I tried some factory 77gr TMKs, it wasn't pretty close to 2 MOA IIRC
Geissele Cut Rifled SPR Build and Barrel Evaluation. (Part 4 (Load Development 21MAR25)
- Thread starter Bigjake83
- Start date
I tried some factory 77gr TMKs, it wasn't pretty close to 2 MOA IIRC
It was the AAC 77gr TMKs, but I'll shoot if again just for you
I put the 1/2" red dots I shoot at 100rds on the boxes of ammo that don't work out, it also hated the 69gr AAC SMK's
When I take the 18" SPR out for load development I'll shoot every type of factory 5.56/.223 ammo I have on hand so y'all can see what she like and hates.
Keep in mind the AAC stuff isn't what I'd call consistent.
I just want to say... Thank you for all your time and effort, on all your posts.
All of us truly appreciate yours ( and many others ) lengthy, informative posts.
I look forward to this kind of "gunny" stuff every time I "login".
Lot to lot I have seen as much as a 100fps difference. Within lots seem to be fine though. Buy in bulk, zero for that lot, rezero for the next lot.It was the AAC 77gr TMKs, but I'll shoot if again just for you
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I put the 1/2" red dots I shoot at 100rds on the boxes of ammo that don't work out, it also hated the 69gr AAC SMK's
When I take the 18" SPR out for load development I'll shoot every type of factory 5.56/.223 ammo I have on hand so y'all can see what she like and hates.
Keep in mind the AAC stuff isn't what I'd call consistent.
@Bigjake83 how do you like the Xeno muzzle brake? I have one now that came with my Nomad, I made it direct thread, but thinking of moving it to my B&T to use on my semis for easier can swapping. See any downsides with the brake/can interface?
No Sir, no down side at all.
I started off with the Keymo Hub and Dead Air Muzzle break Set up and initially I really enjoyed it although it did add on a good amount of weight.
As time went on I started noticing that the CAN would come loose off of that last click creating just enough play to throw off the barrel harmonics and effect my accuracy.
I’ve swapped all my muzzle devices to Xeno now, the two Muzzle Devices that I run are extremely effective at what they do.
The Xeno utilizes left hand threads, I haven’t had one come loose yet on any of my Cans.
The Dead Air Muzzle Brake is a hybrid style muzzle brake that also does a great job at reducing Muzzle Flash, all of the Xeno muzzle devices are compact and lightweight.
I was initially a little skeptical because they all run a .30 caliber bore so I wasn't confident they would be effective at reducing felt recoil but they do a great job at it.
When you switch over from Keymo to Xeno you get to ditch that Ratchet Style Hub adapter that adds a significant amount of weight, the Hub Adapter for the Xeno is the same weight as a standard direct thread hub.
Dead Air Muzzle Brake: LEFT
LMT 4 Port Muzzle Brake: (NOT LEWIS & TOOL ) RIGHT
I use the Dead Air Xeno on all my SBR's in 5.56 and 6 ARC with 10.5" to 14.5" barrels.
The LMT 4 Port Muzzle Brake is extremely effective at reducing recoil, it lives on all my Large frame Rifles and a few Small Frames with 20" or longer barrels. You'll want the LMT 4 Port Muzzle Brake away from your ears
Hope this helps.
Jake.
Part 4: Load Development and Factory Ammo Testing
I've got my first round of Handloads to shoot today along with a good assortment of factory ammo.
HANDLOAD COMPONENTS:
77gr SMK
RAMSHOT TAC
STARLINE BRASS
CCI BR4 PRIMERS
Good Ejection pattern.
23.6gr TAC
24.2 TAC
Didn't realize I forgot to reset the chronograph until I was on shot #5
24.3 TAC
24.5gr TAC
Not sure who asked but here are two 20-round groups of Black Hills 5.56 77gr
I'll repeat the following loads for next Range Trip with 20rds of each.
I had a few flyers, shit happens. Should make @dms416 happy
knowing that I'm a mere mortal.
All groups were shot unsuppressed besides the last two 20rd Groups at the end.
23.6
24.2
24.3
24.5** 2753fps SD 9.2 / ES 21.8
And yes it still hates the AAC 77gr TMK's!
The 24.5gr of TAC really hit the sweet spot for Accuracy and Muzzle Velocity, matching the Black Hills 5.56 77gr.
I've got my first round of Handloads to shoot today along with a good assortment of factory ammo.
HANDLOAD COMPONENTS:
77gr SMK
RAMSHOT TAC
STARLINE BRASS
CCI BR4 PRIMERS
Good Ejection pattern.
23.6gr TAC
24.2 TAC
Didn't realize I forgot to reset the chronograph until I was on shot #5
24.3 TAC
24.5gr TAC
Not sure who asked but here are two 20-round groups of Black Hills 5.56 77gr
I'll repeat the following loads for next Range Trip with 20rds of each.
I had a few flyers, shit happens. Should make @dms416 happy
knowing that I'm a mere mortal.All groups were shot unsuppressed besides the last two 20rd Groups at the end.
23.6
24.2
24.3
24.5** 2753fps SD 9.2 / ES 21.8
And yes it still hates the AAC 77gr TMK's!
The 24.5gr of TAC really hit the sweet spot for Accuracy and Muzzle Velocity, matching the Black Hills 5.56 77gr.
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Load development results are up.
1st Handload Range Trip.
1st Handload Range Trip.
I might have one to sell , But have to buy my gas tube and AGB at cost tooInterested in doing some 77 TMK load development? I’ll send you a couple boxes if you sell me one of your 3 barrels at cost
Interested in doing some 77 TMK load development? I’ll send you a couple boxes if you sell me one of your 3 barrels at cost
Hard pass.
Well the SPR barrel is 18" so I'd say you could safely add 48fps, but keep in mind that you have a CLE Chamber. None of mine liked the Hot loads, my go to load for my CLE load is 77 SMK 23.5gr TAC, LC Brass and BR4 Primers.
I would start your load development at 23gr of TAC and work up 24gr it will be in that window, most Likely 23.5, 23.7 or 23.9
Here is the DOPE for my Pet Load out of the Geissele 18" SPR barrel.
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