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Old December 10, 2004, 11:37 AM   #1
bill k
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Proper bullet seating

I'm trying to improve my reload performance. Does anyone know how to determine the proper bullet seating dept for an indiviual rifle?

I know how to seat the bullet in the reload and to make sure it's below the maximum ssami overall cartridge length.

However when I measure the bullet depth for my rifle and reduce it by .015 the round still exceeds the maximum length. I use the Nosler reloading manual.
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Old December 10, 2004, 02:29 PM   #2
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Mag length

Bill, the lengths listed in the loading manuals are standardized lengths that will work through the magazines of most rifles. Your maximum length may well be longer than will feed from your mag.

Some target shooters load shells to single load, that won't work through a mag. They could care less if it wouldn't work through the mag. The desire to get the bullet closer to the lands of the rifling over rules the mag length.

Theory has it that the closer you can get to the beginning of the rifling, the more accuracy you can squeeze out of a rifle.
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Old December 10, 2004, 03:09 PM   #3
bill k
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Thanks for the information.
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Old December 13, 2004, 06:25 PM   #4
Smokey Joe
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BillK--you don't want the bullet actually touching the lands of the bbl--that builds up pressure very considerably in the chamber before the gases can get the bullet moving. So you do want a very small "jump" between the bullet in the case neck and the bullet entering the lands.

Can't remember the minimum proper amount of "bullet jump" and am at work so can't refer to my manuals. Check any manual and it should have a section on the minimum amount of bullet jump.
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Old January 22, 2005, 03:03 PM   #5
Harry Bonar
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case length

The best loading manual that answers virually all loading questions for rifles is "The A-SQUARE SHOOTERS MANUAL - ANY SHOT YOU WANT," It is, in my opinion the best most enlightening manual extant! It can be had on the internet from
It's really good!

Last edited by Harry Bonar; January 22, 2005 at 03:03 PM. Reason: spelling
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Old January 22, 2005, 11:45 PM   #6
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I wouldn't worry about exceeding the published max COAL. the reason is that published value is the SAMMI spec. Sadly most modern MFG bore the throat long so you can load any factory load in it. just go ahead and load it. every gun is different for every bullet. generally the best accuracy will be somewhere between .03 and .015 off the lands. you just need to tinker with it to find the sweet spot. to squeeze the absolute max accuracy you tune the powder load. then the COAL and repeat. then change to a different primer and repeat. change powders and repeat. Every time you change one thing it will effect the rest. Do this enough and you can wear out the barrel changing powders, primers and bullets. just how accurate is good enough?
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