that I have a couple of early 1911 examples and a couple of WW2 era examples that treat SPP quite differently. The earliest one will strike almost half primer pocket, second oldest is slightly better - both strike the 11:30 position. The newer ones handle either with a center strike.
Neither seem to affect accuracy!
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From what I read it was the introduction of the .45 GAP that messed us up with Small primers in .45 acp!
I did a limited test between the cases using 5 grains of RedDot under a 200 grain bullet my result showed a 30 f/s velocity loss with small pistol primers . I should probably tried some small pistol magnum primers I may have got that 30 f/s back? Another thing was the standard deviation was very low with small pistol primers HOWEVER the other size primer cases were mixed types civilian and older military so that may be why.
During the same test time I shot conventionally lubed cast bullets powder coated bullets and powder coated bullets with lube the results were all the same speed and accuracy and point of impact at 15 yards. (including Small pistol primers)
There is another thread on this subject somewhere here on castboolits.
When I think back on all the **** I learned in high school it's a wonder I can think at all ! And then my lack of education hasn't hurt me none I can read the writing on the wall.
Sp 45acp - the bane of progressive loaders !
I haven't seen any difference in performance.
Other than a PITA with a progressive press.
My Dillon 550, not a huge deal.
My son in laws 650 - kind of a pain.
Used to be someone on here that would trade sp 45acp for lp one for one. he only loaded 9mm, 357 and 45 acp, advantage to only stock sp.
I need to look around, I have ~a 4 lb coffee can of 45 sp
Cogno, Ergo, Boom
If you're gonna be stupid, don't pull up short. Saddle up and ride it all the way in.
The only diff in my tests is a small vel drop with spp v lpp with some powders. Other than the pita factor of sorting, no real diff. I gve my spp brass to a friend that shoots it in a revo.
EVERY GOOD SHOOTER NEEDS TO BE A HANDLOADER.
NRA Cert. Inst. Met. Reloading & Basic Pistol
I let a small primer 45acp brass slip by while sorting. The 1050 I was loading on tried to put a large primer in the small primer pocket. The primer went off and I nearly had to change my pants. It was loud!
As far as accuracy I see no real difference.But since I also run a 1050 I have to look at each case.Went to the range picked up my brass and got a couple pieces of blazer brass spp in with my lpp brass. Took two times of blowing my primers before I realized what the problem was. So now have to check every piece of brass really slows down the loading
I bought some commercial first fired brass and having a few SPP mixed in the batch is irritating.
I’ve recently started comparing both spp and lpp in 45acp through my colt series 70. Using WST powder I had a few unburnt kernels of powder in the barrel with the SPP. I upped the charge ~.2 and the unburnt powder was no longer in the barrel. Not sure if my Winchester spp we’re not hot enough or with WST I just need a little more powder
I realize this thread is about pistol primers (Lg & Sm) but I ran into this on the Starline Brass site when describing their SRP 6.5 Creedmore cases:
Our SR6.5CM brass uses a Small Rifle Primer. Many target shooters prefer the Small Primer for the increased consistency and accuracy. While other small pocket manufacturers use a smaller than standard flash hole, Starline uses our standard .080" flash hole, as we feel that it gives better ignition with some of the slower powders and in cooler conditions* (and you won't be breaking off decapping pins either!) The Small Primer version also maintains primer pocket size much better than the large primer version under higher pressures.
With LRP being almost unobtainium, having a SRP option is awesome.
As others have mention, I couldn't tell any difference between the two primers that mattered. I load on a RCBS SS, so the spp's don't bother me.
Hopefully we've all learned, more options is more better. You never know what you'll run up on.
SPP has a potentially stronger case head. A quick email to Starline might be worth the effort.
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 |