bullet dimensional diagrams
- Thread starter ras_oscar
- Start date
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guzma393
Active Member
The only bullet diagrams I come across are those for cast bullet molds. Best thing to do is just to hit up the micrometer/calipers and analyze and log the bullet dimensions and feature you are using on a spreadsheet.
Blacksmith101
Grumpy Old Man
- Jun 22, 2012
- 22,288
Bullets are not standardized so you could have two .308 diameter bullets that each weighed 147 grains but the profile would be different.
They could have different ogives or meplats, flat base or boattail, etc.
https://www.accurateshooter.com/ballistics/tangent-vs-secant-vs-hybrid-ogive-bullets/
They could have different ogives or meplats, flat base or boattail, etc.
https://www.accurateshooter.com/ballistics/tangent-vs-secant-vs-hybrid-ogive-bullets/
Doco Overboard
Ultimate Member
Ballistic charts/engineering drawings are out there especially for 30 cal bullets but not always easy to obtain or posses.
Because of the richness of some of the information they contain they could be considered an embarrassment to some manufactures and modern writers.
Reinventing the wheel and spoon feeding comes to mind if you ever have the opportunity to see some of them.
Sooo, With reloading components in short supply, I pulled the trigger on some .308/147gr bullets. I haven't received them yet. I suspect they are NOT boat tail. The .30 cal loads I have worked up previously (for .308 Win and 30-06/M1 Garand) both had a boat tail. I have conclude boat tail and non-boat tail projectiles are interchangeable because:
1. The Lee manual has zero information on bullet shape, they only show the completed cartridge for dimensional purposes
2. The Hornady manual has several bullets pictured for my particular weight, they show both boat tail and non boat tail above a common table of charges
Please confirm or correct my conclusion
1. The Lee manual has zero information on bullet shape, they only show the completed cartridge for dimensional purposes
2. The Hornady manual has several bullets pictured for my particular weight, they show both boat tail and non boat tail above a common table of charges
Please confirm or correct my conclusion
- Feb 4, 2013
- 28,175
A prudent reloader would reduce the load by a few grains and work it back up.
Just sayin'
Just sayin'
I have done what Pinecone suggests when changing mfg. Usually 2-3 loads at .2- .3gr increments starting about 1 grain below a rifle formula. If there were signs of overpressure, you would see them as you are working your way up.
IF I took better notes I'd have kept chrono data on more than my final loads.
FWIW, BT and Flat base Sierra Pro hunters have been almost interchangeable for me (within 100 yards). POI did require scope adjustments. For my Garand use, I've yet to find a 147-150fmj that did not chrono an average of 20fps with each other with my Garand formula. I just bang steel with those so if POI shifts an inch or so, don't care much. Heck, outdoor temp does that anyway.
I am early in reloading, but I’ve been doing that. Got an MTM reloading log book a week ago and transferred my notes from my loose leaf notebook to it to stay better organized. I am probably just going to reload the most accurate or powerful or good enough plinking load over and over. But I wanted to make sure I had it in my notes for as much “why” as anything. Or maybe I want to load a bunch of stout 147 9mm for something and then some plinking ones.
Also notes like “loaded .960” COAL. Any longer hits the lands of Yugo model 70”.
I’ve got a similar note for my Glock 17 with Swenson barrel (actually I think it is 1.000” or something like that with FMJ 115gr RMR bullets).
Little things like that so when I go to play with a load I know the why’s instead of trying to remember them.
sooo.. my .308 bullets came today. They are indeed nonboat tail. They are also a smidge shorter than the .308 FMJ BT. The difference is from the canalure to the tip. The distance from the cananlure to the base is identical.
My established COL with BT projectiles is as follows:
308 2.810
30-06 3.815
BT projectiles are a total of 1.132 long
Non BT are a total of 1.026 long
from base of the bullet to top of cananlure is .356 for both.
Am i correct to assume i should shorten up the COL for these bullets to maintain the seating depth and a ensure the case mouth falls at the canalure?
My established COL with BT projectiles is as follows:
308 2.810
30-06 3.815
BT projectiles are a total of 1.132 long
Non BT are a total of 1.026 long
from base of the bullet to top of cananlure is .356 for both.
Am i correct to assume i should shorten up the COL for these bullets to maintain the seating depth and a ensure the case mouth falls at the canalure?
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