Ammo Options for the Sig P320 XTEN 10mm Pistol

The first question that most people ask when receiving any gun is, what is the best ammo to use with it?

This depends on many factors, including what the shooter is actually using the gun for, however one of the largest factors that makes a certain ammo type the best is the actual gun. Not every gun is alike and even with a pistol that was made on the same manufacturing line back to back, it may still shoot better with one type of ammo vs the other. With that though, there is merit to see how ammo performs to get an idea of where to start.

10mm is quickly becoming a favorite in many households. On a day of putting a new Sig XTEN through its paces, we were able to shoot six different kinds of ammo and see how they grouped and how the recoil felt. Ammo choices are not only based on the grouping size during testing but also on how well you as the shooter can shoot the gun. One type of ammo can show a great group but another close 2nd could be a lot easier to shoot. And let’s face it, this is 10mm, and it is not the easiest of shooting, to begin with.

Below are the results.

The Gun

We have a brand new Sig P320 XTEN. This is a full-sized, striker-fired, polymer-framed, 10mm Auto pistol with a 5″ barrel and day/night sights.

Honestly, the Sig P320 XTEN is a P320 but in a larger frame and different caliber. The recoil acceptance for the power of the 10mm is on point and the firearm is still practical. It has day/night sights, is optic-ready, and can be seated into holsters that many already own.

showing the p320 xten in a smaller female hands. Comes with night sights and optic ready.
As shown in my hands during a couple of drills, the XTEN controls are friendly to any sized hand. It accepts the recoil of the 10mm even while having a polymer frame.

Sig P320 XTEN Features

  • Caliber: 10mm Auto
  • Sights: X-RAY3 Day/Night Sights
  • Barrel Length: 5 in.
  • Weight: 33 Oz.
  • Accessory Rail: Yes
  • Trigger Action: Striker
  • Trigger Type: XSeries Straight
  • Grip Module: Full-Size Polymer XSeries
  • Barrel Material: Carbon Steel
  • Slide Material/Finish: Stainless Steel w/ Nitron Finish
  • Optic Ready?: Yes

The Exercise

For this exercise, a five-round group is shot at 25 yds at a B-8, not under time, for each type of ammo. To have consistent shooting I called on Joshua Shaw, A GrandMaster in USPSA to shoot the groups.

Ensure that you are shooting at a distance far enough away to show the spreads in ammo. Josh stated that 10 yds won’t really show the difference in ammo, you have to push out. So get to a distance where you can still capably shoot but far enough to show the different capabilities in ammo.

USPSA GM shooting the 10mm P320 XTEN
Shooting a B8 at 25 yds is no easy feat. Now shoot it six times back to back with 10mm. Due to how tough that is, I asked GM Josh Shaw to ensure that this testing is legit.

This type of drill is good for anyone that just received a brand-new firearm or barrel. Here’s a tip: don’t go to the store and pick up a ton of ammo. You might end up with ammo that shoots like crap in your gun, or you might miss out on a more capable gun/ammo pairing. Instead, shoot this drill with five different types of ammo first.

Doing this means that you only have to buy one box per ammo type and use a couple of targets to really hone in on what type of ammo works best in your firearm. It also takes less than an hour at the range.

A little-known fact: we often do this drill and testing during reloading in the precision rifle world. When we get a new barrel we will use the last load as a baseline to start our grouping and velocity tests, but we will load a couple more rounds with different powder loads and seating depths. This is the same thing that we are doing today with a pistol. Barrels like different things, as do pistols, don’t allow yourself a less capable firearm because you didn’t take the time to find the best ammo for it.

The Ammo

Jacketed Hollow Point ammo was chosen for this grouping test. This type of ammo is great for defensive situations or hunting. 10mm is a very niche caliber. Below are the ammo types for each group.

  • PMC Bronze:10mm Auto, JHP, 170gr.
  • Nosler: 10mm Auto: JHP, 180 gr.
  • HSM: 10mm Auto: JHP, 180 gr.
  • Federal HST: 10mm Auto, HST JHP, 200gr.
  • Federal PUNCH: 10mm Auto, JHP, 200 gr.
  • Sig V-Crown: 10mm Auto, JHP, 180 gr.
Boxes of 10mm ammo to test with the Sig 320 XTEN
These are the five types of ammunition that were used during the grouping exercise. We decided to do this exercise with all JHP due to it being a defensive round and not just a plinking round. (The CCI Blazer target/plinking ammo was left for shooting quick drills and testing how the XTEN handles recoil overall.)

The Groups

Don’t worry about what side of the paper that the rounds are impacting, just focus on group size. The iron sights weren’t adjusted before shooting and different ammunition will always need a different zero.

10mm shot groups with PMC, Nosler, and HSM ammo
Left: The PMC ammo shot a great five-round group at 25 yds with three rounds touching. Center: The Nosler group at 25yds. Don’t worry about where it impacted the paper, just look at the group size. The iron sights were not adjusted. Right: HSM at 25yds. Definitely larger but still great with 10mm.
10mm shot groups at 25 yards with Federal HST, Federal Punch, and Sig V Crown ammo
Left: The Federal HST shot a very tight five-round group at 25 yds. Center: Federal Punch at 25 yds. While Federal Punch has a lot of the same specs as Federal HST, it does expand differently during penetration. Right: A 5five-round group with the Sig V Crown Ammunition. The fact that a group like this can be shot with 10mm is pretty wild.

The Results

Based on the target alone, the best group that day was the SIG V-Crown 180 gr JHP,and worst was the Federal Punch 200gr. Feedback from Josh was that the softest shooting was the PMC ammunition, which also proved to have a great group.

Group sizes in order, beginning with the tightest group”

  1. Sig V-Crown 180gr JHP
  2. PMC 170gr JHP
  3. Federal HST 200gr
  4. HSM 180gr
  5. Nosler 180gr
  6. Federal Punch 200gr

When choosing your desired ammo type you want to know the group sizing as well as how you can manage the recoil. Josh stated that the softest shooting was the PMC. Even if that didn’t have the tightest group, it had a great group and Josh could handle it better than other ammo types. To have a capable gun, the shooter needs to be capable too, and a softer shooting ammo type could allow for better shooting, no matter what the group testing showed.

Personally, for this specific gun, I would first look at how the ammunition expands between the two best ammo types on the list, Sig V-Crown and PMC. After that research, I would then go forward with my decision on what to carry in that gun. Without the expansion research, I would choose the PMC as my ammo type due to softer shooting and a great group. 

Remember, these groups are for this particular Sig P320 XTEN. Yours may like different ammo.

Happy shooting!

Anne Smith is a Veteran of the full time MNARNG force as a Small Arms Repairer and worked to bolster their marksmanship team. Mainly a technical writer and gunsmith within the Federal world she comes with many armorer classes under her belt such as KAC, Glock, every FN weapon in the book, and Small Arms Weapons Expert (SAWE). So, sorry to bore you with the knowledge that actually make firearms shoot. Currently heavily into the long range world she competes in National Rifle League Hunter and various Gas Gun Precision Series.

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