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Old December 24, 2013, 09:48 PM   #1
mwdsonny
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Question About Lymans reloading manual.

Im gonna try to explain this as simply as possible. My Lymans reload manual shows for .223 max length as 2.260" but then for 52gr jhp it has 2.250" so my question is is the 2.250 a min and that for any gr bullet my max is the number listed in the top above the individual gr bullets? so my safe range for a 52gr jhp 2.250-2.260" or should i be below the 2.250? and if below how much is to much? i know deep seating a bullet can cause serious pressure build up. but maybe im over looking it but i dont see a variance listed for the loads. i loaded some yesterday and today and in my example i thought the oal listed was max so i stayed .010 or so less so i was getting like 2.242 and simular in other calibers. now im thinking that number might have been a min safe and not max safe like i thought at first. i have shot 3-6 rounds of 3 different load setups with no negative effects. but i did stay at about 25% the powder load range. for example my .380 had a range of 2.9-3.6gr i hand meassured 3.1gr for each. so are the rounds safe to shoot if i undercut the min but stayed on the low side of powder?
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Old December 24, 2013, 10:28 PM   #2
mehavey
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The 2.26" max dimension is listed to ensure the round will fit in the magazine.
It does not mean seat every bullet to that length.

Seat at the listed overall length for each bullet design/weight. That guarantees proper shank
depth in the neck. It also ensures design bullet shape/throat engagement clearances.

The related powder loads are tested using those dimensions.

Last edited by mehavey; December 24, 2013 at 10:33 PM.
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Old December 24, 2013, 11:28 PM   #3
mwdsonny
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So the 2.25 is the max for the 52gr jhp? So my question is how much under that is safe? I mean I know 2 is unsafe but would 2.2 be ok?
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Old December 25, 2013, 12:40 AM   #4
bt380
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Lee 2nd edition p 179 jacketed bullet has reloader 10 start gr 19.8 max gr 22.5 with min oal 2.200.
Reloader 7 start 18, max 20.5 same min oal 2.200
No 52 gr in Hornady
Nothing for Hodgdon's 2013 annual manual
Note the Lymans mention JHBT (boat tail for 52 grains) and you mentioned JHP.
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Old December 25, 2013, 01:31 AM   #5
mwdsonny
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You are correct. jacketed hpbt is whats listed in the 48th edition that i am using, but my question is is the number listed above the powder amounts a min or max oal.
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Old December 25, 2013, 01:33 AM   #6
mwdsonny
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Old December 25, 2013, 01:33 AM   #7
rg1
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Depends on the 52 grain HP bullet you're using. Different bullets will have a different ogive and tip shape. Sierra 52 Match HP's have a longer tapered point than some others. Sierra and Lyman which tested the 52 grain Sierra bullet list an overall length at 2.250". Other 52 grain HP's such as Speer's have a different ogive and Speer tested them at 2.200" Hornady 52 gr. BTHP's were tested at an overall length at 2.230". Depends on the manufacturer and also on what firearm you're shooting them through also. Bolt action and AR's will have different length chamber throats.
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Old December 25, 2013, 01:38 AM   #8
mwdsonny
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The above pic is what I was using to make my 115gr jhp .380. The book says that for .380 the max length (given in area with all bullet dimentions(case diameter and all)) is .984 but the 115gr jhp shows .956. i was doing like .951ish was i under the min, or in the safe area? Im wondering if it should have been between .956 min and .984 max.
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