The Firing Line Forums - View Single Post - IMR-4227 in 357 mag

**Unclenick** · January 25, 2015, 02:54 PM

The unburned powder is a low pressure sign. The Hornady manual's data does not appear to be pressure tested, so they tend to err on the low side with just about everything. The Hodgdon data shows 16.0 grains behind the 158 grain XTP. They develop the loads with a pressure gun and reference lot of the powder, so its generally the most accurate data for the powders they distribute. But they did use a WSP primer and not a magnum primer.

January 25, 2015, 02:54 PM	#5
Unclenick Staff Join Date: March 4, 2005 Location: Ohio Posts: 21,743	The unburned powder is a low pressure sign. The Hornady manual's data does not appear to be pressure tested, so they tend to err on the low side with just about everything. The Hodgdon data shows 16.0 grains behind the 158 grain XTP. They develop the loads with a pressure gun and reference lot of the powder, so its generally the most accurate data for the powders they distribute. But they did use a WSP primer and not a magnum primer. __________________ Gunsite Orange Hat Family Member CMP Certified GSM Master Instructor NRA Certified Rifle Instructor NRA Benefactor Member and Golden Eagle