220 grain 308 subsonic load data9/18/2023 308 Winchester (7. I like the system on this Sig because it gives me selectable options with gas port size.Īs far as claiming to have done it but not giving out the recipe.I have to those that have asked. with the 13.0 g (200 gr) FMJ Boat Tail Subsonic tactical projectile. I picked up my Sig716 a month or so ago so I now know they work in the piston system as well. My buddy wanted to go with 250 grain Hawk Bullets which work as well but they are a really tight fit when chambered should you want to clear your weapon of a live round. I tested out of my 700AAC before further testing thru my buddies integral suppressed DPMS as they both have 1/10 twist barrels. Using Hornady 220 round nose, it took me probably 50 different loads using several different powders over several months of weekend range time to find something that would work. Some have claimed to have done it but noone gives out the recipe. Also try loading up some 208gr or 220gr bullets as subsonic so that if your initial mod cycles them but not the 175gr, then you'll know you are close to success.īendersquint wrote:I have been trying for years and nowhere near finding the right combo. That spring mod seems like the first thing to try. However, you're right that trying a lighter spring may be a cheaper and more reliable fix to actually cycle down to your 175gr bullets. I suspect you'll probably end up between 12.5-13.5 gr trail boss for the 220gr RN.308 smaller sized case would normally take less powder charge, but the 220gr bullet is heavier Which will take more powder to. That's probably what you want with your LR-308. 30-06 sized case using win brass I ran 13.5gr trailboss under a 208 amax seated. You might PM him about the size of the gas port used in 300 AAC Blackout to reliably cycle subsonics. Robert Silvers had the same issue developing the 300 AAC Blackout PDW, where 220gr subsonic operated perfectly and any bullet less than 200gr did not. However, using the 220gr subsonics it ejects the brass but the bolt doesn't go far enough to the rear to pick up another cartridge from the magazine. The 220gr subsonics actually ejects the brass but no subsonic bullet lighter than 220gr ejects for me. Since I am at 5000' or above here in Colorado, the heavy 220gr bullets are stable at subsonic for me with the 1in10 twist (probably not stable for you closer to sea level). I don't have any experience with mods but lots of experience using my LR-308B (18" barrel) with subsonics.
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