The sooper dooper pig 300wsm project thread

[dannyb]

Finally cracked it
After not getting the velocity I wanted outta the 200gn eldx I have to admit I was starting to wonder if my super short 300wsm might've been a bit ambitious.
As you'll know I ordered some targex 190gn to try.
I loaded up a charge weight ladder based on some GRT calculations provided by @striker now I'm not gonna lie my charge weight ladder didn't inspire confidence
I got good velocity but hit pressure quite early and considering I loaded my ladder to not be near pressure I was a little surprised.
What I also noticed was that I was getting weird velocity spikes, I couldn't place the culprit and even though I was shooting for es not groups I was also quite disappointed that none of the charges shot anything close to a respectable group.
So charge weight ladder was all loaded to saami length 2.85 COAL 3 at each weight.

62gn velocity 2719, 2718 and 2786 fps
62.5gn velocity 2775, error, error
63gn velocity 2741, 2778, 2792 (pressure)
63.5gn didn't shoot as heavy bolt and flat primers previous load

As you can see velocity was a bit all over the show and even though I had a wee spike at 62gn I decided to do a seating depth ladder at 62gn then tweak the charge weight if needed after that.

So going off the info Berger punlishes on their bullets I loaded up a ladder all at 62gn but varied seating depth from 10thou off lands out to a massive 130thou off the lands
I was sceptical that the bigger jumps would shoot but this is what Berger swear by so worth a crack.

10thou: 2756, 2738, 2718
50thou: 2721, 2729, 2754
90thou: 2744, 2734, 2736
130thou: 2736, 2703, 2742

So 10, 50 and 130thou all shot similar sized groups and not particularly great which is no shock looking at the velocity spreads.
However 90tho shot a group just over 1/2 " and interestingly the velocity spread dropped to a very acceptable 10fps.
That'll do nicely, velocity was plenty enough for what I want, accuracy is on point and this should be well below pressure.
What I found interesting was that the velocity spikes seem to coincide with the seating depths that didn't shoot well.
Remember all the seating depth ladder are at the same charge weight.
Anyway, I need to load up a few more confirmation rounds just to make sure it isn't a fluke and also shoot them over a labrader as all thus data has been gathered shooting over an optical chrono which whilst it gives consistent data the velocity can vary depending on conditions.

Here are the seating depth targets.

10thou




50thou



90thou



130thou