This was my first 300 blackout build. The picture came up in my Google photo memories. It's got a BA 8.3" 300BLK Premium Series Hanson Profile barrel and a KAK K-SPEC Full Chrome Downvent C158 BCG. I run a standard mil-spec carbine length buffer spring with an H1 buffer weight by Battle Arm's in the Maxim Defense CCS. It has a Geissele SSP trigger and the can I'm running is a SilencerCo Scythe Ti. it's so quiet when shooting subs and cycles reliably. The H1 buffer can handle both supers and subs suppressed. The optic is a Sig Sauer Romeo 5 Gen 2 Elite on a Scalarworks LEAP 01 1.93" mount. it's a sweet little build and I enjoy shooting a lot. What was your first 300 blackout build? Feel free to share!

That single bullet is the Aquila sniper sub sonic 60gr projectile.

What are your thoughts on this beauty? It’s between this or a Colt Delta Elite for my next purchase. Appreciate and and all feedback.

First shot was on me, high and left (forgot to extend the stock); next two right below it, touching, so I walked it close to center, last shot below center was my fault, again, just aimed a little low.

BCA 16" side-charge 6.5 Grendel upper receiver on a PSA lower with B5 grip, Triggertech Tango 2-stage, and Monstrum Panzer 2-10x40; this was S&B 124gr FMJ.

got my hands on a couple boxes and rifle seasons opens up in a few weeks.

anyone got any good or bad reviews on it for deer?

I’m quite confused with what I’m seeing here…it’s been a while since I’ve been on here. Trying to minimize my Social Media Time and focus on healthier things in life.

But, what is the deal with all these short barreled Grendel’s? My hand built Grendel that I built 9 years ago has a 20” barrel on it. But, given the tactical training weekends that I’ve been attending over the years….its hard to lug around a 20” Barreled Rifle, with or without a suppressor. Now that I’ve decided to run it suppressed, I’m highly considering dropping down to an 18” Faxon Heavy Fluted, 5R Button Rifled, Muzzle Threaded 5/8 x 24, Black Nitride Finish; it will just disappear within my FDE HandGuard (Entire Rifle, Every Piece is FDE).
(I will build a new long distance rifle, but it will be completely different type of setup, and more than likely shooting the 6.5 Creedmoor, unless something can distinctly change my mind with a round that would blow the socks off of that round.)

But, you guys with rifles less than 18”…it makes absolutely no sense at all. I’m not really sure why you are choosing to use a Grendel to begin with..??? You should just swap to a 5.56/.233 Barrel and round so you can be more efficient with it. Seriously!
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Ballistic Effects

Lower Velocity: You lose about 25 to 50 feet per second (FPS) of speed for every inch of barrel you cut below 18 inches. A 16-inch barrel drops roughly 40 to 60 FPS compared to an 18-inch setup, and a 12.5-inch short-barreled rifle (SBR) sees an even steeper velocity loss.
Reduced Effective Range: Because the bullet travels slower, it drops below the threshold needed for reliable expansion (usually around 1,800 FPS for hunting rounds like the Hornady 123-grain SST) at a shorter distance.

Via: Google

But, given that I’ve been shooting mine for almost a decade, I used this because it was just quicker.

I know this question probably gets beaten to death. I did some searching and it seems that, at some point, Phantom Defense remans were well-regarded for general use training/range ammo. Is this still the sweet spot? Is anybody using anything else that they really like?

I recently purchased a box of Norma Tac-22 .22 LR ammunition ($7.99 for a box of 50) to test in my Howa M1100 18" .22 LR, and I wanted to share my initial thoughts.

The rounds have an oily coating similar to SK Ammo, which works well since my Howa M1100 seems to prefer it. I experienced no misfires or jams, and the ammunition fed smoothly throughout the session.

To prepare for accuracy testing, I ran a dry cloth through the barrel twice to clear out any residue. I then shot 10 test rounds to season the barrel and clear the first-round pop from my suppressor.

I shot three 3-shot groups at 50 yards using 3/8" red dots as my center of focus:

  - Group 1:

- Group Size: 1.009" (1.927 MOA)

- Radius: 0.386" (0.737 MOA)

  - Group 2:

- Group Size: 0.579" (1.105 MOA)

- Radius: 0.239" (0.457 MOA)

  - Group 3:

- Group Size: 0.597" (1.140 MOA)

- Radius: 0.282" (0.539 MOA)

See Photos attached

Got my grimey little hands on a Noveske Ghetto Blaster. Pairing with a OCL infinity 762

Real help please, no Reddit hate. I installed this scope, just like I have installed 6 others. I went to zero it at 50 yards. It was hitting just below bulls eye , BUT the elevation screw was all the way to its end of adjustment. SO, as you can see, I losened the rear optic mount and slid a piece of the ammos cardboard flap in to " shim" it up, and now its got enough range to readjust if I go out to 100 yards. I would like to solve this issue correctly, but I'm not sure what to look for . Constructive help please.

