Its looking like 29.6 and 29.7gr of RL7 is going to be the sweet spot with formed and once fired 6.8 brass. Im liking the once fired 6.8 brass due to the shoulder being further fwd than new brass. Gonna shoot these 2 charges for speed next. I expected to see some pressure signs at 29.8 grs but im really not getting any. Im using a 16" barrel by the way
Shot 2 groups today ( just the 2/ 29.6 groups)for speed. 29.6 is running 2631,2651,2648 and a solid half inch group. Ive shot this charge several times and its very consistent with SSA once first 6.8 brass. For shitz and grins I shot the same charge with formed SSA brass and it shot 2658,2655,2651. While the groups aren't as tight and a tiny bit faster they are hitting in the same area. The small flyer could have been me but its still moa. Also notice 26.7gr is a nice group as well but I haven't shot that thru the chrono yet. This data puts the AM30 performance above the 6.8 in my book. Not by much but it does do the job accuratly
No im not getting really anything to worry about even at 29.8 the cases looked fine. The only thing I noticed was a tiny bit of flatting and just very faint imprint of the ejector. I plan on shooting 30 gr tomorrow which should shed some more light on them. 29.8 is definatly not pushing these in my barrel. I thought they would but nope.be cool the hit 2700fps safely and im close to it with phenominol accuracy
Thank you for the response. Look forward to your next report. I'm shifting to my 20" 6x45mm BHW barreled AR now. The American 30 bumped it out of the rotation and I need to work up some loads for it. Going to be mostly working on 85-87 grain projectile. It's always something with us Wildcatters.
Post by mosigdude on Sept 10, 2015 14:15:30 GMT -8
I got to go out and play for a few rounds today. One of my test loads was also with RL7 and the Nosler 125 Ballistic Tip, I'm using the Federal pull-down brass which is all 1x-fired now (since my original form) and have switched over to the CCI450 primers from the Rem 7-1/2's that I was using. I didn't chronograph today but I'm about a grain less than you and shooting an 18" tube, my previous tests put this one in the mid-2500's. This is only a 3-shot group at 100 instead of my usual 200, but I think it has potential.
I also did another run with the same brass/primer as above except using a workup of H335, below is the best of the day on this workup, also another 3-shot at 100 and also mid 2500's in velocity. I'll stretch both of these out to 200 to decide which I'm keeping later. As I talked about in another post, I''m fighting with the function on the RL7 but it sure is easier to fit in the case, if I can get the function worked out and accuracy remains at 200 it will be a no-brainer.
Post by mosigdude on Sept 12, 2015 13:38:07 GMT -8
I don't have my notes in front of me right now but I was seeing what I thought was the beginning of pressure signs a little under where you are but that was also on newly formed brass that didn't fit the chamber exact yet, I might have had the case head slamming into the bolt giving false sign, I may work up again with 1x fired brass to see what it looks like now, If I could run better than 1/2 MOA in the 2600's+ I'd be thrilled!
Edit - Made it home to my notes, 29.6 is where I was starting to see the possible beginning of pressure signs, this was with the first-formed Federal brass and Rem 7-1/2. My speeds were on par with yours, except out of an 18" tube, barrel length may not be much of an advantage out of this one, or possibly the case capacity differences between your brass and mine make up for it. Either way, I'll revisit these soon with my 1x-fired brass.
Last Edit: Sept 13, 2015 9:31:10 GMT -8 by mosigdude