Jump to content
UKV - The Place for Precision Rifle Enthusiasts

Where can I find load data to help me start on a .223 with a 1 in 7 twist barrel?


Recommended Posts

I've had a 1 in 7 twist barrel put on my Savage .223 and now that we are coming out of lockdown I want to start to work on loads. I'm struggling a bit to find the load data for a faster twist barrel to help me determine a safe starting point. I'm going to start with some 77 grain Lapua bullets but Lapua only provide data for a 1 in 12 twist. TIA Watcher

Link to post
Share on other sites

The twist rate will not be a factor in your load tests...it is fast enough to STABILISE the 77g bullets but won't cause an increase in pressure from a given load.

Just use the load data from Vhitavouri with N140 and you will be fine.

Link to post
Share on other sites

When you've decided on a powder and you have a cartridge overall length, post them and I'll run QL for you.

FWIW, I use RS52 with 73 and 80 grain bullets. What length is your barrel?

Pete

Link to post
Share on other sites

Lapua web gives info for 1-7” twist 

75 g hornadyhpbt 

N135 20.7-23.3

N 140 22.1-25.0

N540 23.1-25.8 .

77g Sierra hpbt

N530 19.8-22.1

N135 19.6-22.5 

N140 21.0-24.7 

N540 22.7-25.3 

73 g bergers work well with 22g n135 in tikka t3x stainless varmint 

 

Link to post
Share on other sites

Sorry meant to say Vihtavuori web shows this info . If the page your looking at is just a massive list tap on the wanted bullet and it gives an option to fill in your info and also has the twist rate . This is the page with a dark background. There is another with a white background that shows different twists and throat lengths used . 
cheers 

Link to post
Share on other sites
1,47 22.7 786 786 1,68 25.9 903 2963
 
Bullet 4,9 g / 75 gr BTHP(2, Hornady C.O.L. 57,4 mm / 2.260 inch
 
Powder Starting load Maximum load
Type Weight Velocity Weight Velocity
[g] [grs] [m/s] [fps] [g] [grs] [m/s] [fps]
N135 1,34 20.7 752 2467 1,51 23.3 830 2723
N140 1,43 22.1 754 2474 1,62 25.0 843 2766
N540 1,50 23.1 773 2536 1,67 25.8 863 2831
2) 1 in 7” twist
 
Bullet 4,9 g / 75 gr ELD Match, Hornady C.O.L. 57,4 mm / 2.260 inch
 
Powder Starting load Maximum load
Type Weight Velocity Weight Velocity
[g] [grs] [m/s] [fps] [g] [grs] [m/s] [fps]
N530 1,33 20.5 777 2549 1,51 23.3 887 2910
N135 1,38 21.3 766 2513 1,58 24.4 876 2874
N140 1,48 22.8 769 2523 1,70C 26.2C 889 2917
N540 1,47 22.7 791 2595 1,67C 25.8C 901 2956
C – Compressed load
 
Bullet 4,9 g / 75 gr Scirocco II, Swift C.O.L. 57,4 mm / 2.260 inch
 
Powder Starting load Maximum load
Type Weight Velocity Weight Velocity
[g] [grs] [m/s] [fps] [g] [grs] [m/s] [fps]
N530 1,28 19.8 708 2323 1,45 22.4 814 2671
N135 1,23 19.0 698 2290 1,45 22.4 795 2608
N140 1,41 21.8 718 2356 1,62 25.0 815 2674
N540 1,43 22.1 743 2438 1,64 25.3 846 2776
 
Bullet 5,0 g / 77 gr Lapua, Scenar C.O.L. 57,4 mm / 2.260 inch
 
Powder Starting load Maximum load
Type Weight Velocity Weight Velocity
[g] [grs] [m/s] [fps] [g] [grs] [m/s] [fps]
N530 1,25 19.3 712 2336 1,44 22.2 812 2664
N135 1,22 18.8 701 2300 1,39 21.5 803 2635
N140 1,35 20.8 704 2310 1,57 24.2 801 2628
N540 1,41 21.8 720 2362 1,59 24.5 814 2671
 
Bullet 5,0 g / 77 gr HPBT(2, Sierra C.O.L. 57,4 mm / 2.260 inch
 
Powder Starting load Maximum load
Type Weight Velocity Weight Velocity
[g] [grs] [m/s] [fps] [g] [grs] [m/s] [fps]
N530 1,28 19.8 712 2336 1,43 22.1 795 2608
N135 1,27 19.6 706 2316 1,46 22.5 791 2595
N140 1,36 21.0 712 2336 1,60 24.7 810 2657
N540 1,47 22.7 740 2428 1,64 25.3 828 2717
2) 1 in 7” twist
Link to post
Share on other sites
9 hours ago, Re-Pete said:

When you've decided on a powder and you have a cartridge overall length, post them and I'll run QL for you.

FWIW, I use RS52 with 73 and 80 grain bullets. What length is your barrel?

Pete

Pete,

Its 27 inches.

Matthew

 

Link to post
Share on other sites
On 4/26/2021 at 8:06 PM, Re-Pete said:

And the cartridge length?

Peter,

If you mean COAL then I can't say at the moment. I have an OAL tool but am having some cartridges drilled to fit. If its just the cartridge then its a standard .223 Rem from Lapua - I've included that in the 27 inches for the barrel. Sorry if this isn't what you meant. 

Matthew

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

Lumensmini.png

CALTON MOOR RANGE (2) (200x135).jpg

bradley1 200.jpg

NVstore200.jpg

blackrifle.png

jr_firearms_200.gif

valkyrie 200.jpg

tab 200.jpg

Northallerton NSAC shooting.jpg

RifleMags_200x100.jpg

dolphin button4 (200x100).jpg

CASEPREP_FINAL_YELLOW_hi_res__200_.jpg

rovicom200.jpg



×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use and Privacy Policy