Discussion in '6BR, 6BR Improved & Wildcats' started by Steelnecktie, Sep 7, 2017.
at 2920-2940 it might shoot .1s at 100 and screamer groups at 600,,
I tried velocity all the way down to 2900. Nothing looked even decent at 100. The only thing decent at 100 was fireforming loads, they were 1 ragged hole, after brass was fireformed, could not repeat it. I'm going back out this morning to test at 520yds, I've come to realize that it's just not going to shoot at 100 when tuned at 520. The only thing good to do at 100 is zero scope with this rifle.
I have all my notes from every shot down barrel, my groups at 100 were... .4 to.6MOA
31gr. @ 2900fps
31.3 @ 2930
31.6 @ 2960
31.9 @ 2990
32.2 @ 3012
Also tried jumping.030,.045,.060,
Tried jam .005, .010
Nothing besides fire forming load shot at 100yds. This is why I just went to 520yds and started testing.
To date, there are 233rds down barrel, going out this morning with annealed brass and see if annealing makes any difference at 520 with 3100fps load.
If it shoots .4 @ 100 you are right on the money at 500 2+ " a sub.1 gun at 500 should be .6 at 500 and 2+ at 1000...... better try rl-15 and or H4895. They shoot better...... Jim
I've had great luck with all the powders mentioned . Varget has been the most accurate the three in my barrel 7 twist .237 Mullerworks . Had a 2nd round impact at 1165 on a 12" Alloy Target gong with a 105 hybrid, .31.5 varget ,some GENIX primers .020 OTL using wheeler method with zero load developement with 1 firing on formed brass . I beat my shooting partner using his 300 win with 210VLDs . This little guy really is a laser-hammer!!
I've shot 5 shot groups with this load at 500 3 times under 1". I'm measuring 20 shot group with 4 to 7mph wind conditions switching on me at 2.5". Shot 20 rounds this morning just under 2.5" with vertical at 1.5" for all 20 rounds. I'm not the best at judging let-ups in wind conditions.
I am going to get some H4895 to try, seems like the go-to powder for this cartridge. How is it on barrels compared to Varget?
Don't be afraid of RL-15 Roger just set a record with it at Williamsport with a BR imp at 1000...... Jim
Got some H4895, maybe get to load a few tomorrow and shoot a couple groups. Loaded a few tonight to test, 31gr is running 3020fps. It was showing more pressure than Varget at 3100fps. Guess I'll be testing the 2900-3000 nodes with H4895.
I will say that the few test rounds I shot were already better accuracy at 125yds.
My gun really loves 31.0 gr H4895 (2990-ish). 105 Hybrid at .014 off touch, CCI450.
At long range F-Class competition this weekend in near ideal conditions....
Sorted: 150-12x @800, 150-9X@900 and 199-14x @1000 (Great vertical!)
Half the rounds sorted: 195-8x (96-1x, 99-7x)
Unsorted: 198-2x (This is actually hard to get just 2x's out of 20 and still score 198)
One thing I learned this weekend the hard way..
I will never shoot another competition without sorting my 105 Hybrids.
It might not matter at mid range, but for long range...
Well, looks like 30.6gr. of H4895 is running at 2965fps. This testing at 125yds.
30.5gr. = .25MOA
30.6gr. = .1MOA
30.7gr. = .25MOA
I'll have to go out to 500yds and shoot a ladder and do more testing next month, time to go back to work.
So what is your guys thoughts on this? Not proven yet at 500, but to be continued......
Seems light, I and a lot shoot 31.1with a fed. 205, does real good there but again I'm shooting a 103 and a 26" barrel at 2974 ...... Jim
Do you really have a good statistical sample, I bet if you went out and shot them again... you might get .25, .25, .15 MOA... I have found that the tuning window is pretty large...
You didn't state what bullet and depth you are using..
And see my post about sorting if you go long or are trying to squeak out all accuracy.
I'm showing pressure with 31 gns of H4895 also and the 105s hybrids . My lot of H4895 is around 6 years old and its still 103 degrees out, 4895 has been the fast out r15 ,varget,h4895.
I haven't went into the sorting thing, just grab what is in the 500ct. box. I'm running Berger 105 VLD hunting jammed .005" past touching
Just went out and shot couple 5 shot groups at 500yds with 30.6gr. Wow, holding under .25 MOA each group. Vertical on 1 group was 1/4", wind switching had my horizontal just over 1".
Shot a ladder from 30.0 to 30.8, according to the ladder, I'm perfect with the 30.6gr. The 30.3 to 30.8 was 1" vertical, 30.0 to 30.3 was 2.25" vertical.
Which brings up another question???????
The ladders I've shot with both powders are with bullets that are colored differently with a Sharpie. All loads with Sharpie colors are pretty consistent at 35fps slower than a naked bullet. So question is, do you go by what the 35fps slower ladder says or shoot naked bullets and decipher hits some other way?
Just FYI I'm using labradar for velocity and sartorious entris i64 annalitical scale for powder measurements. There is no doubt as to my reading are true.
Are you using standard Sharpies? Sinclair has the low drag Sharpies.
Just when I thought I've heard it all. Lol
I have quite a few running 30.6. Different barrels, different powder lots, who knows, but its a common load like 31.1 is.
So, what's you and @tom take on the 35fps slower muzzle velocity with Sharpie? I know Tom test a lot at 1000, how are you guys getting around this? Are you just going with the powder charge that looks good with slower Sharpie speeds or you running camera system to verify hits with naked bullets?
I color from the tip to ogive. I dont color the shank of the bullet. I have never seen velocity change with colored bullets. All of my experience with chronys makes be base little to nothing on the numbers they give me.
Yes, "just the tip" lol.
I also don't notice a change, but for good measure use black in placed of naked.
Gotcha, I was coloring down onto body of bullet too, I'll just try ogive out to tip. I knew you guys would have the answer.
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