#240 grain 308 subsonic loads full#
#240 grain 308 subsonic loads mods#

Wife took a nap and interrupted the construction project I was doing adjacent to the bedroom, so I stole out to the range again and tried some things. I've learned a lot since I started this thread this morning. I chose the magnum primers for the first loads just to be 'safe'. I think doing that might be fine with jacketed bullets (what most people who recommend the large flash holes are shooting) but entirely the wrong thing to do with cast bullets. 308 loadings with heavy bullets and a lot of people say to drill the flash holes to 9/64' and use magnum primers to avoid S.E.E.

#240 grain 308 subsonic loads full#

Ok.JIM and RICK: The internet is full of 'wisdom'. I'll do some more and soon I'm going to do a write-up on the Form 1 suppressor I just built. I never have modified the rifle for an M1A or SR-25 magazine, but something like that is going to happen eventually. I wrote a little about the rifle in Special Projects along with one cruddy picture, I was in rare form that night so you'll have to forgive me. I expect powder placement will have a significant effect on accuracy and pressure. I intend to do more testing in this regard to see what effect powder location has on the velocity and if any ignition concerns arise. All my loads were fired with the rifle horizontal and powder settled horizontally in the cases before chambering them. I had no hang-fires whatsoever and very consistent chrono numbers, BUT I didn't test powder location within the cases. Primers did NOT set back but brass was pretty snug in the chamber to begin with. I shot a steel plate at 50 yards with one shot and the steel report was crazy loud compared to the report of the rifle.Ĭases were fully obturated and clean except a tiny bit of soot on the necks. Suppressed, the 6.5 grain load sounds exactly like firing a roll cap pistol, if you take away the bullet impact noise. I'm switching to SL-71 next test to see if the paraffin addition doesn't make the lube fling off better. Also, got some stringy lube boogers on the target without the suppressor, and some black greasy dust around the groups on the paper with the suppressor. I only tested at 15 yards because I was in a hurry, but open sights gave me 1/2' groups of three without my Form 1 suppressor installed and and literally put them all through the same hole WITH the suppressor. Elevation 1600 feet, not that it matters.ħ.1 grains gave me an average muzzle velocity (MagnetoSpeed) of 1030 fps for five rounds.Ħ.5 grains of Red Dot gave me 975 fps average. Range was calm, clear, very dry, and temperature about 70☏. Bullets seated in Forster Benchrest sliding collet die to 2.260', this puts the front band into the throat's freebore with about. 003' neck tension (too much, actually), cases belled just enough to prevent shaving.

#240 grain 308 subsonic loads mods#

NO mods to flash hole diameter.ĪCE 235 grain plain-based bullets (similar to NOE 311-230) cast of 2 COWW/1 SOWW/1 soft scrap, air cooled, sized. WCC-08 brass, match-prepped, necks turned, trimmed, inside VLD chamfer. 308 Winchester, Savage 111 LH with Savage factory 20' hog rifle barrel swapped to it. All disclaimers apply, don't be a dummy and if you blow up your stuff or get a baffle strike or have a Secondary Explosive Event (SEE) it's your own asphalt. Info is scarce on this so I made some for the internet.