Magnum Primers for AR loads

[BobinNC]

I used 24.2 grains of TAC and CCI 450 primers under Nosler 77 grain CC bullets in LC Brass . This yielded me the best accuracy and 2677 FPS from my 18" barreled 5.56 chambered AR. Quickload says that's a 54,961 PSI load.

I've found that TAC getting a bit squirrely in high heat as often found in NC in August, and I'm transitioning over to VV N140 for more temp stability for my 77 grain loads that are for longish range use.

Won't be able to finalize this N140 load until it gets hotter here, but 24.4 grains of VV N140 looks like the ticket.

I'm relegating TAC to my 62 grain Gold Dot Loads (25.2 grains of TAC) were it's more comfortable, with 50000 PSI loads, as shots with that combo are used for mostly under 200 yd targets.