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Page AR-15 » Ammunition
AR Sponsor: bravocompany
Posted: 8/12/2023 10:37:35 AM EST
Is there any significant difference between PMC's "Bronze" and "X-TAC" iterations?
Link Posted: 8/12/2023 10:45:23 AM EST
Assuming you mean both their 55gr loadings, and based on their descriptions, the X-Tac has a higher MV (3200 vs. 3270), and it would imply that the X-Tac is "duty" grade and has tighter quality control standards over the Bronze, which is their range/plinking line.

The bullets themselves have the same stated dimensions and ballistic coefficient, so they're probably the same.
Link Posted: 8/12/2023 10:52:24 AM EST
Sounds good. Thanks for the clarification.
Link Posted: 8/12/2023 11:07:03 AM EST
No, they are not the same and they both fail to meet the US mil-spec for M193.

Link Posted: 8/12/2023 11:24:36 AM EST
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No, they are not the same and they both fail to meet the US mil-spec for M193.

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Muzzle velocity? Dimensional tolerances? Something else?
Link Posted: 8/12/2023 12:28:24 PM EST
Bronze seemes to be more gassy shooting suppressed (at least IME). Not blast you in the face gas, but that shit that drifts up in between strings of fire. Not a big fan of it with the can. I dont notice that with X-tac. Haven't had any failures with either.
Link Posted: 8/12/2023 7:23:24 PM EST
Bronze is .223 and X-Tac is 5.56
Link Posted: 8/12/2023 9:40:05 PM EST
Link Posted: 8/13/2023 12:09:24 AM EST
i chrono’d several variants of 5.56 a couple weeks back. x-tac was hands down one of the worst performers. to me it’s really nothing more than a plinking ammo. just to give you some info..

this is out of a 14.7” AR with a yhm t2 suppressor.

x-tac 55gr - 2875
igman 55gr 223 - 2890
imi 55gr - 2926
winchester white box 223 - 2992
ppu 55gr - 3035

imi 855 62gr - 2857

hornady frontier 75g - 2652
aac 75gr bthp - 2662

aac 77gr bthp - 2539
aac 77gr tmk - 2611

speed isn’t everything, but my groups opened way up with x-tac too. i’m not the best shooter, but it was quite noticeable of a difference.

you may see different results in your gun, but i haven’t heard great things from others regarding x-tac either.
Link Posted: 8/13/2023 1:23:02 AM EST
IIRC X-tac is crimped/sealed primer and just annealed instead of polished.  In my guns X-Tac is hotter, but less consistently so.  Bronze has marginally more consistent (but lower) velocity, and slightly more accurate.
Link Posted: 8/13/2023 12:23:24 PM EST
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Bronze is .223 and X-Tac is 5.56
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X-TAC is not a 5.56 load.  Look at the data that bfoosh06 posted.

PMC Bronze 55 Grain FMJ

I evaluated the accuracy (technically, the precision) of the PMC Bronze 55 grain FMJ ammunition using my 20” stainless-steel Lothar-Walther barreled AR-15.  This barrel has a 223 Wylde chamber with a 1:8” twist.

Three 10-shot groups fired in a row from the bench at a distance of 100 yards had the following extreme spreads:


for a 10-shot average extreme spread of 2.06”.  The 30-shot composite group had a mean radius of 0.72”.

Unfortunately, my cocker spaniel chewed-up my chronograph data for this load.

The smallest 10-shot group . . .

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