Author Topic: 48 grain .25 bbt  (Read 167 times)

oneshot61

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48 grain .25 bbt
« on: July 28, 2018, 04:07:22 PM »
I’ve been testing these in my .25 ace with some frustration. My barrel likes some things .251, some bullets a bit larger. These come in around .251 heavy unsized. After 150 rounds, I figured it out for my barrel. Sized to .251 then knurled heavy between two files. Pushing these at 980 @ 50 yards. I pulled one big time so I shot another one just to keep it honest. Honestly having a shaky day shooting but I’m liking this for my gun. I’ll stretch them out on another day to 100 yards.
 I liked the bbt 50 grain fp, but this hp is shooting faster and just as accurate. I’ve also seen what these hp can do upon impact.



Christopher

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Re: 48 grain .25 bbt
« Reply #1 on: July 29, 2018, 04:51:21 AM »
Wow, nice shooting! What is the purpose of the knurling? Not questioning your methods, they obviously work, just wanting to learn. Why do think the accuracy improves with the knurling? Thoughts, theories, etc.....

Thanks for sharing,
Chris
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oneshot61

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Re: 48 grain .25 bbt
« Reply #2 on: July 29, 2018, 08:44:59 AM »
Wow, nice shooting! What is the purpose of the knurling? Not questioning your methods, they obviously work, just wanting to learn. Why do think the accuracy improves with the knurling? Thoughts, theories, etc.....

Thanks for sharing,
Chris
I have tried .251,.252,.253 in this gun with varying results with different bullets. I knurl bullets sized to .251 and through testing, it’s the right combo. I lay the sized bullet between two medium files and roll the bullet by pushing the top file back and forth with constant pressure, the more rolled the more defined the knurling. This will leave ridges standing up and when chambered and shot, the ridges will form themselves to the exact size of the barrel, especially if shooting through a choked barrel. Some barrels, my .22 jkhan for instance, I size the 28 grain hp bbt to .216, no knurling, and it’s dime sized groups at 50 yards. Each barrel is different, you just have to take the time to find out what your particular barrel likes. On this one, I went through as cast, lubed, not lubed, knurled.. lubed not lubed.Then I went to .251, same process. I shot about 150 bullets before finding the right combo because I also test at different pressures/speeds.
« Last Edit: July 29, 2018, 08:47:49 AM by oneshot61 »