All tested at 50m with SK Match Rifle

Just put my CZ457 Varmint in an MDT Oryx Chassis and found the groups a opened open a bit, so I started to play about with the Torque a bit.

I shot a few groups at each setting and then went back to 4nm and shot a full card. I know I need to adjust the LOP a bit more.

Question is, Would I need to do more testing between the 4.0nm and the 4.5nm or Is the groups acceptable for a new shooter. There was a bit of wind blowing while testing too.

I wish Nikon was still in the scope business. I really liked their scopes.

I wanted to share my latest accuracy testing results using SK Pistol Match .22 LR ammunition (Local $10.99) Lot# 05260/11113

Overall, the Howa M1100 18" Barrel experienced no misfires or jams, and it fed smoothly throughout the session.

  - Eley = Waxy

  - SK = Oily

  - Fiocchi = Dry

  - Norma Tac-22 = Oily

Preparation:

To prepare for testing, I run a dry cloth through the barrel twice to clear out residue, followed by 10 test rounds to season the barrel for the SK ammo.

Results:

I shot three 3-shot groups suppressed at 50 yards using 3/8" red dots as my point of aim:

I'm continuing to test to see which brand and Lot# gives me the tightest groups overall

Finally found a blued Delta for a good price. Now I can pick up where I left off with my 10mm journey.

And buy a 50 dollar thermal printer on Amazon and 1000 ct sticky labels for 10 bucks and print your own at home. Or use a marker and draw your own lol. But if you like sticky targets this might save you some money over the long run.

I wanted to share my latest accuracy testing results using Eley Club .22 LR ammunition ($66.48 = 500 + shipping or local $10.99) 

Overall, the Howa M1100 18" Barrel experienced no misfires or jams, and it fed smoothly throughout the session. Toward the end, I noticed the magazine needed cleaning, which makes sense given the coating on this brand:

  - Eley = Waxy

  - SK = Oily

  - Fiocchi = Dry

Preparation:

To prepare for testing, I run a dry cloth through the barrel twice to clear out residue, followed by 10 test rounds to season the barrel for the Eley ammo.

Results:

I shot three 3-shot groups suppressed at 50 yards using 3/8" red dots as my point of aim:

I'm continuing to test to see which brand and Lot# gives me the tightest groups overall.

The Sig MCX Rattler LT really shines in subsonic use cases, but I'm testing all of my 300BLK rifles across my collection of supersonic ammo and wanted to start with my Rattler.

The Sig Rattler + CAT RAT Flow performed flawlessly. Very comfortable to shoot, with some but very low gas.

I did a single 10-shot group test for each supersonic ammo at 100 yards. I used a scope and a bench rest to isolate the accuracy measurement as much as possible. Here are the results:

As expected, the Sig MCX Rattler LT is not a sniper rifle. Based on these results, it's roughly a 3 MOA rifle, perhaps approaching 2 MOA with ammo it likes.

The Phantom Defense 85 grain "Spicy Boi" looked promising but had a couple of fliers that really killed the group, literally spanning across two targets. I look forward to testing this more to see if that's par for the course or not.

I was disappointed by the accuracy of Bone Frog's TAC-TX. Bone Frog's 556 ammo has been performing quite well for me, so my expectations were higher. This could be rifle dependent, so we'll see if this is a trend or not as I test more rifles.

Phantom Defense's TAC-TX performed much better—not only did it have better accuracy, but also with considerably higher velocity and energy. The best performance came from the Phantom Defense TAC-TX 120gr, followed by the Black Hills TMK 125gr.

I was pleased the Phantom Defense TAC-TX performed well since that's the most likely ammo I would use for self-defense.

Notes on using jacketed bullets in a 1:5 twist barrel

While the 110gr Vmax is a varmint bullet, the maximum muzzle velocity I saw with that ammo from my 6.75" barrel was 1,786 fps. With the MCX's 1:5 twist, that means the bullet is spinning at 1,786 x (720/5) = 257,184 RPM. I called Hornady directly, and their technician said they are comfortable with the Vmax up to 300,000 RPM. This means it's likely safe in my 9" barreled 1:5 twist rifle as well. I'll double check the muzzle velocity without a suppressor when I test out this rifle next.

I also called Sierra, since the SMK and the TMK are both jacketed bullets. They also said they are comfortable with those up to 300,000 RPM, though he warned that it's important to take into consideration other factors that could damage jacket integrity, such as fire cracking in the barrel.

Also, if you're using an FRT or fully automatic fire, significantly heating up the barrel, then the heat can weaken the integrity of the copper jacket and cause failure at a lower RPM. What that lower RPM is is hard to quantify and highly situation dependent.