223 barrel length & speed

[fwafwow]

All of the below were shot today from my T3x cut to 16.5" with a TBAC Ultra 9 (Gen 1) suppressor at around 1100 feet and 35-40 degrees. 10 shots each. All speeds are averages.

1. ADI 223 69gr SMK - 2720.8; 28.9 SD
2. Winchester 5.56 62gr M855 - 3019.3; 14.9 SD
3. Hornady 223 55gr FMJ/BT - 2874.2; 39.6 SD
4. Hornady 223 73gr ELD-M - 2590.8; 12.3 SD
5. Stand 1 223 77gr TMK - 2830.6; 15.9 SD
6. Black Hills 5.56 77gr TMK - 2717.7; 24.2 SD

 

[Eleven]

Winchester 5.56 62gr M855 - 2019.3; 14.9 SD

is that real or a typo? I would expect it to be a bit higher. Thanks.

 

[fwafwow]

is that real or a typo? I would expect it to be a bit higher. Thanks.

Sorry typo - fixing now. I was only off by 1k

 

[Thegman]

All of the below were shot today from my T3x cut to 16.5" with a TBAC Ultra 9 (Gen 1) suppressor at around 1100 feet and 35-40 degrees. 10 shots each. All speeds are averages.

1. ADI 223 69gr SMK - 2720.8; 28.9 SD
2. Winchester 5.56 62gr M855 - 3019.3; 14.9 SD
3. Hornady 223 55gr FMJ/BT - 2874.2; 39.6 SD
4. Hornady 223 73gr ELD-M - 2590.8; 12.3 SD
5. Stand 1 223 77gr TMK - 2830.6; 15.9 SD
6. Black Hills 5.56 77gr TMK - 2717.7; 24.2 SD

If you reload, can you pull a bullet on one of those Stand 1s and get an idea of what powder they're using and amount? I'm curious about what they're using.

I know you can't know exactly what powder it is, but if you have a collection of the likely powders, you could do some comparing and maybe get an idea. 2,830 is obviously really fast out of a 16" barrel.

 

[fwafwow]

If you reload, can you pull a bullet on one of those Stand 1s and get an idea of what powder they're using and amount? I'm curious about what they're using.

I know you can't know exactly what powder it is, but if you have a collection of the likely powders, you could do some comparing and maybe get an idea. 2,830 is obviously really fast out of a 16" barrel.

I don’t reload. Sorry.

 

[Thegman]

I don’t reload. Sorry.

You need to work on that...

 

[Jay Ell Gee]

All of the below were shot today from my T3x cut to 16.5" with a TBAC Ultra 9 (Gen 1) suppressor at around 1100 feet and 35-40 degrees. 10 shots each. All speeds are averages.

1. ADI 223 69gr SMK - 2720.8; 28.9 SD
2. Winchester 5.56 62gr M855 - 3019.3; 14.9 SD
3. Hornady 223 55gr FMJ/BT - 2874.2; 39.6 SD
4. Hornady 223 73gr ELD-M - 2590.8; 12.3 SD
5. Stand 1 223 77gr TMK - 2830.6; 15.9 SD
6. Black Hills 5.56 77gr TMK - 2717.7; 24.2 SD

Thanks for this. That Stand 1 load seems screaming fast. I have plenty of BH for the moment, but I may have to consider trying them in the future.

 

[PBBananaHammock]

Anyone notice if the tikka factory barrels in 223 are naturally slow with factory ammo like some of their other chamberings? It seems common for their 6.5cm rifles to run 100fps or so slow.

I’m cutting a 223 down to 18 or 20, but wondering if I should account for that.

 

[fwafwow]

Anyone notice if the tikka factory barrels in 223 are naturally slow with factory ammo like some of their other chamberings? It seems common for their 6.5cm rifles to run 100fps or so slow.

I’m cutting a 223 down to 18 or 20, but wondering if I should account for that.

My post #61 is for a factory barrel cut to 16.5”

 

[IslandBoi]

I picked up the 20", but the twist is 1:12. I'll likely do a re barrel to 1:7 or 1:8. Pretty frustrating to have to pay that much for a Tikka 223 lefty. Worst part: I'm right handed but cross eye dominant. I've tried shooting right hand rifles, but the lefties are just more comfortable.

I'm the same but just forced myself to shoot right for a year once I got into shooting more often and now I feel just as comfortable shooting right handed

 

[mt terry d]

I've got a JK155 coming

Tikka T3X with the fluted bbl.

Need the threading done, wondering about length.

It appears lopping off a couple inches or so has little effect on MV.

What are the advantages of shortening the bbl other than ease of
use in brush/timber?

 

[mt terry d]

I chrono'd 3 rounds from my Tikka T3x .I think is 20.4" . Whatever it comes stock.

2857
2884
2876

Update: chrono'd 5 handloads

23.4 gr XBR 8208, 77gr HPBT
2797 average
2849 High
2737 Low

 

[MEdude]

Howa Mini 22”
2841fps with 12 ES
OAL 2.45