Home Forums Hunting & Shooting AR and Tactical Rifles 6mm arc loads

Kaiser,

The .243" 105 Hornie's HPBT's Robustitude,do it many Critterly Favors and I rather love it across a spectrum of relative "intensity" chamberings. That from 270 and 6PPC Alaskan Fhuqking Improved to 6-284 and Six-TwatSix. Hint.




Terminal Effects are easily banked upon,throughout the gamut and I typically default to 'em in a goodly smattering of rifles. Hint..................






'24,

Are you crimping? I don't(on anything). Hint.

The vertical SCREAMS "mechanical",which ain't ammo. Hint.......................

Nope, no crimp. I quit crimping anything years ago too. 105s at mag length, federal primers, starline 2x brass. I will check my scope rings and scope riser (a Weaver USA 20 moa).

Edit to add, handguard is free floated and the gas block isn't touching either. Gas block is actually exposed at the end of the handguard.

What is the current optic? I'll not fret primers,but Federal has never been my jam. Hint.

I've zero concerns with a nekked 'block,risers very typically are fine,if all are mounted on the receiver and nothing is supported on the rail...assuming all is tight. Hint.

Could be sling stud sweep,under recoil,kicking vertical. Hint.

Ammo simply can't/won't/don't string in such a manner,with components as you've described. Hint.....................

Optic is a brand new Athlon Ares BTR Gen 2 4.5-27. Everything is screwed down tight and loctited.

Barrel nut is torqued to 45 pounds if I remember right. I will load some more lever and re-shoot, and concentrate on my form and breathing and see if it is just me.

If I keep getting weird fliers and vertical stringing I may put a few more pounds of torque on the barrel nut or swap scopes.

Barrel nuts don't induce vertical,though Optics certainly can. Hint.

PROVE a scope first,rather than putting TRUST in it blindly. You'll save alotta time and components,via simplistic confirmation(s). Hint.

It ain't ammo. Hint...................

Check vertical parallax by moving your eye up & down while looking through. I had an Athlon with 3 MOA of vertical parallax that couldn't be adjusted out.

I am gonna load some more rounds and do a tall turret test and will check parallax better. I kinda half-ass checked parallax the other day but didn't pay a whole lot of attention to it. Will check it closely next time I go to the range.

Will also pay more attention to breathing and form.

Not sure what to make of this. I started at zero, then went up 5, 10, 20, and 30 moa. Then over right 10 moa, and back down, then back to the beginning. I shot 6 shots at +10 moa because I fugged up and pulled the first three.

Everything is consistently left about a half inch, which is fine, my zero to begin with was probably left a half inch. BUT the two 20 moa groups were both right a half inch from everything else. Coincidence?

Plus, I think I'm still getting some vertical. My parallax is rock solid at 100 and I took my time and concentrated more on form.

Again...you are fighting MECHANICAL,not ammo. Hint.(grin)

Start at zero,then flog on the erector,all the way to the erector's elevation limit and back to zero,while shifting zoom along the way and then gun a 30 MOA correction. Rinse/repeat,rather than trying to read "input" from a lineal trickle ascent adjustment. Make the fhuqking thing PROVE itself. Hint.

NEVER trust glass,until you've PROVEN it's performance. You'll save more than a wee bit on ammo components and then be able to critique accuracy/precision. Less that,all bets are off,as you are experiencing. Hint.

Is reticle square to turrets? Hint.

Start At The Fhuqking Start and scratch schit OFF The List,rather than adding to same,less rhyme/reason. Hint....................

I will give that a shot and see what happens next time I hit the range.

I dialed an assload of elevation up and down into my scope multiple times very quickly, bottoming out on both the top end and bottom end multiple times, and then got this at 30 moa. Similar result dialing all over the place at 20. I think my scope is okay. I may try some 108 grain elds and see if I can get tighter groups.

The primer pockets in my Starline grendel brass are about toast on the fifth loading. Primers aren't falling out but they are really loose.

Haven't given up on the 105 bthp just yet. Will try a few test rounds of PowerPro Varmint and AA 2520.

I also loosened and re-torqued my barrel at 55 pounds. Will also try a few more 105s with Lever and the torque adjustment.

I found a load my 6 ARC likes so far. 28.2 grains of LeverRevolution and 95 gr. Hornady SST’s. I got a .50” 5 shot group at 100 yards today. I also got a decent grouping with 27.4 gr as well, it not as small as with the 28.2 gr. I will load up more and see if I can repeat.

On the right, a max load of PowerPro Varmint with a 105. Left, three tenths below max. None were cold shots. Barrel was warmed up but not hot.

I am going to swap scope and mount with a known good one and see if the weird vertical goes away. I'm pretty much convinced the rifle is sound. I thought the scope was too, but this is getting ridiculous.

I have a box of 95 SST around here somewhere, will try some of those with Lever eventually if I can ever convince myself the rig is sound, top to bottom.

105 with a max load of AA 2520, right. Three tenths below max, left. Another powder to look at with the heavies.

Auk1124,

The first powder I bought to reload for my ARC with was Accurate 2520. Needless to say, I still haven’t opened it.

I mounted a known-quantity scope tonight and will try a few more 105s with it, just to compare to what I've been getting with the original scope. If things don't improve, I will try some 108s and some 95 SSTs with Lever. Seems to be working great for you.

Hornady 95 grain SSTs seated to the lands, worn out brass, cci 400. Leverevolution. Left is 28.8 grains, right is 29.1 grains. 29.1 gave me a .75 inch group for five.

Hotter loads gave me worse groups.

Similar results with 95 SSTs and CFE 223. 28.8 grains, about a 0.8 inch group.

Auk,

Looks like you might be on to something there. I plan on working with A2520 and 105 gr Hornady Match bullets next.