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- Dec 22, 2012
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I was able to get out to the range last weekend to perform the OCW test I had ready for my new Savage 10T .308 win but the results have me thinking my next one might need some load/charge adjustment. I have them ready to go but the results of this one make me wonder if I should have a different powder ramp. Looking for some thoughts.
Additional Info:
Chamber seams tight Nosler fired case comes in at "Zero" on a RCBS precision mic and the throat is short a 175gr SMK touching the lands has an COAL of about 2.820"
Test 1:
Nosler Brass
175gr SMK
CCI BR2 Primers
.020" off lands
Varget, started around 40gr and stopped at 43.2 as I saw pretty flat primer with very slight cratering. (EC I saved these cases for the class I plan to take in June). Node looks like it is around 42.8gr, I will have to confirm.
Test 2 (the one in question):
Lapua Brass
178gr Hornady ELD-X
CCI BR2 Primers
.020" off lands
Varget, After a couple sighters, groups will start at 41.6 and go up by .2 till 42.6 (.2 over max according to Hornady data with Hornady brass).
The Lapua brass has slightly less case capacity and the ELD-X has a larger bearing surface which has me thinking I might want to rethink my charge ramp. Problem is that they are already to go. I guess worst case scenario if I am watching for pressure signs is the test will be over prematurely, but I hate wasting time as there is not much of it these days.
Thoughts?
Additional Info:
Chamber seams tight Nosler fired case comes in at "Zero" on a RCBS precision mic and the throat is short a 175gr SMK touching the lands has an COAL of about 2.820"
Test 1:
Nosler Brass
175gr SMK
CCI BR2 Primers
.020" off lands
Varget, started around 40gr and stopped at 43.2 as I saw pretty flat primer with very slight cratering. (EC I saved these cases for the class I plan to take in June). Node looks like it is around 42.8gr, I will have to confirm.
Test 2 (the one in question):
Lapua Brass
178gr Hornady ELD-X
CCI BR2 Primers
.020" off lands
Varget, After a couple sighters, groups will start at 41.6 and go up by .2 till 42.6 (.2 over max according to Hornady data with Hornady brass).
The Lapua brass has slightly less case capacity and the ELD-X has a larger bearing surface which has me thinking I might want to rethink my charge ramp. Problem is that they are already to go. I guess worst case scenario if I am watching for pressure signs is the test will be over prematurely, but I hate wasting time as there is not much of it these days.
Thoughts?