Barnes ttsx 130gn and n140 in .308 flavour
- Thread starter Utectok
- Start date
Sure, I’ve worked up loads for two 308s with this bullet and N140
The first was a 20 inch custom barrel. Tested 46.9 to 48.7g which gave 2952 to 3098fps at coal of 2.816 with Norma case and CCI 200 primer. Optimal load for this rifle is 47.9gr N140 for 3050fps which gives truly excellent accuracy and terminal performance.
The second was a factory Sako 85 that has a “slow” barrel. Charge weights were 47.1 to 49.5 gr that gave 2846 to 3013fps with coal 2.800in in Norma cases and Murom primers. There appears to be a node at 49.2 gr (3004fps) but this is a work in progress. Bear in mind that this load is compressed.
I saw no pressure signs in either rifle but as always what is safe in my rifles may not be safe in yours so work up carefully and use a chronograph if possible.
I also worked up loads with the same bullet/case in the custom 20inch tube with N135 with charge weights of 45.1 (3008fps) to 46.7gr (3125fps). I didn’t get such a well defined node with this powder but it seemed a better burn rate than N140 for this application given the limited case capacity of the 308 Win case.
The first was a 20 inch custom barrel. Tested 46.9 to 48.7g which gave 2952 to 3098fps at coal of 2.816 with Norma case and CCI 200 primer. Optimal load for this rifle is 47.9gr N140 for 3050fps which gives truly excellent accuracy and terminal performance.
The second was a factory Sako 85 that has a “slow” barrel. Charge weights were 47.1 to 49.5 gr that gave 2846 to 3013fps with coal 2.800in in Norma cases and Murom primers. There appears to be a node at 49.2 gr (3004fps) but this is a work in progress. Bear in mind that this load is compressed.
I saw no pressure signs in either rifle but as always what is safe in my rifles may not be safe in yours so work up carefully and use a chronograph if possible.
I also worked up loads with the same bullet/case in the custom 20inch tube with N135 with charge weights of 45.1 (3008fps) to 46.7gr (3125fps). I didn’t get such a well defined node with this powder but it seemed a better burn rate than N140 for this application given the limited case capacity of the 308 Win case.
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Utectok
Well-Known Member
All at Saami coal I’ll leave that till I get a load that works
Yes it is warm and I was proceeding carefully going so high. Not quite sure why the factory chamber and barrel were so much slower, even with a longer barrel. I can only assume that the longer throat on the factory barrel mitigated the rise in pressure early on in ignition.
Interestingly Barnes report 3285fps from a 24 inch Kreiger with BLC2!
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I’ve loaded up some Barnes 130grain in Lapua brass max charge was 47.1 according to there online data, where did you get your data from.
many thanks Matt
many thanks Matt
paulbshooting
Well-Known Member
46 grains N140 in sako A7 308 std barrel and 46.1 grains in R8 308, both with barnes 130 grn TTSX. R8 liked sammi seating depth, sako liked longer seating nearer the lands. Both under 1 MOA. Great bullet for deer. Wont ever shot anything else
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