Post by: Stein on September 23, 2020, 11:40:45 AM
I know that as I go shorter, the pressure will go up and the velocity will go up (assuming everything else stays the same). After the first round of testing, I'm showing a definite improvement in group sizes as I go smaller, so I want to go down several more steps to see if I can tighten them up more and where a nice band is.
My question is whether there is a safety issue with going too short? I'm checking to make sure the load isn't compressed and would stop if I couldn't hear powder freely shaking in the loaded round. My concern is that even though it's a mild load, I don't have any way to understand if the increase in pressure will go above SAAMI or not or if it's a minor or major change in pressure as I go shorter.
Post by: BULLBLASTER on September 23, 2020, 11:47:37 AM
Post by: Jonathan_S on September 23, 2020, 12:13:47 PM
Post by: Stein on September 23, 2020, 12:17:28 PM
That's a real mild load (WSM?) I think you'd have a real hard time hitting pressure with a lightweight Barnes and that charge.
30-06, forgot to mention. Yeah, it's pretty light but was the most accurate in my load testing. I went all the way up until the primer started to bulge and this was the clear winner. I had a decent velocity node around 57, but not as good and nothing exciting above that.
Post by: Jonathan_S on September 23, 2020, 12:26:27 PM
Post by: Stein on September 23, 2020, 12:28:09 PM
Post by: CaNINE on September 23, 2020, 01:30:29 PM
Post by: Mtnwalker on September 23, 2020, 01:33:47 PM
Stein - 0.003 is a pretty small increment to work with, let alone maintain on a reliable/repeatable basis. I suggest working with a minimal increment of 0.010 when testing seating depth sensitivity. :twocents:
Barnes recommends starting at .050 and working in .025 increments I believe
Post by: buckfvr on September 23, 2020, 01:41:11 PM
Post by: NWShooter on September 23, 2020, 03:06:50 PM
Stein - 0.003 is a pretty small increment to work with, let alone maintain on a reliable/repeatable basis. I suggest working with a minimal increment of 0.010 when testing seating depth sensitivity. :twocents:
I agree. I would do it in .020 increments. Then fine tune from there.
Post by: jasnt on September 23, 2020, 07:08:02 PM
Post by: Magnum_Willys on September 23, 2020, 07:44:04 PM
Post by: mountainman on September 23, 2020, 09:19:51 PM
I go .010 to .035 in .005 steps. If nothing good use .060, .090, .0120 to see if close then refine .005 steps.This👆
Post by: TheArmoredShop on October 13, 2020, 08:00:36 AM
Post by: Jonathan_S on October 13, 2020, 09:11:13 AM
Post by: Stein on October 13, 2020, 09:13:43 AM
I did a bunch of experiments and can now load to 1 thou accuracy in seating depth reliably.
It only took me 5-6 depths to find it. I’m sure there are better depths if i went further, but .36 moa is plenty good and likely the best I can shoot.
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Post by: TheArmoredShop on October 13, 2020, 01:07:48 PM
Stein - 0.003 is a pretty small increment to work with, let alone maintain on a reliable/repeatable basis. I suggest working with a minimal increment of 0.010 when testing seating depth sensitivity. :twocents:
I can hit .003” increments all day long with Redding competition seating dies with the micrometer adjustment dial. That’s why they are so expensive. .003 can make a difference
Post by: Stein on October 13, 2020, 01:18:01 PM
I found there were fairly big differences in grouping changing the depth by .003 jumps. I think if you go .01 or .015 jumps you would miss some nice groups, plus I didn't want to go any shorter than I needed to as I'm already jumping a bunch due to the magazine limitation.