The Firing Line Forums - View Single Post - Comparative perfromance between primer brands

iraiam · April 18, 2014, 04:28 AM

I advise to drop the powder charge some and work back up. I have some experience switching primer brands and have seen first hand how it can lead to an unexpected rise in pressure.

IMO It's not just the power of the primer that is the issue, but the effect of this primer change on the powder burn that is more important. I have seen what looks like much more than a 4-5% increase in pressure by switching out only the primer brand.

I have since worked up different max powder charges on numerous recipes with different primers, although Fiocchi is not a brand I have used.

April 18, 2014, 04:28 AM	#10
iraiam Senior Member Join Date: September 6, 2012 Location: Lakewood, CO Posts: 1,058	I advise to drop the powder charge some and work back up. I have some experience switching primer brands and have seen first hand how it can lead to an unexpected rise in pressure. IMO It's not just the power of the primer that is the issue, but the effect of this primer change on the powder burn that is more important. I have seen what looks like much more than a 4-5% increase in pressure by switching out only the primer brand. I have since worked up different max powder charges on numerous recipes with different primers, although Fiocchi is not a brand I have used. __________________ NRA Lifetime Member Since 1999 "I ask, sir, what is the militia? It is the whole people except for a few public officials." George Mason