Gunsite XLR class

CoryT

Gunny Sergeant
Mar 5, 2004
1,175
26
48
61
Paulden, AZ
www.gunsite.com
#1
The latest class is in the books. Only three clients, some last minute cancellations due to the Florence debacle on the coast. This was the first class to use the new Shotmarker target system, which is going to be a great help during these classes. We get not only the shot location but the velocity at the target displayed on a laptop. With the target at 1000 yards and the Labradar setup at the shooter, we can calculate very precise BC's with just a couple of groups. With this class, we were able to illustrate a variance in BC due to barrel/muzzle brake/suppressor. Two shooter using the same lot of Hornady 285 ELD's had two different BC's, as the velocity decay difference showed. For example, one shooter starts the bullet at 2896 and it arrives at the target at 1921, the other shooter initial velocity is 2827 and the target velocity it 1919. This trend continued so that one ended up with a BC of .78 and the other with .83, both BC's provided correct trajectories the next day from 600 to 2000 meters. Changes in the departure angle of the projectile due to the muzzle brake and suppressor affect BC.

The next class will be using the target at 500, 1000 and possibly 1250 for multiple downrange velocities. This is a great system and a big time saver as well, since we won't have to go back and forth downrange to collect paper targets. If you have not seen it yet, go to Shotmarker and take a look, well worth the investment.

Scope calibration revealed a cant problem, even in a Spuhr mount. The scope was actually fine, but the level attached to the scope tube (the mount level is almost invisible on this setup) was off WHEN VIEWED FROM THE SHOOTERS POSITION. It was placed from behind the butt, and the parallax from viewing by the left eye caused a shift of about .6 mil at 1450 yards, not good. Once corrected for viewing angle, there were no further difficulties.

The Magnetospeed target flashers work great, we'll add more of those as well.

The 'UKD' targets provided some challenges. Using a LRF at these ranges requires some practice and knowledge of the actual beam size and location versus the aiming point. Some ranges were off by 10-14 yards, and at 1600 that results in shots going high/low rather that getting the hit, then people start to question the software solution. Once we illustrated the problem and corrected the range, it was clear that just having a great LRF like a PLRF 15 is not the entire solution to the rangefinding problem.

A great time was had by all, and I look forward to the next one in the Spring!
 

Unknown

Gunny Sergeant
Sep 17, 2009
3,198
292
83
Pacific Northwest,USA
#2
Shotmarker looks like a really cool system, even if other toys are higher on my priority list at this time. It sure would make running a match easy though.
Murphy's law says that just like people shooting their old style chronographs, someone is eventually going to shoot one of the sensor units.

The advance of technology this system uses is really neat, and I would love the chance to try one out, or even see one working at one of the local Precision rifle series matches, or practical rifle matches.
 

CoryT

Gunny Sergeant
Mar 5, 2004
1,175
26
48
61
Paulden, AZ
www.gunsite.com
#3
The good news is a replacement sensor is pretty cheap and can be kept on hand ($40). the cables are simple 3.5mm audio. The expensive part is the sensor hub, but it's small enough to be easily protected, I've got an AR500 plate bolted in front.