Can someone tell me if I'm correct?

MDS · January 17, 2011, 11:25 AM

I'm loading .40S&W for XD service. Having a hard time finding Win 231 data in my manuals. Using Hodgdon data. 180gr XTP 1.25 4.1-5.0 grns of 231
I worked up some dummy rounds and my guns really like 1.130 with 180 JHP. Am I good to go with this data and longer COL?

McClintock · January 17, 2011, 12:28 PM

If you mean 1.125 instead of 1.25, and if the JHP you're using is similar in shape (i.e. ogive) to the XTP, then yes, you should be okay. Otherwise, you're using a shorter OAL than is called for in the recipe and that is not a good thing. From what I know of the .40, it's pretty sensitive, pressure-wise, to changes in OAL and charge weight, but a change of .005 should not result in a pressure spike, especially at the lower end of that charge range.

Hope that helps!

Cheers!
McClintock

MDS · January 17, 2011, 12:30 PM

Sorry, my fault. Yes 1.125 Thank you.

m&p45acp10+1 · January 17, 2011, 03:27 PM

Seating farther out will not hurt. Seating deeper than the listied minimum in .40 S&W is asking for trouble. .40 is a pretty high pressure round to start with. There is not much room for margin of error.

zippy13 · January 17, 2011, 05:17 PM

Just think of it this way: if you substitute a RN for a HP using the HP's OAL may result in the RN being seated too deep, which may increase pressure dangerously. On the other hand, if you seat an HP to a RN depth, you may seat on the shallow side which may lower pressure and performance.

The data I have for the .40 S&W with a 180-gr XTP all recommend a 1.125-inch OAL which is well within of the maximum OAL of 1.135-inch. If you wish to extend your OAL to 1.130 for better feeding, you may experience some slight performance degradation.

MDS · January 17, 2011, 05:39 PM

Yeah that's to be expected I guess.

January 17, 2011, 11:25 AM	#1
MDS Senior Member Join Date: September 9, 2005 Location: Ohio Posts: 492	Can someone tell me if I'm correct? I'm loading .40S&W for XD service. Having a hard time finding Win 231 data in my manuals. Using Hodgdon data. 180gr XTP 1.25 4.1-5.0 grns of 231 I worked up some dummy rounds and my guns really like 1.130 with 180 JHP. Am I good to go with this data and longer COL?

January 17, 2011, 03:27 PM	#4
m&p45acp10+1 Senior Member Join Date: May 3, 2009 Location: Central Texas Posts: 3,930	Seating farther out will not hurt. Seating deeper than the listied minimum in .40 S&W is asking for trouble. .40 is a pretty high pressure round to start with. There is not much room for margin of error. __________________ No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.

January 17, 2011, 12:28 PM	#2
McClintock Senior Member Join Date: December 5, 2008 Location: The Bald Prairie of Southern Saskatchewan, Canada Posts: 305	If you mean 1.125 instead of 1.25, and if the JHP you're using is similar in shape (i.e. ogive) to the XTP, then yes, you should be okay. Otherwise, you're using a shorter OAL than is called for in the recipe and that is not a good thing. From what I know of the .40, it's pretty sensitive, pressure-wise, to changes in OAL and charge weight, but a change of .005 should not result in a pressure spike, especially at the lower end of that charge range. Hope that helps! Cheers! McClintock

January 17, 2011, 12:30 PM	#3
MDS Senior Member Join Date: September 9, 2005 Location: Ohio Posts: 492	Sorry, my fault. Yes 1.125 Thank you.

January 17, 2011, 05:17 PM	#5
zippy13 Senior Member Join Date: August 23, 2008 Location: SoCal Posts: 6,442	Just think of it this way: if you substitute a RN for a HP using the HP's OAL may result in the RN being seated too deep, which may increase pressure dangerously. On the other hand, if you seat an HP to a RN depth, you may seat on the shallow side which may lower pressure and performance. The data I have for the .40 S&W with a 180-gr XTP all recommend a 1.125-inch OAL which is well within of the maximum OAL of 1.135-inch. If you wish to extend your OAL to 1.130 for better feeding, you may experience some slight performance degradation.

January 17, 2011, 05:39 PM	#6
MDS Senior Member Join Date: September 9, 2005 Location: Ohio Posts: 492	Yeah that's to be expected I guess.