The bullet design is going to be a big factor in pressure levels. Using 13.0 gr of 2400 with a standard Win LP primer, I got 1040 fps with a 255 gr Oregon Trails LSWC and 960 fps with a 270 gr Keith LSWC. Both out of a 5" M625-4.

I've shot this 270 gr load out of a M1917 too.

And You where using ACP brass?


Happy New Year

Yep, just run of the mill .45 ACP brass. I prefer it to AR brass, so I can use RIMZ moon clips. There probably aren't too many AR balloon head cases still floating around, but I know ACP brass isn't going to be balloon head.

As a note, .45 Super brass could be used, but it has less case capacity, so the loads would need to be watched for signs of high pressure. Working up a load, from a start load, is the best way to accomplish that.

I made a reference to "balloon head cases" in my previous post. So, to clarify what I was talking about, here's page from Speer #10 that has a picture of the difference between the two cases.



Now, maybe someone can explain why the AR is specified at 16,900 cup, when the ACP, shot from the same gun, is specified at 19,900 cup?

The Accurate Arms website says 45AR SAMMI is 15,000. Go figure.

quote:

Originally posted by Paul5388:
The bullet design is going to be a big factor in pressure levels. Using 13.0 gr of 2400 with a standard Win LP primer, I got 1040 fps with a 255 gr Oregon Trails LSWC and 960 fps with a 270 gr Keith LSWC. Both out of a 5" M625-4.

I've shot this 270 gr load out of a M1917 too.

And the recomended start load would be?

I'm going to use Seller&Bellot brass with
Federal LP magnum primers. (only one i'v got)

Qball,

The Speer #8 page I posted used a magnum primer to get their data, which is very close to what I got with a standard primer. Contrary to practices/warnings with H110/W296, 2400 can be loaded lighter without the same kind of problems. That means you could start with 10.0 gr and not worry about a squib load sticking in your bore. Seating depth, depending on the bullet design, will make a difference in the pressure and velocity you get.

For further guidance, and in case you haven't seen this, here's what Elmer had to say about .45 AR/.45 ACP loads (Pay attention to the "Important" in the left hand column).

Thank you Paul.
I'll just hope that i could find my own
"Sixguns Loads" by mr Elmer.
I bought some of his books but packed them
in a box some where on the attic.
Super Bummer

quote:

Originally posted by epj:
Other comments as to the suitability of cast bullets in the M25?

I have been using the same load in my M25s for over 30 years because it works so well. It is the cast 452460 and 7.0 grains of Unique. Cartridge LOA is 1.225". This puts the mouth of the case even with the bottom of the first driving band. Bullets are cast from wheelweights and sized .452. Bullet weight is around 210 gr. They are not heat treated. Believe or not, harder alloys do not shoot as well. Both of my m25s (you only need one) consistently put this load into 1.25" or less at 25 yards for 6 shots. Accuracy holds out to 100 yards, and maybe beyond for all I know. (All these loads drop like a rock past 100.)

Both of my m25s' chamber throats all slug out at a consistent .452". I believe making sure bullet fit is good there is one of the best things you can do to get good cast bullet accuracy out of these guns. It's because those bullets have a long way to go to get to the forcing cone and rifling.

quote:

Originally posted by pinkymingeo:
The Accurate Arms website says 45AR SAMMI is 15,000. Go figure.

I believe they keep the pressures on the AR down because they imagine all the old clapped out M1917 Colts and Smiths out there just waiting to blow up. Same reason why the factories don't load the 30-06 or 7X57 to their potential.

If a M1917 can shoot .45 ACP at 20,000+ psi, which it can, there's no reason to limit the AR to 16,000 psi.

I agree with you, but I guess the ammo companies and manual writers don't.