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The AR2213sc result looks REALLY good Puku. I think that is correct in that the node is very broad - which is a great result to get early on. Within this range there is presumably an accuracy optimum that could be identified by shooting groups at 59.5, 60.0, and 60.5gn. If you have the resources maybe the two outside loads at 59gr and 61gr are worthwhile.
In my limited experience with Berger VLDs (in 7mm and .257) the seating depth seemed to be the parameter to nail down first. I couldn't get any decent groups with changes in powder with the depth not optimised. However to get the kind of cluster you already have over a 2gr variation in powder you must either be close to the right depth already or have a barrel that isn't fussy. Either way the early signs are that you've got a tackdriver. I'm very envious.
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Yes these are seated 0.010" from the lands and fit into the mag. Earlier on I had used another depth which I can't remember at present but the clusterings were not as tight as here. So from reading other people's reports I decided to restart the load development. I.E. start 0.010" from the lands, find your powder weight where pressure is felt and number one accuracy is good. Then adjust seating depth to find the 'spot' for THE rifle.
Considering that this is a tikka T3 Hunter and its shooting like this with VLD's that fit the mag I'm stoked. As it was going to be fix/adjust the magazine.
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Far out 5mm groups. I could only wish of being able to do that.
Tussock do you notice change in group size at maybe 300m? I am wondering because in my theory won't groups grow vertically with higher ES figures.
On a different note the 150gn burgers seem to be pushed right with more pressure (I don't think I said in the earlier post that the last shot of ar2213sc had pressure signs). But with the 140gn accubonds the projectile gets pushed vertically with higher pressure.
Please note this is not scientific but just my observations while at the range. I should also say that the indicator of high pressure I see in this rifle is a sticky bolt lift. No case marks, and only slight primer flattening.
Puku
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Tussock, could I ask what powder you are using that has allowed fine tuning to the centre of a 0.5gr wide node and then maintains that level of accuracy with temperature variation ? 2213sc / H4831sc ? I don't think the RE-25 I'm using would work with a node that narrow - and the nodes in the .280 here are shaping up as being that narrow - so I'm looking for something a bit more stable to swap over to.
