Texan .257 – almost ready

Latest project – Texan .257 is almost ready. Not so much to share yet, but a lot of pictures!

 

Some initial testing at the range..

Texan .257 bone stock with Harris bipod.
Some initial groups during a windy day. Not that bad. 6 shots, 100 meters.
5-shots, 100 meters, not so windy anymore.
41gr .22lr bullet (left) compared to 65, 75 and 85gr NSA .257 HP-BT bullets

 

Time to upgrade..

Cheap chinese scope mounts needs to go. American Defense RECON-SL 20MOA QD Mount
Pinkney Engineering muzzle brake from UK to tame to muzzle jump.
Maddog RJ-9A stock. Seems very sturdy and the quality is flawless.
Airforce Texan .257 with Maddog RJ-9A stock

 

More to come, stay tuned!

Kalibrgun Cricket .25

Conditions: +5°C, 12-15m/s wind, 14-18m/s gusts
Gear: Kalibrgun Cricket .25 + H&N Grizzly 31gr

This is the gun I’ve wanted to own so long – and finally got one!

..and the best part is, that it’s with the older WST stock. What a beauty!

First range day behind (in extreme wind conditions) and nearby weather station recorded insane numbers: wind speed 12-15m/s, gusts 14-18m/s. Not the best day to shoot for sure.

I tried few regular pellets including 34gr JSB King Heavys, but not every shot was even on paper because of the wind, so I shot only 31gr H&N Grizzlys which I run through sizer (.250)”. I read lot of people complaining about accuracy with these bullets and the main reason probably is the fact, that they’re very inconsistent out-of-the-box (.002″ variation in diameter at worst).

After some tuning with HST screw and regulator pressure, 31gr H&N Grizzly bullet leaves the barrel with velocity of 275m/s (902fps) while generating 75 Joules (55ft-lb) of kinetic energy.

Best group I got with JSB 34grain heavys. 5-shots 99mm. Distance 100 meters.

 

H&N Grizzly 31grainers performed noticeably better..

First 4 shots 29mm, 5-shot group 63mm. Distance 100 meters.
5-shot group 98mm. Lots of gusting wind. Distance 100 meters.
5-shot group 38mm. Wind direction and speed seemed to stay consistent at least for a while, so I put 5 shots as fast as I could. Distance 100 meters.

I think this gun is easily 1MOA capable at 100 meters during a calm day. Lot’s of bullet testing ahead!

Did a lot of different kind of a shooting also – namely cinematography.

Sneak peek to coming film about the gun.

Back to business

Conditions: +16°C, 2-5m/s wind, fog
Gear: AF .223 + TT-OPTH, NOE SP-GC 51gr .223″

Finally got my new valve stem/onepiece tophat from TalonTunes to replace the broken stock one. Regardless from the pressure and/or HST, without any restrictor insert, the infamous valve dump occurred. TT tophat seems to have more gap between the tophat and valve housing compared to my setting with the stock stem, so I’ll propably try to put o-ring between tophat and housing to decrease stem travel and therefore avoid valve dumps.

After inserting the largest restrictor the gun worked fine, but velocity was rather low (I think it was sub 250m/s, didn’t chrony). Few 10-shot groups with this setup:

10-shots, 49mm, 100 meters (109yds)
10-shots, 64mm, 100 meters (109yds)
10-shots, 58,5mm, 100 meters (109yds)

Groups averaged 1.96MOA.

Gear update: Wiebad rearbags

Was looking a long time for good high quality bags, that I could use at both range and field. Criteria was adaptability, durability, weight (for field use) and ruggedness for benchrest shooting. I think Wiebad bags are best of both worlds, very happy with them.

New barrel

After five weeks of waiting (which is relatively short time, compared to firearms), I finally received a new barrel for my AF Escape. Barrel is .223Rem with 1-in-12″ twist rate and has length of 610mm (24″). Made by LW.

Based on my calculations, 12″ twist should be enough to stabilize 50gr bullet even at lower velocities (sub 280m/s / 900fps), so the “chamber” was reamed to accept 15mm long bullets, where most of the 40-50gr bullets land.

Gear update: Laser rangefinder

When shooting at lower velocities below Mach 1, trajectory is more like an arch of a mortar projectile, than a flat straight line. Therefore, especially at longer distances even being off by few meters in calculations can throw you off by several centimeters.

Vortex Ranger 1300 has theoretical maximum of 1300 yards (1188 meters) to reflective target. I’ve successfully measured distances up to 468 meters on a clear day, so performance is more than enough for me.

Vortex Ranger 1300