Loads for AR pistol

[ubet]

Just ordered one today with 1:7 twist 11.5” barrel. Are you guys using 77 or 62 Grs for sd rounds? And what bullet are you using?


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[motor51]

I’ve been using 55gr federal bonded LE rounds but would love to try a few MK262 77gr


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[SBRSarge]

Federal bonded LE loads (both the FBI and I prefer 62gr), any load with Barnes TSX (again, I prefer 62gr), Hornady 75gr SBR, MK262 Mod1 or clone...

Selection Process
1- Buy some of each of the above, and any others you wish to try, and see which one your gun likes.

2- Buy a stock of that load.

3- Buy lots of practice loads so you can put your selected load where it needs to go.

Number 3 is the most important.

[ubet]

I guess I wasn’t super clear. I roll my own. So am a little limited in the department as far as some selection on bullets.


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[markm]

77 gr OTMs or 77 gr TMK. Both fragment well in short guns. I like XBR or H322 pushed a little over max based on your own work up.

[ubet]

77 gr OTMs or 77 gr TMK. Both fragment well in short guns. I like XBR or H322 pushed a little over max based on your own work up.

Thanks. I have 1000 75gr hpbt to load and a bunch of 77smk loaded up for my ar. Maybe I’ll get lucky and the pistol will shoot that the current loading of smk decent enough. Are you looking for a specific muzzle velocity, what are you looking for when building rounds for an ar pistol?


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[markm]

what are you looking for when building rounds for an ar pistol?


We don't have any AR Pistols specifically, but SBRs down to 10.3. I really just build the load off of a 20" bolt gun so my velocity comparisons are apples to apples. If it's a stout load on the 20", it should be fine on the shorties since we don't run slow burn powders for any AR ammo.

[Roscoe_762]

Just ordered one today with 1:7 twist 11.5” barrel. Are you guys using 77 or 62 Grs for sd rounds? And what bullet are you using?


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I'm using a Mk262 Mod 1 clone round (77gr) in my 10.5" 1/7 pistol build that's styled after a Mk18 Mod 0. The SmallArmsSolutions ammo test has some terminal ballistic comparisons of this round from barrel lengths of 10.5"" through 20" and performance is impressive across the board. I load mine with 77gr SMKs or Noslers, over 23.8 or 24.0gr of 8208 XBR, LC brass and Rem 7-1/2 primers. MV averages around 2,780fps at 23.8gr with SDs around 10 and 3/4-MOA groups from my Mk12 Mod 1 (18" barrel). Accuracy is a little better at 24.0gr, but it's hot! I haven't checked velocity through the 10.5" pistol, but it should equal or exceed the Black Hills round - YMMV.

I'm also considering solids for better penetration, primarily the 62gr Barnes TSX, but can't find any in stock. I have some 70gr GMX solids to tinker with, but it will be hard to beat the 77gr for accuracy and open area SD.

[ubet]

I'm using a Mk262 Mod 1 clone round (77gr) in my 10.5" 1/7 pistol build that's styled after a Mk18 Mod 0. The SmallArmsSolutions ammo test has some terminal ballistic comparisons of this round from barrel lengths of 10.5"" through 20" and performance is impressive across the board. I load mine with 77gr SMKs or Noslers, over 23.8 or 24.0gr of 8208 XBR, LC brass and Rem 7-1/2 primers. MV averages around 2,780fps at 23.8gr with SDs around 10 and 3/4-MOA groups from my Mk12 Mod 1 (18" barrel). Accuracy is a little better at 24.0gr, but it's hot! I haven't checked velocity through the 10.5" pistol, but it should equal or exceed the Black Hills round - YMMV.

I'm also considering solids for better penetration, primarily the 62gr Barnes TSX, but can't find any in stock. I have some 70gr GMX solids to tinker with, but it will be hard to beat the 77gr for accuracy and open area SD.

I think I am going to force it to like 77gr nosler. I can run them in my 16” good and it likes them. Not as much as the smk, but I can keep 1000 of them in stock for when the need arises. I have 1500 62hpbt from hornady and 1000 75gr hpbt from everglades to use up. The 16” hates the 62s but seems to be decenttly happy with the 75gr. I hate having various rounds laying around for one gun. And I am not sure how I ended up with all of this.

For sd ammo though I do like the 62tsx, but as you say cant find them, and they’re ungodly expensive to have more than 2-300 rounds of them laying around.

I honestly hate load workup, I dont ming reloading so much now that I have a dillon 650. But load workup drives me nuts and I get to ocd about accuracy.


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