I got my scope all mounted up today. I used a Burris ARpepr 1 piece extended scope mount 30mm to mount my Vortex Viper 6.5-20x44 30mm tube scope. Torqued everything down like the instructions said and then did my old fashion bore sighting. Look through the barrel at a spot on the wall across the room and adjust the scope to the spot. Discovered that I did not have enough adjustment so I had to unscrew the 12 screws that are on the rings and place some shims I made out of aluminum flashing material under the rear ring. I used three thicknesses. Replaced the scope and leveled everything once again and screw and torqued the ring screws back down. It then adjusted to my spot on the wall but not sure I shimmed enough. I will find out once I get to the range and see where I am shooting and how much adjustment I will have left.
Caved in to the craving for a 6.5 Grendel.
- Thread starter RT2506
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You may not need the shims. Remember that with that mount on an AR, you are probably at least 2 inches above the bore with optic centerline. Sighted to hit at POA at 100 yds, you will probably be hitting 2 inches low at a wall across the room.
MudRunner2005
Well-Known Member
For bore-sighting my AR's and adjusting pistol sights, this is what I use... Depending on how far you can get the dot from you, you can get it pretty **** close.
https://www.midwayusa.com/product/8...en-laser-bore-sight-17-50-caliber-20-12-gauge
https://www.midwayusa.com/product/8...en-laser-bore-sight-17-50-caliber-20-12-gauge
Georgiashooter
Well-Known Member
you should probably go ahead and take them out. Bore sight at 100 yds. Old fashioned way. No way you should be short on elevation with that scope/mount combo.
Went to the range today. Right now I will have almost all of the elevation adjustment available on my scope with the shims left on. That is the good news. The bad news is right now with factory Hornady 123 SST ammo I have a 6.5 Grendel SHOTGUN. I am a very experienced rifle shot so it is not me. Right now average 5 shot groups at 100 yards are 5 INCHES. It is almost like every shot is a flyer. One above where you aim the next to the right the next maybe to the left then the next below. I cleaned the bore really well before I went to the range. Man that Wolf ammo that they tested the upper with is DIRTY. I put 29 rounds down the bore today. I came home and really cleaned the bore again. I got quite a bit of jacket flecks out of the bore and a little bit of blue when I used shooter choice copper remover. I hope it is just that this rifle does not like this factory ammo or it just needs shooting to come in.
MudRunner2005
Well-Known Member
Send it back and get you an Aero Precision upper. Aero builds alot of upper & lower aluminum parts for Rainier Arms (not barrels), and their parts are high-quality. From what I've heard, the Aero barrels are pretty nice. I'd give them a look, if you get a refund. For the money, it would be hard to beat.
https://aeroprecisionusa.com/m4e1-enhanced-complete-upper-20-6-5-grendel-ss-barrel.html
rscottb
Well-Known Member
65grendel.com has much more specifics about your Grendel. Ballistic Advantage is a subsidiary of AeroPrecision and makes the barrels.
I would go back and remount the scope, but first, try some iron sights before you can farther. You were shimming and not knowing why or if you needed to, plus the specifics are vague. I never had to shim anything when I mounted an AR platform with a AR platform scope mount. What are your toque specs for the rings and base? Shimming unsymmetrical and/or not using a toque wrench and/or over torquing could have left the scope tube.....
I would go back and remount the scope, but first, try some iron sights before you can farther. You were shimming and not knowing why or if you needed to, plus the specifics are vague. I never had to shim anything when I mounted an AR platform with a AR platform scope mount. What are your toque specs for the rings and base? Shimming unsymmetrical and/or not using a toque wrench and/or over torquing could have left the scope tube.....
I cleaned the bore good. I went back and re-mounted the scope completely. Removed the shims and torqued the Burris base to 60 inch pounds and ring screws to 20 inch pounds like the instructions say. I went back to the range and fired 3 shots at 25 yards to get on paper and then went to 100 yards. I fired from a front press with rear bag on a solid benchrest set up. I fired the first shot and it was on the target so I did not adjust any but just wanted to see if it would group. SAME OLD 5" GROUP. Sent BCA a fax of my invoice from Primary Arms that they requested when I called them last Friday 3-2-18 and they said that they would send me a UPS pick up ticket. I have not gotten the ticket yet. After the mail runs today if the pick up ticket does not come I will be calling BCA again. I am really getting PO'd with BCA. By the way I was firing the upper using my Bushmaster lower that has a 3 lb CMC trigger in it. After I shot this Grendel I took my beater AR 223 Anderson lower with military 6lb trigger and Stoner A4 upper that has a cheap weaver 3-9x32 scope on it and fired a 7/8" 5 shot group at 100 testing a new load with 55 gr Hornady sp with RL7 powder so it AIN'T the problem with the shooter it is the BCA upper. I suspect the crown on the barrel is screwed up.
Clarkarchery
Member
123 sst give me great groups. A nickel covers the group at 200. But they are blowing up a little soon for me. Ill still use them on coyote and such but gonna test some others soon to see if I can get the same accuracy with more of a controlled expansion for pigs deer and others.
MudRunner2005
Well-Known Member
People get sick, but that's no excuse to not keep you updated. Sounds like some crappy customer service to me. You might be better off sending it back and building your own. I built mine from scratch...Built it the way I wanted, too. It **** sure wasn't cheap by any means because I didn't go the inexpensive route on anything...But I love it!
Mach 1
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I had a problem with a shilen barreled Grendel awhile back like what your going through. I would take the bolt out of the bcg and get a new bcg and put the bolt in the new bcg and then retest it. Mine went from 4 inch groups to around .75 to 1.15 inch groups at 100. Also i may catch flak over it but I've shot benchrest for a lot of years and no one uses hornady bullets. I use the 130 grain Berger tac bullets or 123gr sms bullets. H332 and xbr work well for me. I've heard some people like cfe 223 also. Just buy a box of hornady eld, berger vld, and sierra matchking bullets and then weigh them all. I would love to shoot hornady stuff as I have toured their plant that is only 2 hours from me but their bullets just don't stack up for me.
