CROWN POI CHANGE

[dirtbikerick]

So I have had my crown I week now, I only have about I tin through it, today after work I raced home trying to beat the light to get some shots in. I set two targets out at 100 yards, with barrel extended, 33.95's and bag rested I put 16 shots on 1 target, the other 16 with barrel fully collapsed, I was very surprised on the difference in grouping, other than 1 flyer on the left target on shot 16, left target was barrel collapsed. 

 

[SocalTrail]

"dirtbikerick"So I have had my crown I week now, I only have about I tin through it, today after work I raced home trying to beat the light to get some shots in. I set two targets out at 100 yards, with barrel extended, 33.95's and bag rested I put 16 shots on 1 target, the other 16 with barrel fully collapsed, I was very surprised on the difference in grouping, other than 1 flyer on the left target on shot 16, left target was barrel collapsed.

Do you have a pic?

 

[dirtbikerick]

Here's the pic

 

[dirtbikerick]

Bad pic, sorry, you get the idea though.

 

[agnthooziast]

Have you tried it with "25.39" JSB's when there's little to no air movement? They are effected by wind though.

 

[2D1C]

Pretty interesting yes???

 

[dirtbikerick]

Better pics, top pic is collapsed 

 

[Glem.Chally]

That top group is phenomenal for a full mag at 100 yards.

 

[2D1C]

WOW Really nice!

 

[AirSupply]

That’s a ridiculous group. I do wonder if because the smooth x is so good shooters stop searching for more accuracy at what seems to be good/normal accuracy. 
The group with the shroud extended at 100y would make a lot of people happy and think all is well. 
The group with the shroud in is exceptional. I would say beyond most people’s expectations. I suppose also few shooters can shoot at 100y often . At 50y the difference may not have been so noticeable. 
The guy holding the gun is obviously no slouch!!
Very interesting comparison. 
Thanks for sharing 

 

[SocalTrail]

That is excellent shooting! Pretty awesome illustration of how moving the shroud in and out changes the harmonics of the barrel and effects the grouping. That would lead me to believe you could “tune” the gun to shoot the small groups with the shroud extended as well. Very, very interesting. This mirrors what I saw in my .22 Crown as well, except I had a pretty significant POI change also. Did you make any adjustments to the scope between the groups?

 

[2D1C]

Whats really interesting is these liners are "supposed" to be optimized for the 25.4's. I just started shooting the MKII's two weekends ago. They are more accurate even at 50 yards.
The group DBR shot was lights out! My gun hadn't even settled in after a tin!
Very well done!

 

[AirSupply]

"2D1C"Whats really interesting is these liners are "supposed" to be optimized for the 25.4's. I just started shooting the MKII's two weekends ago. They are more accurate even at 50 yards.
The group DBR shot was lights out! My gun hadn't even settled in after a tin!
Very well done!

That’s what I thought too. Was there a change in twist rate. 1:28 originally to 1:30? Could that make a difference. 

 

[2D1C]

Ive shot some nice groups? But that was nuckin futs!

 

[Widget23]

"AirSupply"

"2D1C"Whats really interesting is these liners are "supposed" to be optimized for the 25.4's. I just started shooting the MKII's two weekends ago. They are more accurate even at 50 yards.
The group DBR shot was lights out! My gun hadn't even settled in after a tin!
Very well done!

That’s what I thought too. Was there a change in twist rate. 1:28 originally to 1:30? Could that make a difference.

When did the change in twist rate occur in the .25?

 

[nomojo65]

Ya,that 100yd group is very nice! Ive shot numerous 50yd groups around 1 MOA , slightly less on average, 2 @ 65yds that were well under MOA! (All w/shroud retracted) I haven’t even played with Reg. Psi. It really seems to like the AA 18gr. Pellets the best? I haven’t got serious yet! Just getting familiar with it.

 

[2D1C]

@ Widget. Never did that I know of. I have never had my liner out. May do that because I read there is a tape on it the alludes to the twist rate.
If you think tuning these are a trick? wait till you play with the trigger! It's friggin awesome to set up.
Knowing what I do now, all I have learned here and else where? I am going to go back to the factory settings of 120 bar, hammer pre-load,
ect, ect ,ect ,and re-tune the gun.
Just because I CAN! LOL

 

[AirSupply]

"Widget23"

"AirSupply"

"2D1C"Whats really interesting is these liners are "supposed" to be optimized for the 25.4's. I just started shooting the MKII's two weekends ago. They are more accurate even at 50 yards.
The group DBR shot was lights out! My gun hadn't even settled in after a tin!
Very well done!

That’s what I thought too. Was there a change in twist rate. 1:28 originally to 1:30? Could that make a difference.

When did the change in twist rate occur in the .25?

This is a pic of Michael’s Crown. One of the very first. You can see the tag on the liner 1:28. 
Now I think there all 1:30 now. I haven’t taken mine out far enough to see what it is. I indexed it without needing too. 
Twist rates are black magic. I would have thought the King Heavies would need a quicker TR not slower. 

 

[AirSupply]

If you do want to look at your twist rate remember mark the liner before you move it. Just put a texter mark at 12 o’clock. Put it back the same way. 
Dont want anyone to find they have to re zero there scope. 

 

[dirtbikerick]

Thanks guys, that’s my best 100 yd work yet, you know that feeling you get when you shoot a good group that just makes you smile, I sure like how quiet it is with the shroud out but I might get the crown adapter and pull my sumo off the wildcat and give that a whirl. I have not played with power settings yet, the 25.39’s might need to be slowed down a tad but I’m just guessing because I have not got the chrony out yet.