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

[Watcher]

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

[Akeld]

Gordons reloading tool, seems a bit daunting at first but worth playing around with, few tutorials on youtube on how to use it

[Watcher]

6 minutes ago, Akeld said:

Gordons reloading tool, seems a bit daunting at first but worth playing around with, few tutorials on youtube on how to use it

Thank you.

[DaveT]

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.

[Re-Pete]

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

[Richiew]

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 

 

[Richiew]

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 

[Richiew]

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

[Richiew]

Please measure for your col as my tikka with some bullets would be well jammed into the rifling using the info above . 

[Watcher]

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

 

[Re-Pete]

And the cartridge length?

[Watcher]

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