Those pesky .30 cal Impact X barrel liner O-rings...now fantastic groups.

[far_shot]

Esting Rowe did a video where he made delrin spacers to keep the liner O-rings in their proper spacing. I placed one O-ring dead center on the barrel and one seven inches from each side of the center one. The fourth O-ring is 3" from the breach. I wrapped several layers of masking tape on each side of the O-ring to keep them from rolling up the barrel as it was slid into place.....but not enuf layers of tape to be greater than the OD of the O-ring. Just a light snug on the muzzle nut. Running about 820 fps. Now I'm scared to touch or change anything.

No wind,80 yards,5 shots

Next day, a steady breeze blew off aiming dot 2&3/4 inches to the right. 5 shots.

I'd like to get it up to 860 fps to lessen the wind drift....but scared to mess with it now

 

[Bob_O]

Holy moly!!! 



At least give it a try.....if it doesn't work it should be easy enough to go back to the setting you have.

 

[Gunny994]

Wow that’s impressive, nice work.

great idea with the masking tape, I haven’t put the x liner in my wildcat yet, I was wondering how I was going to keep the o rings in place.

 

[Bob_O]

I used a few wraps of duct tape torn into 1/2" strips. My initial accuracy testing was not good, so I took the O-rings off. My second round of accuracy testing was good, but I think that was due to a different tune and not to the absence of O-rings.

Chances are I'll put them back on and do the accuracy testing again.

 

[tor47]

I can see the theory of using tape, to keep them from moving. If they change position every time the liner is taken out for cleaning, they might change the harmonic behavior of the barrel. Leaving them out, may be better than having them in shifting position. But in long barrel, having them locked in a fixed position with tape, might be better?

 

[Bob_O]

I have to agreee with you tor....makes sense to me.

 

[Ziabeam]

This review pushed me over the edge...

Just ordered the 700mm .30 cal "X' barrel, two high cap mags, and side shot camera mount with 30mm and 1" adapters.

If you never hear from me again.... my wife saw the massive bank account balance decrease

 

[Bob_O]

 

[Spray1Mark]

A vid the other day say the O rings are for harmonics not accuraccy, they could be removed without issue.

On a side note to Zia I did think about the 700mm STX but there is no 700mm shroud for the Crown so you can't interchange, hence I went for the 600mm version.

 

[Bob_O]

Steve from AEAC said they are there to improve the soundput of the rifle, I think that's what he said. 

Harmonics, yes, which could translate into accuracy. I will do a back-to-back test on the bench to see if there's a difference.

I don't know if the breech end of the Impact barrel is the same as the Crown. If it is, you could put a 700mm (full barrel) on the Crown.....you would just have to use the 600mm shroud.

Those are my thoughts anyway.

 

[far_shot]

To get those groups, I used a very solid shooting platform of a 5 gallon barrel full of dirt, Ransom front rest and home made rear rest. Bags filled with very heavy Zircon sand, fully adjustable for elevation and windage. Add many decades of competition shooting in nearly all rifle and pistol avenues as well as many friends I have gained and sharing their tips When you can see your heart beat move the cross hairs,you are not locked in solid enuf.
Black powder rifle & Pistol competition
1/4 scale (1&5/8ths bore) cannon competition
Indoor rifle & pistol league
IHMSA long range pistol competition
Postal matches
Combat pistol matches
Bowling pin shoots
Clay birds
Big bore bench rest competition
NRA 22 rifle silhouettes competition
DCM hi power matches

 

[spud]

Hey Far Shot

I see you are using the edgun manometer with the sideshot magazine. Did you have any issues? I'm unable to get a good seal on the manometer without using what seems like undue force.

 

[far_shot]

Spud, just now saw your question. The gauge seal with a very light snug on the wrench...that is a surprise with the pressure it is dealing with. It is very hard to turn on the gauge reading when it is cold...wish there was a more flexible readout cover for it.

 

[Jlacouturec]

it must be very easy for the 700mm barrel to reach 870-880fps!!!

 

[far_shot]

The Edgun gauge is saying 139 to 141 BAR average between shots. 894 was the highest I saw on the Labradar. The first shot was low, not sure why as the BAR at that shot was 148. Thinking the hammer strike can not totally release the higher BAR. The regulator creeps up several BARs after a few hours of sitting, almost always. That first shot is always a couple inches low at 123 yards.....time for a Huma regulator? Impact .30 regulator is stock and serial # 184039.

 

[Bob_O]

The last two times I shot sub-1" groups at 100yds with my Crown 22, I had the liner O-rings in place.

 

[mtnGhost]

Dumb question (I'll do diligent research soon) - does this Deleon spacer mod also benefit the Impact X or just other FX models using this barrel?