i joined the darkside 6 arc build

[mel80]

lots of results today all @ 200

80g sierra spbt blitz 5rd 30.1g of 2000-mr black dot was a sighter for remounting of scope

at 2900 fps


onto the 75's all 75's are 3 rd groups
ur going to see a pattern here witht he 75's the barrel just loves theese bullets no matter what the charge is
75g sierra flat base hp's 31.2g of 2000-mr

[mel80]

75g sierra flat base hp's 31.4g of 2000-mr



75g sierra flat base hp's 31.6g of 2000-mr

[mel80]

75g sierra flat base hp's 31.6g of 2000-mr this one is the winner



75g sierra flat base hp's 31.8g of 2000-mr

[mel80]

and last but not least
75g sierra flat base hp's 32.0g of 2000-mr

[jetinteriorguy]

Wow, how often do you get that. It’s always nice when a gun just shoots, I had one about 45 years ago and sold it to a friend. He gave it to his grandfather as a gift, and I didn’t mind since his grandfather had a special place in my life.

[mel80]

i couldnt bellive it when i shot those today that barrel just flat out loves that bullet and powder combo , though u couldnt go wrong with any of those charges tested but 31.6 is deffinatly the clear winner.

i have a pair of 12inch 6arc barrels on the way from the same manufacture i cant wait to try those out

[stagpanther]

I tried to approximate the numbers in QL (which for reasons unknown has never listed 2000MR)--looks like it should be a soft-shooting mild pressure load to boot. It worked very well for my 224 valk loads. I did some tests with CFE 223 which also looked pretty promising in the ARC--they were a bit under MOA but not nearly as tight as your groups which look under .25 MOA.

Another thing I found out is that Hornady's modified case does not work well with their OAL gauges-- the screw-on stub is too long to allow bullets to be started well inside the case, so I had to ground one of them down to get a better fit.

[mel80]

Originally Posted by stagpanther

I tried to approximate the numbers in QL (which for reasons unknown has never listed 2000MR)--looks like it should be a soft-shooting mild pressure load to boot. It worked very well for my 224 valk loads. I did some tests with CFE 223 which also looked pretty promising in the ARC--they were a bit under MOA but not nearly as tight as your groups which look under .25 MOA.

Another thing I found out is that Hornady's modified case does not work well with their OAL gauges-- the screw-on stub is too long to allow bullets to be started well inside the case, so I had to ground one of them down to get a better fit.

hornady doesnt list 2000-mr for the 75g bullets so i studied the 80g and up data to see the maxes for each bullet wieght and came up with 32g being about max for the 75g , even at 31.8g the cases look brand new and the cci 400 primers look perfect granted im using converted 6.5 grendel brass

the velocity change over my 5 groups of testing was almost 200 fps with the low side being 2860 to 3040 over a 1g powder difference , thats a bit of a jump from what im used to with the grendel seeing only about a 10 fps gain per .1 g of powder, granted this is my first go really with 2000-mr i did try it in my custom barreled grendel briefly but it was short lived when i wasnt seeing the mv's i wanted out of it

i did load some converted x39 brass( was originally converted from x39 to 6.5 grendel) @ 31.2g last night with the 75's and the powder was up into the neck and compressed when seating the bullet , but those cases havent been fire formed yet.thinking about pulling those down and droping the powder charge to 29/29.5g for the fire forming step

[stagpanther]

It's a slower burning powder than the other ones you've used, I found it best with heavy bullets in my 224 valk. I have some 95 TMK's in 6mm and may try the 2000MR on them for the ARC

[mel80]

i got to test out theese speer 75g hp's today

shot a large jack rabbit at 154y and there was nothing left it was like his ass was sitting on a pound of tannerite
this is deffinatly one nasty varmint/predator round if u dont care about fur

i need to get my hands on a gel block and see how theese would work for an sd round out of a short barrel

[jetinteriorguy]

Those HP’s just look wicked. Old Bugs didn’t stand a chance. The .22 I inherited from my dad was paid for by collecting bounty on jackrabbits back in the late 40’s. But all he needed was a pair of ears to collect the money. I believe he got a nickel apiece, and when he shot 50 rounds he had 50 rabbits most of the time. To this day that rifle is still deadly accurate.

