Hate that my pictures come out upside or side ways. So I guess the second picture is .5moa and I actually shot several groups at 1 moa or less and 3 at .5. Does that tell you they are good or does that not mean much?
I did not have time today test terminal ballistics. Sure knocked the crap out of the rocks tho. Lol
I was disappointed today that my 6.5 SS chambering will be delayed for a couple of weeks as I wanted to shoot a "Bar" with the Matrix. I decided to pull the 6.5 Sherman out of mothballs and give it a try. I loaded up some worn out brass with Retumbo and BR2's in WW cases. This rifle has over 1500 rounds through it. I had a gusty crosswind around 25 mph and my rest is placed under a large fir tree which causes the cross hairs to move back and forth from the root movement when it's windy. Anyway, now that the excuses are covered, I fired three rounds with the bullets seated just into the lands. The results were rather disappointing (about 1 1/2" group). I tried another group jumping them about .030" with approx. the same results. Hmmmmm? Maybe this rifle doesn't like the 160's, or maybe worse, the barrel is going south? I remembered Cliff shooting his Sherman (posted earlier) with some pretty good results at about .090" off the lands so I thought it was worth a try. I fired away and presto; good looking group. I loaded up three more the same to see if it was an accident and fired again. Same result! I plan on going out again before long with some new brass and try tweaking the load to see if I can improve any. After that is determined, I want to shoot some at distance and maybe run an expansion test. I'll be anxious to see what some of you other guys find out. Here is a pic of the group. I was jumping the bullets between .080-.090". I didn't take a precise measurement......Rich
Thanks for the good info Brent, i just loaded up some rounds with retumbo in my 6.5x284, 5 at 50 grains (fouling shots, cleaned out copper last cleaning), 3 at 51, 51.5, 52, 52.5, and 53 grains seated .264" off the lands, i can seat farther out but .264" off the lands is 20 thou shorter than the MAX oal that i can eject a live round without pulling the bolt. I could seat out to an OAL of 3.397 and be at the lands but 3.153" is the longest i can eject a live round (the rounds i have loaded now are at 3.133 Base to tip.). Hopefully i can make it out to the range either this weekend or next.
I'm 15 "Firearms are second only to the Constitution in importance; they are the peoples' liberty's teeth." ~George Washington
"The only advantage a light rifle has is weight, all other advantages go to the heavy rifle."
~ JE CUSTOM
Sounds like your rifle has a very long throat. Is that correct?
3.397 vs 2.606 is .791. So 3/4 of inch difference in our rifles. I dunno I am kind of amazed by this. You could shoot 200 gr vlds out of that bad boy.
I hope your testing goes well. Right now I am planning to mountain shoot Saturday. We are working up some 260 rounds and I want to stretch the 160's out in the 284 at the same time. If I am not memory challenged again I will take a test target of wet newspapers and shoot for expansion. Looking forward to it.
I am sure I missed it some where but what is the bearing surface of the 160? Wondering if there is a chance that we may see higher velocities than we think because of a shorter bearing surface, similar to how the 30 cal 215 vs 210 behave.