Yes, you are correct about the cartridge name.Oooo....that's ugly!!! PPC, Pindell/Palmisano? Do I have that right? They were sure hot for a few years around here. Don't hear much about them anymore.
The 6mm PPC is still the cartridge of choice for the Light and Heavy class in IBS and NBRSA for the 100 yard events. There is also a large number of competitors that use it in the 200 yard events. The 6mm BR is the cartridge of choice for the 300 yard events do to a 200 FPS higher velocity.
The 6mm PPC USA is a no turn neck, meaning the necks are not turned on a lathe for a consistent neck thickness. The 6mmPPC USA is a request by both Sako and Norma for a commercial chamber and case dimensions. Custom 6mmPPC used by benchrest competitors use a tight neck chamber that requires the cartridge case neck OD to be .260”- .261” with the rifles chamber neck section to be .262”-.263”. The 6mmPPC USA factory cartridge neck is .267” with the chamber neck section dimensions being .270”-.271” Norma is the only company that offer the 6mmPPC USA cartridge as a factory load or ready to handload cases. Most benchrest competitors prefer the Lapua made 220 Russian cartridge case to make into 6mmPPC, which will require both a turned case neck and a fire form. If Lapua cases are not available they will begrudgingly use the Norma cases which are a little softer brass alloy then the Lapua which means less firings of the cartridge case. Also the primer pockets will blow out sooner because the 6mmPPC really excels when the cartridge is pushed to maximum powder chargers.
The powder of choice is N-133, H322, A- LT-32, IMR 8208XBR, and Benchmark. The primers used are either CCI BR-4, Federal 205M, and Remington 7-1/2.
Barrel lengths are usually 21-1/2” for both Light and Heavy Varmint, and rifling twist is 1:14. Most competitors use a 60-62 grain flat base bullet produced by many of small business bullet makers with some exclusively only making bullets for BR. Bart’s, Barns, and Burger are just a few of them.
I do not compete in BR. It is just to expensive to get into. Usually one has to spend $5,000-$7,000 to acquire the rifle and equipment to be competitive on a national level. I do how ever follow what is going on with that particular firearms sport. It is the ultimate in firearms accuracy that has my interest.
And as usual I went total OCD in what could had been a simple reply.