Do you live at a higher elevation? That's a very relevant piece of information, and I don't see a lot of posters sharing that.I see guys posting 150 RN over 9+ grains of trail boss going subsonic. I just loaded 7.9 grains and I am still supersonic. This is out of a 20" barrel, 1:12. Frustrated as all hell
I’ve never had to open up or use a flash hole deburring tool. Shoot your paper at distance to see when it will keyhole. The more you shoot the better (50-100). If you don’t get perfect circles, you may need to increase velocity or choose another bullet.1:10 twist do I need to still flasholes out?
You didn't mention it, so I'll jump in for good measure.Getting ready to load my first subs. My can come in 45 days does the below look okay?
DPMS Recon GII
Trail Boss start at 9.0 work up to 10.4
So I test with no can for speed and to make sure they are not tumbling correct?
Thanks for doing the leg work for me. Have same rifle.The First String was only 5rnds I was unable to get setup in time. I also was unable to reset between strings to the get the SD and ES numbers as well. This is without Suppressor, no keyholing at 100yards the 10.6 and 10.3 grouped the best all within 1.5inches for me.
Gun: DPMS GII Recon 16inch Factory Barrel
Hornady Brass TTL. 2.005
Flash Hole Resized
FL Resized and Neck Resized to: .332
178grn Hornady ELX Match
CCI Large Rifle Primer
Measure 10ft From Barrel to Chrono
1022.5 Baro Pressure
27.4 Wet Bulb
88.5 Rel Humidity
-245 flt Altittude
10.6grain Trail Boss
Avg Velocity: 1053
10.3grn Trail Boss
10.0grain Trail Boss
9.7grains Trail Boss
I’d go right to 10.0 with the 190s personally, but I’ll bet you end up around 9.5gr. With a 20” barrel 10.0gr was a bit fast still, so I went to 9.5gr. Same barrel at 16” gives me around 1050fps with moly’d 170gr FP and 10.0gr.this thread is awesome but a mess!
i just started loading for my FN SPR with 1/10 twist 24 bbl. 308. using my ultra 7 30cal (no i did not shoot them with the can on it initially)
i started from the only manual i saw from hodgedon. i used 155 palma bullets and 12 grains of trailboss then 11 grains.
12 was going 1436 AV
11 was 1357 AV
i have a ton of 190's to try. i think i'll start with 11 grains and then try 10.