04-23-2019, 09:49 AM
Update.
So, have a update due to some changes on the rifle.
Was going to test some new powder with a 140gr ELD-M bullet.
Mounted my Magnetospeed Sporter on the barrel and used a plastic rod that I´ve put in the muzzle to line up the chrono.
Forgot to remove the plastic rod and fired one shot. The rod was totally destroyed. Didn´t find any more problems so I continued to shoot and gather speeds and info.
A few weeks later on a local match I found out that something had happened. Got huge spred on 100meters on the first target. Att 300meters the spread was about 15"...
Did some test at 100meters.
Here is 5 shots.
[ATTACH=CONFIG]14142[/ATTACH]
The gunsmith found a cavity about 1-1½" from the muzzle. And the barrel needed to be cut down.
This ended up in a 18" barrel on my Grendel.
And here two groups with 5 shots.
The lower group was for sight in, and the top after adjustment. And at 100 meters, prone.
[ATTACH=CONFIG]14143[/ATTACH]
So it looks as it still preforms, but with shorter barrel.
The speed is however a bit lower due to the shorter barrel.
Previous with 20" barrel the speed for a 108gr Scenar was: 794 m/s (2605 fps)
With the 18" barrel the speed for the same bullet is: 784 m/s (2572 fps)
So total loss is about 10m/s (33 fps) with this bullet.
Did also som tests with this bullet and new barrel length at 600m (656 yrd).
Here is 10 shots at this distance. The two lowest one to the right was my fault, too trigger happy..... But 8 shots under 4" is OK for me.
[ATTACH=CONFIG]14144[/ATTACH]
So, have a update due to some changes on the rifle.
Was going to test some new powder with a 140gr ELD-M bullet.
Mounted my Magnetospeed Sporter on the barrel and used a plastic rod that I´ve put in the muzzle to line up the chrono.
Forgot to remove the plastic rod and fired one shot. The rod was totally destroyed. Didn´t find any more problems so I continued to shoot and gather speeds and info.
A few weeks later on a local match I found out that something had happened. Got huge spred on 100meters on the first target. Att 300meters the spread was about 15"...
Did some test at 100meters.
Here is 5 shots.
[ATTACH=CONFIG]14142[/ATTACH]
The gunsmith found a cavity about 1-1½" from the muzzle. And the barrel needed to be cut down.
This ended up in a 18" barrel on my Grendel.
And here two groups with 5 shots.
The lower group was for sight in, and the top after adjustment. And at 100 meters, prone.
[ATTACH=CONFIG]14143[/ATTACH]
So it looks as it still preforms, but with shorter barrel.
The speed is however a bit lower due to the shorter barrel.
Previous with 20" barrel the speed for a 108gr Scenar was: 794 m/s (2605 fps)
With the 18" barrel the speed for the same bullet is: 784 m/s (2572 fps)
So total loss is about 10m/s (33 fps) with this bullet.
Did also som tests with this bullet and new barrel length at 600m (656 yrd).
Here is 10 shots at this distance. The two lowest one to the right was my fault, too trigger happy..... But 8 shots under 4" is OK for me.
[ATTACH=CONFIG]14144[/ATTACH]