mjcmichigan
Handloader
- Dec 26, 2016
- 2,403
- 364
1961 Winchester Model 70 Featherweight
22” barrel
Leupold VariX 3.1 2-8x
H4831 Sierra GameKing bullet #1820 130gn SPBT
Magnetospeed
56.2—2634
56.5—2692
56.8—2726
57.1—error no reading
57.4—2742
57.7—2757
58.0—2722
58.3—2795
58.6—2858
59.0—2866
Looking at H4831 which should be running quite a bit faster…I’m wondering if the powder is degrading.
Definitely expected to be over 3000fps by 59.0 grains and about 140 fps short.
I will set that can of powder aside and try a newer can.
56.8-58.0 looks like potentially a huge node.
Not sure I have ever seen a node that big.
So will repeat this ladder, same bullets, primers, but a can of powder made more recently.
The one I am setting aside is an old label… it is plastic, but not a modern H4831 label.
Also, I had no bullet strikes I could pull off the poster board. Very odd as I was using the bottom row. Clearly the gun need some love. Wondering what it was sited last. Can’t imagine how anything could miss that poster board at 100. But it did. Will load up some for the 25 to find where they are before next ladder.
22” barrel
Leupold VariX 3.1 2-8x
H4831 Sierra GameKing bullet #1820 130gn SPBT
Magnetospeed
56.2—2634
56.5—2692
56.8—2726
57.1—error no reading
57.4—2742
57.7—2757
58.0—2722
58.3—2795
58.6—2858
59.0—2866
Looking at H4831 which should be running quite a bit faster…I’m wondering if the powder is degrading.
Definitely expected to be over 3000fps by 59.0 grains and about 140 fps short.
I will set that can of powder aside and try a newer can.
56.8-58.0 looks like potentially a huge node.
Not sure I have ever seen a node that big.
So will repeat this ladder, same bullets, primers, but a can of powder made more recently.
The one I am setting aside is an old label… it is plastic, but not a modern H4831 label.
Also, I had no bullet strikes I could pull off the poster board. Very odd as I was using the bottom row. Clearly the gun need some love. Wondering what it was sited last. Can’t imagine how anything could miss that poster board at 100. But it did. Will load up some for the 25 to find where they are before next ladder.