FX Crown Mark 2 Barrel Swap – Tuning Info:
Today I removed 380mm barrel and installed 500mm.
How to do: Loosen 4 retaining screws, pull out barrel, install new barrel, tighten 4 screws – takes 2 minutes. No need to remove rifle from shooting bench.
Regulator Pressure = 140 bar.
380mm Barrel:
15.89g @ 885fps
18.13g @ 838fps
500mm Barrel:
18.13g @ 885-890fps
So, simply by swapping 380mm to 500mm – NO other adjustments, the velocity of the 380mm with 15.89s = the velocity of the 500mm with 18.13s. Isn’t that super convenient !? Use the 380mm to shoot 15.89s and the 500mm to shoot 18.13s.
See the paper plate for 40 Yard 5-shot groups. These 5-shot groups are the blue ½” circles. Note that both barrels can shoot ½” 40-yard groups (in breezy conditions!)
Note that the 500mm barrel shifted PoI 2.48 inches to the left from the 380mm barrel – but immediately shot a tiny sub-1/2’ group at 40 yards.
I did the barrel swap because I had the afternoon off and it seemed too breezy to target shoot.
Once I saw the groups, I shot two 40-Masters Cards (and one more late in the day):
Card #1: 186 5X (very breezy)
Card #2: 191 11X (less breezy – holy smokes, 11X – it felt like 30 yards I was hitting so many bulls)
Card #3: 187 7X (very breezy – shot late in the day in fading light)
This 500mm / 18.13g combination holds promise. The 191 11X card felt awesome as I was shooting it.
I believe the 18.13g are going to be better than the 15.89 at 40 yards with any wind. I did shoot 3 straight 190+ 40 Cards with the Crown and 15.89s in still conditions the other day – but any wind the the 15.89s move around more than the 18.13s do.
I hope this info is helpful to folks thinking about adding a barrel to their FX Crown. The 380mm with 15.89 and the 500mm with 18.13g seem an excellent setup. I’ll eventually do some testing with the 700mm barrel and 21g & 25g.
-Ed
Today I removed 380mm barrel and installed 500mm.
How to do: Loosen 4 retaining screws, pull out barrel, install new barrel, tighten 4 screws – takes 2 minutes. No need to remove rifle from shooting bench.
Regulator Pressure = 140 bar.
380mm Barrel:
15.89g @ 885fps
18.13g @ 838fps
500mm Barrel:
18.13g @ 885-890fps
So, simply by swapping 380mm to 500mm – NO other adjustments, the velocity of the 380mm with 15.89s = the velocity of the 500mm with 18.13s. Isn’t that super convenient !? Use the 380mm to shoot 15.89s and the 500mm to shoot 18.13s.
See the paper plate for 40 Yard 5-shot groups. These 5-shot groups are the blue ½” circles. Note that both barrels can shoot ½” 40-yard groups (in breezy conditions!)
Note that the 500mm barrel shifted PoI 2.48 inches to the left from the 380mm barrel – but immediately shot a tiny sub-1/2’ group at 40 yards.
I did the barrel swap because I had the afternoon off and it seemed too breezy to target shoot.
Once I saw the groups, I shot two 40-Masters Cards (and one more late in the day):
Card #1: 186 5X (very breezy)
Card #2: 191 11X (less breezy – holy smokes, 11X – it felt like 30 yards I was hitting so many bulls)
Card #3: 187 7X (very breezy – shot late in the day in fading light)
This 500mm / 18.13g combination holds promise. The 191 11X card felt awesome as I was shooting it.
I believe the 18.13g are going to be better than the 15.89 at 40 yards with any wind. I did shoot 3 straight 190+ 40 Cards with the Crown and 15.89s in still conditions the other day – but any wind the the 15.89s move around more than the 18.13s do.
I hope this info is helpful to folks thinking about adding a barrel to their FX Crown. The 380mm with 15.89 and the 500mm with 18.13g seem an excellent setup. I’ll eventually do some testing with the 700mm barrel and 21g & 25g.
-Ed
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