223 85.5 Berger hybrids inconsistent

[ranger3]

I recently rebarrelled my Tikka 223 to a seven twist barrel. I have very few rounds on it at this point. I’m trying to shoot the 85.5 grain Bergers and I have attached a picture of the groups that I have shot with this bullet.
First of all the group with the larger center hole was shot in two sessions of five shots each. Both groups were shot at 100 yds with a cool barrel but at different times. I’m baffled as to why I’m getting a right flyer on my first shot and sometimes on my last shot. I’m also getting a left flyer on my last shot . The second Target is the very first group that I shot with this bullet. All of these had 205M primers, 24.0 grains of Varget and a seating depth of 1.785. It seems to want to shoot well, but I’m not sure why I’m getting these flyers. I weigh all loads Twice, once with a Creedmoor electronic scale and then an old Ohaus 1010 scale that has been consistent for me . If anyone has any idea as to what I should do to fix this, feel free to share it with me . I had hoped to use this rig for longer ranges like 600 and maybe 1000 yds. I’m also trying 80 SMK bullets but haven’t finished. My seating depth is not perfect each time. I’m happy with the velocity.

 

[Gabe22BR]

Where barrel come from ??

 

[Jeff Porter]

What is the chamber? Those need more freebore than standard 223 or even a Wylde to work best.

 

[Jeff Porter]

Edit to add. Looking at your base ogive number you have a lot of the shank in the neck of the case.

 

[JAlfred]

How many rounds down the barrel?

 

[ranger3]

Criterion match. About 100 rounds

 

[Dolomite]

This might interest you..

223 and Berger 85.5g LR Hybrid?

Anyone shoot the Berger 85.5s out of a bolt 223 Wylde? If so how's the accuracy and speed? I'm not sure these 75g ELDMs are going to be what Im looking for. They're just being inconsistent pieces of fuck really. They'll shoot good 1 day and so so the next. But, regardless I always have a little...

www.snipershide.com

 

[LVLAaron]

For what it's worth.. the 85.5 can be fickle. Some people have luck with it... some people absolutely hate it.

 

[dusterdave173]

I have an Urban 223 ISSF barrel that simply LOVES the 85.5

 

[boltfluter]

My Tikka.223 came alive with Varget when I switched to a Cci-450. A primer in these smaller cases can make huge difference in my experience. Good luck.
Paul

 

[Walt Krafft]

What size and shape were your groups before you rebarreled the rifle. Try N140 or Varget with the Berger 80.5. It is the easy button for accuracy and fine for 600 yards.

 

[ranger3]

What size and shape were your groups before you rebarreled the rifle. Try N140 or Varget with the Berger 80.5. It is the easy button for accuracy and fine for 600 yards.

Never tried it with the factory 8 twist bbl.

 

[Rocketvapor]

What kind of velocities are you getting.
S.D. and E.S.?

I'm shooting the 85.5's but in a 28" 7 twist 22 Nosler AR-15.
My groups open up if I go much over 3000fps.
This is a 3 relay 600yd F-Open match.

 

[Sumtoc]

I shoot mid range F-Class with these bullets. Last outing I shot a 200-17 at 600. But it is a Krieger barrel with the ISSF chamber. Not particularly fast, a bit over 2850 with N140 and CCI br primers. As has been mentioned many times low ES and SD numbers are very difficult to obtain in 223, but mine still shoots very well. That chamber spec is the key IMO.......

 

[ranger3]

What kind of velocities are you getting.
S.D. and E.S.?

I'm shooting the 85.5's but in a 28" 7 twist 22 Nosler AR-15.
My groups open up if I go much over 3000fps.
This is a 3 relay 600yd F-Open match.
View attachment 1582041

This can vary from 2716 to 2745 sd’s range from 8.2 to 10.7.

 

[Rocketvapor]

Four or 5 shots might not tell you much about S.D.
Your water line is better than your horizontal.
Horizontal @ 100 is probably not the barrel.

 

[ranger3]

Four or 5 shots might not tell you much about S.D.
Your water line is better than your horizontal.
Horizontal @ 100 is probably not the barrel.

Thanks

 

[Walt Krafft]

Never tried it with the factory 8 twist bbl.

The reason I asked, is there are a lot of things that cause bad groups. Some gun related, some ammo related, and some shooter related. If we knew it shot good before the barrel change it would tell us a lot. Try my known good load and see how it shoots. If it doesnt, ammo is not going to fix it.

 

[urbanrifleman]

I recently rebarrelled my Tikka 223 to a seven twist barrel. I have very few rounds on it at this point. I’m trying to shoot the 85.5 grain Bergers and I have attached a picture of the groups that I have shot with this bullet.
First of all the group with the larger center hole was shot in two sessions of five shots each. Both groups were shot at 100 yds with a cool barrel but at different times. I’m baffled as to why I’m getting a right flyer on my first shot and sometimes on my last shot. I’m also getting a left flyer on my last shot . The second Target is the very first group that I shot with this bullet. All of these had 205M primers, 24.0 grains of Varget and a seating depth of 1.785. It seems to want to shoot well, but I’m not sure why I’m getting these flyers. I weigh all loads Twice, once with a Creedmoor electronic scale and then an old Ohaus 1010 scale that has been consistent for me . If anyone has any idea as to what I should do to fix this, feel free to share it with me . I had hoped to use this rig for longer ranges like 600 and maybe 1000 yds. I’m also trying 80 SMK bullets but haven’t finished. My seating depth is not perfect each time. I’m happy with the velocity.

What freebore?

 

[CADDIE5]

My Barnard 223rem with issf reamer and Brux 30"7T bbl shoots 85.5hybrid @ 2800-2820fps muzzle which is a vg node for 600yd competition. 0.015" jump to lands. 2.0385" bto. Range elevation 600ft.