If anyone would just happen to have some Sierra .38/.357 158 gr. JSP listed as .357" I would greatly appreciate someone taking an actual diameter measurement of a few with a micrometer or quality calipers. Thanks.
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Sierra .38 Cal 158 gr JSP Anyone ?
- Thread starter geo57
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What problem are you seeing?
I apologize,,,Diameter and I added that to the OP.. Thank you.
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I asked for this same help on another site. FWIW, one fellow's mic read.357" and another guy measured about 10....3565"-.357"
This world is not perfect and some barrels are not all the same dia.
I have one picture of a 9mm test, where they actually used a light .38 cal , JHP bullet, in their test
from a Ransom rest, with 50 round, groups.
I have one picture of a 9mm test, where they actually used a light .38 cal , JHP bullet, in their test
from a Ransom rest, with 50 round, groups.
My question and request concerned chamber throats and jjrr gave me what I needed.
I have some 125 gr sierras and they measure about .3565 and some 45 tournament masters that are exactly 0.4515 as marked. I got my mics with the vernier out of my cold shop and when they warm up some I am going to take some more measurements but I don’t expect anything different.
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If you want an accurate reading on a bullet diameter, a good micrometer is the only instrument to use. The measurement will be approximate if using a caliper.
With jacketed bullets, the diameter is often not critical for good accuracy. Slightly undersize will often work as well as full diameter.
With jacketed bullets, the diameter is often not critical for good accuracy. Slightly undersize will often work as well as full diameter.
