Thanks WL44. The article by John Linebaugh was great, especially the last two paragraphs. It explained a lot.
Gee Redhawk, I didn't know it was against the rules to ask a question in another way in hopes of getting a better answer. This time it really paid off. And by the way, I did contact S&W and basically they just advised me to get in touch with the ammo manufacturer. They weren't a lot of help.
Old Griz, I was just letting Mikey know you already participated in that other thread. It was not meant to stop you from asking other questions, so chill out.
If I recall, I did post links to Corbons suggestions on what was acceptable in a 45 colt S&W handgun is several other threads. But here it is again.
From The S&W site.
What kind of ammunition should I use in my S&W handgun?
Use only commercially manufactured ammunition with internal ballistic pressures which are in strict accordance with the specifications of the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI).
Be certain all ammunition you use complies with the SAAMI specifications. If you are uncertain, contact your ammunition supplier for verification.
If you would like any further information on specific ammunition, you may contact one of the major ammunition manufacturers from the link listed below:
Click here for major ammunition manufacturers
From Cor-bon.
Q. Can I use the 45 COLT +P loads in my S&W model 25 Mountain Gun?
A. Yes, the 45 COLT +P loads can be used in the S&W model 25 and the other modern S&W guns. You need to be sure that your gun is in good condition and hasn't had too many years of hard use. The 335 gr. Hard Cast load is probably a good choice. It operates at a little less pressure, but still packs a real whoop. New guns come out every year and the 45 COLT is a popular cartridge. If the model gun is not offered in 44 Magnum, it doesn't have the metal to handle the 45 COLT +P. The new titanium and scandium guns are nice to pack, but these are intended for self defense -- not hunting. The 45 COLT +P loads are not suitable for these guns.