[mel80]

i cant wait to try them out on larger critters maybe this weekend ill go out and see if i cant bag/explode some racoons the cavity on the front of theese is about .235 deep and is all jacket

[mel80]

i just converted/loaded all of my geco x39 brass from 6.5 gren to 6mm arc , for the fireforming step ive loaded them with some 90g sierra fmj gamekings that i had with 29g of 6.5 staball and a federal 210 primer it going to be slow af but sinc ei have 20+ pounds of the stuff its perfect for the ff step instead of using up the good powders i have. ill see how it works tommorow when i get out of work ill prolly chrono a few rounds just for ████s n giggles

hogdon says a 100/103g bullet with 30.7g of 6.5 staball = 49.8K presure and 2600 fps so i should be more then safe

the interesting thing is hogdon shows 65 staball beating out all other arc powders except ppv and 2000-mr which shows as slightly behind 6.5 staball with the 110-115g bullets so if i ever decide to buy some lr target bullets like the 110 a-tip or the 115 rdf ill have to do some testing

[stagpanther]

Staball I've found to be a stellar powder--especially in midsize rifle cartridges like 270 win. Consistent performance in a wide range of temperatures, easy on the fouling and in my experience does tend to produce faster velocities than other similar powders. I never thought about trying in a small cartridge like the Grendel.

[mel80]

i loaded some 85g varmint/predator rounds for my cm with 6.5 staball but its been about 3 months since and still havent taken it to the range to see how they do, i only take my cm out a few times a year if that anymore , with as much as that powder as i have figured it wouldnt hurt to burn some up it up for fireforming some brass lol .

maybe this year ill build my 6.5-06 or 6mm-06

[stagpanther]

I don't have either of those 06's--but I do have a 25-06, which is an awesome quarter-bore cartridge.

[mel80]

new build comming this week 6mm arc with a 12 inch barrel also on the way is a new bolt that i am doing some testing for for the manufacture, ill be using this bolt in the arc and the 28inch grendel to see how far i can push the bolt , be really nice if i can safely gain another 100 fps out of that 28" grendel barrel , for the arc ill use the gas gun and bolt gun data and venture that to a nice happy medium between the listed gas gun and bolt gun max pressure loads

between the gas gun and bolt gun data it follows about 1g difference in powder roughly some bullet wieghts varying about 1.5g to go from 52k to 62k psi im hoping to test this bolt long term at around 58k psi

theese bolts should have been available this week but there was an issue with the extractor hitting on manual cycling but works fine on firing so they are not selling the bolts till they sort the extractor issue , im willing to deal with the small extractor issue for testing

[stagpanther]

I have a heavy duty bolt that I use on a Grendel build and tried it on my arc but it wouldn't lock up completely to the extension. I didn't polish the lugs since it works with my Grendel barrel.

[mel80]

well 6.5 staball works in the arc
used it to fireform some 7.62x39 brass today and accuracy with the un fireformed brass and staball was suprising
@100y


now that the cases are fireformed i need to shoot a ladder with them and get some chrono data , 6.5 staball and the 90g fmj might make a nice very soft shooting close to midrange sd load

[mel80]

ima take this rifle out hunting tommorow on my day off see if i cant get my first yote with it

im going to run those sieraa fb 75g hps and see how they do , i really wanted to run the 12" build but i dont want to switch it out of its current sd gun config

[mel80]

5 rds @200 and 1 rd with supressor off to check poi shift , then 5 more with supressor remounted to check zero again


75g sierra flat base hp's over 31.6g of 2000-mr in converted hornady 6.5 grendel brass

[mel80]

got 7 of theese lil guys at 80-190 yards in an hour , and then went back out that night and got my arcs first yote at 472y , ill post up the vids as i get them all uploaded

[mel80]

did a quick test of theese speer #1205 75g varmint hp's today at 31.2-31.4-31.6-31.8g of 2000-mr


was quite a bit windy today and i think i need to retest but heres the results at 203yards off the bipod
starting at 3 oclock and moving clockwise
need to shoot .4 and .6 again on a calmer day was pretty windy and very gusty today

[mel80]

score !!!!!!!