• You are using the old Black Responsive theme. We have installed a new dark theme for you, called UI.X. This will work better with the new upgrade of our software. You can select it at the bottom of any page.

Cast seating tenth and charge size.

Status
Not open for further replies.
C

Cgnelson1978

Member
Joined
Jul 4, 2017
Messages
1
I'm sure this has been asked a million times but I'll be darn if I can find it.
I'm loading 45.acp. I have an rcbs 230gr rn mold. I can't find data anywhere. I tried using data for other cast bullet and get an oal of 1.267. It is way to long to chamber in my xds. I made a dummy round and it finally plunked at 1.245 this looks correct in relation to the driving bands just a touch of the top band showing. is this correct?
Also, if it is, how do I determine charge accounting for the drop in case capacity?
Thanks
 
That isn't unusual for the XD line, and 1.245 sounds right, but there is no formula for reducing the charge in relation to reducing the OAL.

You have a couple of things in your favor. The .45 ACP is a low pressure round with a lot of case capacity, so shortening the OAL by seating a little deeper doesn't have nearly the affect as say doing it in 9MM.

The vast majority of lead data will be safe at 1.245. If in doubt, stop a couple of tenths short of max. What powder(s) and power level are you looking to load?

Welcome to THR
 
QuickLoad is the only resource I know of for adjusting powder charges for shorter OALs than listed in the published load data.

Another approach is just to start at the minimum load and work up carefully with a chronograph to measure the velocity with each powder charge. STOP when you reach the velocity listed as the max book velocity or the powder charge listed as the max powder charge (whichever is lower). Odds are you'll be a couple tenths below max, but this also requires your barrel length to be the same or longer than the one listed.

With cast bullets, you should probably only be looking to find the weakest powder charge with which the semi-auto functions reliably. So you might also take the approach of starting with the minimum listed load, working up in small increments, and stopping when you get reliable functioning, which should be well below max (and may well be the minimum load.)
 
Attached is the Hodgdon Page for 45ACP, w/230gr RN Cast
 

Attachments

  • Hodgdon 45 ACP All Data.doc
    38.8 KB · Views: 3
I have used all of these loads at different times and had good luck.

Bullet Weight (Gr.) Powder Bullet Diam. C.O.L. Grs. Vel. (ft/s) Pressure Grs. Vel. (ft/s) Pressure


230 GR. LRN 800-X .452 1.200" 6.5 867 15,100 CUP 7.0 939 17,300 CUP - Hodgdon
230 GR. LRN 231/HP-38 .452 1.200" 4.3 699 12,200 CUP 5.3 834 16,900 CUP- Hodgdon



230 GR. LRN TrailBoss .452 1.200" 3.5 658 11,200 CUP 4.5 761 15,100 CUP- Hodgdon
230 GR. LRN 700-X .452 1.200" 4.5 831 14,500 CUP 5.0 893 17,700 CUP- Hodgdon


230 GR LRN Bluedot .452 1.200" 9.8 915 19,300 CUP Start at 8.8gr and work up gradually (From Alliant)

Hope this helps
Dan




 
Status
Not open for further replies.

Similar threads

Cliff6
please check my 45ACP loads
Replies
4
Views
324
Cliff6
Cliff6
M
  • Locked
9mm cast load data
Replies
1
Views
404
JamieC
J
CLP
  • Locked
Will be casting soon.
Replies
9
Views
541
35 Whelen
35 Whelen
M
  • Locked
Having issues with 124g HBFP-TP
Replies
22
Views
765
Dudedog
Dudedog
Zendude
  • Locked
Bullet length data
Replies
11
Views
6K
Duvel
D
Back
Top