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Rifles, Reloading, Optics, Equipment
Reloading
243 ladder test h4350 help
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<blockquote data-quote="fisherman987" data-source="post: 1944231" data-attributes="member: 107270"><p>You have been given some really great advice here by some smart guys. If I were summing up what I think is the best from these guys I'd say you need to do your test over doing the following things.</p><p></p><p>1. Get a piece of cardboard and paste your bulls eyes carefully on a perfectly straight line going left to right. Hang your target so line is level to the earth. Use bullseyes that have a nice small center and really focus on that exact spot when shooting and follow through to aid with consistency.</p><p></p><p>2. Shoot 2 to 4 shots of each charge noting velocities with the best chrono possible. As you go up in charge, take note of any pressure signs or heavy bolt lift which indicate maximum charge for that bullet and powder charge.</p><p></p><p>3. Primarily look at where bullets are going as the load changes not necessarily velocity. What you are looking for is for all the bullets to be as close as possible to the same vertical plane regardless of velocity or horizontal spread.</p><p></p><p>4. Once you have identified a charge weight where there is little to no verticle spread, do a seating depth test again with at least 3 shots per group to find the tightest group, then refine your charge weight using that seating depth to hopefully find a good tune for your barrel.</p><p></p><p>5. As a side note, if you don't do this testing on a virtually windless day, you're going to have bullets all over the place which will totally confuse and frustrate you so at least hang up a piece of surveyors tape so you have some idea what the wind is doing to your shots. If it is virtually windless, longer ranges are best for testing, if you have some wind conditions, test at 100 yards to minimize the wind effects. And remember, as you adjust the charge weight, you are really only looking for the least <strong><u>verticle </u></strong>spread. The velocity doesn't really matter at this point, because if you have truly found a good node it will be forgiving of velocity differences anyway. When you do your seating depth testing, you will tighten up the <strong><u>horizontal </u></strong>and the overall group size.</p><p></p><p>6. Also, don't be surprised if your groups move up, down, or side to side as the charge increases. This is due to the barrel "whipping" around before the bullet leaves the barrel so the bullet is leaving the barrel when it is pointing in a slightly different place each time. This is why you are running the charge weight test, to find the perfect time for the bullet to leave the barrel so you don't have extreme vertical spread.</p><p></p><p>Hope this helps</p></blockquote><p></p>
[QUOTE="fisherman987, post: 1944231, member: 107270"] You have been given some really great advice here by some smart guys. If I were summing up what I think is the best from these guys I'd say you need to do your test over doing the following things. 1. Get a piece of cardboard and paste your bulls eyes carefully on a perfectly straight line going left to right. Hang your target so line is level to the earth. Use bullseyes that have a nice small center and really focus on that exact spot when shooting and follow through to aid with consistency. 2. Shoot 2 to 4 shots of each charge noting velocities with the best chrono possible. As you go up in charge, take note of any pressure signs or heavy bolt lift which indicate maximum charge for that bullet and powder charge. 3. Primarily look at where bullets are going as the load changes not necessarily velocity. What you are looking for is for all the bullets to be as close as possible to the same vertical plane regardless of velocity or horizontal spread. 4. Once you have identified a charge weight where there is little to no verticle spread, do a seating depth test again with at least 3 shots per group to find the tightest group, then refine your charge weight using that seating depth to hopefully find a good tune for your barrel. 5. As a side note, if you don't do this testing on a virtually windless day, you're going to have bullets all over the place which will totally confuse and frustrate you so at least hang up a piece of surveyors tape so you have some idea what the wind is doing to your shots. If it is virtually windless, longer ranges are best for testing, if you have some wind conditions, test at 100 yards to minimize the wind effects. And remember, as you adjust the charge weight, you are really only looking for the least [B][U]verticle [/U][/B]spread. The velocity doesn't really matter at this point, because if you have truly found a good node it will be forgiving of velocity differences anyway. When you do your seating depth testing, you will tighten up the [B][U]horizontal [/U][/B]and the overall group size. 6. Also, don't be surprised if your groups move up, down, or side to side as the charge increases. This is due to the barrel "whipping" around before the bullet leaves the barrel so the bullet is leaving the barrel when it is pointing in a slightly different place each time. This is why you are running the charge weight test, to find the perfect time for the bullet to leave the barrel so you don't have extreme vertical spread. Hope this helps [/QUOTE]
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