02-01-2022, 02:45 AM
updates - Wilson gave me a reply on the reamer used, it's a standard SAAMI chamber. No proprietary freebore. I t has been my experience that Sierra MK's, Barnes MB's, and Nosler CC's generally prefer about a .025 to .050 "jump". After doing some measurements and using the Sharpie method of determining "touch" I seated 50 bullets at 2.228, took them to the range with a portable press and did a seating test. I found they grouped best@ 2.188 or about .040 from touching the lands. Last 5 bullets were then seated at 2.188 and fired with my Magnetospeed chrono. Speed was 2263 FPS with a SD of 28 and ES of 61. A bit disappointing for long range purposes.
best group was .690 but I had a few others that hovered around 1 inch. I do believe the barrel might be just starting to settle in but a change in powder or primer or both may get the ES/SD down a bit. More testing is planned, a couple of other powders followed by testing 140 gn Bullets unless I can find a good supply of 120 grain Nosler, Sierra or Barnes 120's
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best group was .690 but I had a few others that hovered around 1 inch. I do believe the barrel might be just starting to settle in but a change in powder or primer or both may get the ES/SD down a bit. More testing is planned, a couple of other powders followed by testing 140 gn Bullets unless I can find a good supply of 120 grain Nosler, Sierra or Barnes 120's
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