nksmfamjp
Well-Known Member
- Joined
- Jan 5, 2004
- Messages
- 3,200
I was an OCW guy, but it uses a lot of rounds, doesn't allow me to focus through each group. Velocity data is a bit hard to collect too.
I didn't really get how to do ladders, but I'm getting better. I have a method now. I used to loose track of the shots.
So my new method:
Run a ladder of my lowest acceptable velocity thru a couple grains over max. I use about 0.8% increments. Use some logical OAL....SAMMI, book, mag length, lands minus 0.030". I shoot until I get excessive bolt lift, case head expansion or other issues....I record max acceptable charge and min acceptable charge based on velocity. I should also be able to identify something close to a node there.
Then run 5 ocw groups centered at that node. 3 shot groups. Vary charge weight. Use the same OAL. Shoot low to high.
Then run 5 ocw groups vary oal. Berger method. 5 shot groups from here on...
Then run 5 ocw groups vary charge weight at 1/2 last increment.
When charge increments are 0.1gr, stop adjusting charge weight, but continue with oal. Until You get your best group that repeats.
Then try another primer, if accuracy seems off. This becomes a bit of a start over when you switch primers.
Sometimes at the beginning, it maybe worth running the ladders with multiple powders and bullets to see which pair work together.
To be clear i'm not doing this yet...
Am I missing something key here? Is there a faster way?
i'm just looking for feedback or shortcuts you know.
I didn't really get how to do ladders, but I'm getting better. I have a method now. I used to loose track of the shots.
So my new method:
Run a ladder of my lowest acceptable velocity thru a couple grains over max. I use about 0.8% increments. Use some logical OAL....SAMMI, book, mag length, lands minus 0.030". I shoot until I get excessive bolt lift, case head expansion or other issues....I record max acceptable charge and min acceptable charge based on velocity. I should also be able to identify something close to a node there.
Then run 5 ocw groups centered at that node. 3 shot groups. Vary charge weight. Use the same OAL. Shoot low to high.
Then run 5 ocw groups vary oal. Berger method. 5 shot groups from here on...
Then run 5 ocw groups vary charge weight at 1/2 last increment.
When charge increments are 0.1gr, stop adjusting charge weight, but continue with oal. Until You get your best group that repeats.
Then try another primer, if accuracy seems off. This becomes a bit of a start over when you switch primers.
Sometimes at the beginning, it maybe worth running the ladders with multiple powders and bullets to see which pair work together.
To be clear i'm not doing this yet...
Am I missing something key here? Is there a faster way?
i'm just looking for feedback or shortcuts you know.
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