300gr Hornady HP H4198 H010

[bradf]

Did a OCW 57-60 gr H4198 Win LR Mag Primer trimmed 2.095" Moderate crimp

gr fps 100yd group "
57 2260 2.1 SD- 16
58 2295 2.5 SD- 19 vertical string
59 2324 2.2 SD- 14
60 2357 1.9 SD- 13

No significant signs of pressure. Primers were all flat, noticeably flatter than my 63 gr 8208XBR loads which were 2050 fps and the tightest group.

[Hunter5567]

Well that should equal or outdo the 405 Winchester in power. Flattened primers are a pressure indicator. I can imagine they had a good kick to them.