SPEER #14 Manual Data...

[charliemopic]

I just started reloading last summer so I am still trying different bullets and powders and still learning.
Looking in the 'Speer Reloading Manual #14' for .45Auto, 230gr. TMJ-RN they list 7.0 to 8.1gr of PowerPistol at 1.26 OAL.
For 230gr. GoldDot-HP they list only 6.3 to 7.4gr of PowerPistol at 1.20 OAL.
I'm wondering why the big difference in powder loads?
The 230gr. bullets I am loading are the Hornaday XTP-HP. Is the Speer data good for the XTP bullets?

Any recommendations or pet loads for .45Auto or 9mm Luger useing BlueDot or PowerPistol powder.
How about Titegroup or Universal for .45auto or 9mm?
.45s will be used in a 1911.
9mm will be used in CZ75 SPO1. No Glocks.

Thanks For Your Time.
Angelo near Joliet, IL.

 

[Walkalong]

They list separate loads for the .45 ACP Gold Dot because of the much thicker construction.

I don't use either of those powders with .45 ACP.

 

[rcmodel]

The Gold-Dot & TMJ are plated jacket bullets, as opposed to the XTP's cup & core construction.

In addition, if you look closely at them, you will note the TMJ-RN bullet profile gives a shorter bore diameter bearing surface then either the G-D or the XTP hollow-points.

That increases bore friction slightly over the RN bullet.

In general, a HP will always displace core metal, and that makes either the bearing surface, or the whole bullet slightly longer for weight then a RN.

rcmodel

 

[Ridgerunner665]

My everyday load is 7 grains of Power Pistol with 230 XTP's...its a warm one but I have loaded as much as 7.4 grains and they still shot fine for me.

7 grains gets me 830 fps from the 4.25 inch barrel on my 1911...I only wanted to get 5 inch barrel performance from the shorter barrel...it works like a charm.

I have a Hornady manual...they say 7.6 grains max with 230 XTP's. (OAL 1.23")

 

[Galil5.56]

Maybe and combination of seating depth, and a long full diameter shank plays some role. I load 230 Gold Dots, and when seated to 1.200" the base of the bullet is very far inside the case.

That is a pretty wide spread of max charges for two of essentially the same type bullet (thick copper plate/lead core), but the same thing is seen with older WW data for 230 FMJ vs 230 JHP (5.7 for FMJ, 5.1 for JHP).

 

[USSR]

I would surmise that while the weight is the same, the amount of bearing surface is not.

Don

 

[charliemopic]

Bearing surface to friction, something I havn't pondered.

 

[NotSoFast]

It could be not just bearing surface but could also be seating depth. A deeper seating depth could mean higher pressures using the same powder charge just as increased bearing surface.

 

[ArchAngelCD]

I think it's all of the above. The combination of the deeper seating depth and more bearing surface would without a doubt raise the pressures to an unacceptable level if the higher charge listed for the the generic bullet was used.