I use magnum primers, but drilling out the flash holes seems like a poor solution to the problem of trying a different powder. I have NOT tried his shtick about magnum primers and drilling that flash holes on the cases out, I won't vouch for that all nor recommend it until you've loaded a lot of subs. This link is an interesting read where he goes over using pistol powders in the 308 specifically - those powders might be easier to come by than the cowboy powders. This is a big reason I have a Hybrid 46 from SiCo - the larger holes in the baffles give a lot more margin for error when I'm doing sketchy things. You can try to edge up into 180-200gn bullets if they're cup and core, preferably flat base, but shoot enough without the can on to be sure you won't get a baffle strike. Seat as deep as you can, this isn't the place to seat all snuggly with the lands. Bullet weight isn't just about retained energy, it's also about being able to use a larger charge weight yet stay slower and because bigger bullets take up more space, both working to maximize your load density. One issue you'll be working against is the extra case capacity of the 308 relative to the very small capacity of the 300 BLK (I use that a comparison because it's a versatile 30 cal sub). If you want to do this though (I'll support it, I'm crazy when it comes to subs), start high, work slower, make sure you don't stick a bullet in the barrel, and make sure bullets are stabilizing before you launch your can downrange. No way you're going to get there with a 200+gn mono, which are the ones that expand the best in my experience. The 308 can be made to work but the twist is going to hurt you a lot by limiting your bullet weight/length. My opinion (I'll only give it once, promise) is that you're beating a square peg into a round hole, centering mainly around a 26" 10 twist barrel isn't right for this. If you did that I would drill the cavity more open. Some people have been pulling the polymer tips from Hornady bullets (especially in the big 458s) to get better expansion. Hornady 190gn Sub-Xs are ok, you can also use the 160gn FTX for the 30-30. ![]() I shoot the 200s in 300 BLK - they're designed to open slow, and these two are in your twist range. 308 Expanding Subsonic Bullets 1:10 twist (Box Qty - 50) !!! THIS IS NOT LOADED AMMO!!!!", Projectiles, 308180SBLK
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