Load Data: Case: LC-CB.300, Remington, Wolf(Cut Down) 11 grains is sufficient to cycle the action. I use it with cast bullets and with 90 grain XTP pistol bullets in the blackout. Based on my experience loading for the 7.62x39, RL7 should be about optimum for the .300 AAC Blackout and you can probably just fill the case. 3 6 8 1. 2 6 0. I just built a 10.5" .300 Blackout AR pistol. I just bought a lee 155gr 2r made for the 7.62x39. Simple solution… reload! I've tried lee 160gr 1r slugs with no success. Trail Boss is a very bulky, very fast powder Unless it's compressed I don't think you could get enough into a blackout case to cause excessive pressure, but see the 30% rule as posted above. Heavy 200 to 240 gr. Any tips or load data is appreciated. Lee bullet mold on sale $19.79 : Well, there is not much extensive data for reloading either, but Sierra Bullets is trying to help change that. Anybody using cast bullets in their .300 blackout? It has ... *Shaded column displays subsonic load data. Use at your own risk. NOTE: Powders H110 and WIN 296 are Identical; Powders 4100 and Enforcer are Identical. M A X I M U M 1. As with any Published Load Data, USE CAUTION, double-check; Load UP slowly for supersonic, and DOWN slowly for subsonic when experimenting with undocumented loads. So, being the cautious guy I am, I started my load at 11 grains of H110. But unless you have a barrel of twist faster than 8” I would not expect very good results with the elongated 240-grain Lee bullet at subsonic velocity. There’s no real good load data for 300 BLK yet for the bullet weights I’m using, so since 300 Whisper is a lower pressure load one assumes it to be safe to use interchangeably. I have dies, a box of coated 245gr cast bullets from Missouri Bullets, 165-173gr jacketed bullets I bought mainly for .308 and .30-06, 170gr JSP bullets I bought for .30-30, and 110gr plated bullets I bought for .30 Carbine. 300 AAC Blackout Cast bullet load data June 28, 2016 June 29, 2016 JP All of my load data is published as is with no promise of anything. The 300 AAC Blackout (300 BLK) is a popular alternative cartridge in the AR-15/M16 M4 (AR) community. They recently published updated and expanded data for the .300 AAC Blackout caliber getting into more subsonic and heavier grain weight data; two areas that are typically lacking for information. The Hodgdon 300 AAC Blackout data for the 230 gr Berger tactical works fine for the Lee AAC bullet with many subsonic loads listed by Hodgdon. I plan to size these down to .309. Im starting to load 300 blackout and looking for the best bullet weight, powder type/grains for sub sonic suppressed. 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