9mm Reloading - Seating \ Crimping Question

This is a discussion on 9mm Reloading - Seating \ Crimping Question within the Reloading forums, part of the Defensive Ammunition & Ballistics category; Well Ive been using my Lee Breech Lock 50th Anniversary kit and RCBS Carbide Dies this weekend on my first stint at reloading. Ive deprimed, ...

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Thread: 9mm Reloading - Seating \ Crimping Question

  1. #1
    Member Array heylin's Avatar
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    9mm Reloading - Seating \ Crimping Question

    Well Ive been using my Lee Breech Lock 50th Anniversary kit and RCBS Carbide Dies this weekend on my first stint at reloading.

    Ive deprimed, sized, belled and primed about 500 cartridges and am addicted already :). Im ready to get my powder now and have a couple questions about seating and crimping with my RCBS dies (does the seat and crimp in one step).

    I played around the crimping setting so the bell was removed and got the seating depth set so that it was identical to the factory rounds I have been using (give or take 0.01 inches). Rounds chambered fine in my Glock, Para and Taurus.

    Question 1) is 0.01 inches variance OK for the case length ?

    Question 2) should I be using the rounded or flat seating plug for Round nose FMJ ? (the RCBS instructions arent very clear)

    Question 3) provided my seating depth is correct and my crimp is correct is there anything I need to wary of in regards to excessive pressure due to bullet being held in place too tight ? how tight is too tight ? is there any way to tell ?
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    Senior Member Array boscobeans's Avatar
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    I took out 4 different brands of NEW FACTORY ammo in 9mm.
    All showed an outer measuremnet at the crimp to be .376 inches.

    My reloads in 9 mm. were checked and they are also at .376 inches.

    They were made on RCBS equipment and tapered to match factory ammo.

    Q#1 Most ammo is speced out to the .000 (thousandth's of an inch)
    As far as case length goes, most straight walled brass doesn't lenghten that much.. Once fired brass or new brass should be close to if no dead on with specs out to a few thousandth's of an inch.

    Q#2 Use the rounded bullet seater. Prevents you from setting the bullet at an angle.

    Q#3 If you can just see the outline of seated bullet in the brass, your crimp should be fine. Too tight and you may deform the bullet or buckle the brass.

    bosco
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    Member Array heylin's Avatar
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    Oops sorry for Q1, I meant the finished catridge length was 0.01 inches shorter then factory round, possiby less.

    All my brass is twice fired so as you say it should be 0 variance in case length as its pretty much new brass in reloading terms.

    a factory round sits firm in my calipers, and my finished round just manages to wiggle through the same gap with some effort, so its nearly in spec, just seated a hair deeper.

    I would play around the seater plug more, but if its clsoe enough I would rather leave it than risk going to long.
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  5. #4
    Senior Member Array boscobeans's Avatar
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    A hair ( a few .000 of an inch or so ) deeper with the same weight and bullet configuration should be fine, UNLESS YOU ARE WORKING WITH MAXED OUT LOADS.

    Remember shape/type of bullet matter, a 124grain FMJ will be a slight bit shorter than a hollow point of the same weight (normally).
    bosco

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    Member Array heylin's Avatar
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    Thank for all the info guys.

    My loads are at the bottom end of the range. Max load for 115gr FMJ using ADI-AP70N is 5.0gr, i'll be aiming for 4.5-4.8 range.

    Projectiles im using are the same as the factory rounds (Lapua) I order them direct from the ammo manufacturer and am using the same brass again, so any completed rounds are 100% identical in components.
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    Senior Member Array boscobeans's Avatar
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    I am not that familiar with ADI powders but from what I have read AP70N is the same as CLAYS. If it is 5.0 grains is a fairly HOT load.

    bosco

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    VIP Member Array edr9x23super's Avatar
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    follow the reloading guide! in the guide are the SAAMI specs for each caliber loading. If you are just starting out, this should be your bible, no exceptions!

    The reloading guide will have all of the info you are seeking to get secondhand here. The 20 bucks you spend on that guide will be the best you ever spent....
    "Guard with jealous attention the public liberty. Suspect everyone who approaches that jewel. Unfortunately, nothing will preserve it but downright force. Whenever you give up that force, you are inevitably ruined". - Patrick Henry

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    Member Array heylin's Avatar
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    ADI say AP70N is equivalent to Hodge Universal, both are a medium burn rate and suitable for wide range of pistol and rifle calibres.

    The ADI load data I have (from ADI) says 4.5 start - 5.0 max for 115gr FMJ which I will be using.

    Can I take the powder manufacturers word as gospel ?, also is there any harm starting lower than manufacturers start load ? say 4.3 grains ?.
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    Member Array Ghuqu2's Avatar
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    Remember OAL is a MINIMUM, not a max length. You can go over w/ little problem (as long as fits in the mag), but NEVER under. Don't just compare w/ factory ammo, follow the published recipe! As I see it ap70n=Universal (according to this chart). My Lee manual says min. OAL for Universal w/ 115gr fmj is 1.125.
    "The millions of people, armed in the holy cause of liberty, and in such a country as that which we possess, are invincible by any force which our enemy can send against us." Patrick Henry 1775

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    TOF
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    The best advice we can give a new reloader that is several thousand miles away is to follow your load chart religiously untill you get some experience.

    Don't worry about what factory ammo OAL is. Load to the OAL called for in the chart for your specific powder bullet and charge. I consider + or - .003" acceptable.

    Don't assume or even accept someone elses statement that X and Y powder are equal. Find a load chart for the specific powder you are using or I reccomend you not use it.

    Start as close to the bottom of the charge range as practical. Work your way up to heavier charges after evaluating primer, reaction of gun etc.

    A chronograph is not absolutely necessary but certainly usefull for comparing to the expected result.

    Have fun and stay safe.
    "Those who hammer their guns into plows will plow for those who do not." - Thomas Jefferson

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    Senior Member Array boscobeans's Avatar
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    As stated by TOF """Don't assume or even accept someone elses statement that X and Y powder are equal. Find a load chart for the specific powder you are using or I reccomend you not use it."""

    It is too easy to mess up when trying to equate powders. Example..
    Clays is not Universal Clays...

    Go with what a reloading handbook or powder manufacturer (geared to the powders in your part of the world) says.

    bosco

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    Member Array heylin's Avatar
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    Not sure if I mentioned but the ammo I refer to as Factory is actually reloaded ammo already, a local gunshops gets once fired winchester brass from police academy and reloads using Lapua 115gr FMJ projectiles.

    I have shot about 2000 rounds of it through 3 of my guns with no problems, so my aim is to replicate that reloaded round by using

    a) the same brass
    b) the same projectile

    So all things being equal if I obtain the same powder brand and confirm the powder charge weight with the reloader then by aiming for identical OAL I should have the same ammo that I know works safe and well ?

    Will be dragging the calipers out again tonight.
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  14. #13
    Member Array Ghuqu2's Avatar
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    Contacted Hodgdon about AP70N and it is Universal Clays. I hadn't noticed your location until the guy at Hodgdon freaked and wanted to know where you got it. But all load data for Universal Clays can be used.

    Lee manual:115gr fmj - use same For 115gr GDHP (Hodgdon manual)
    start : 4.5gr
    max: 5gr
    oal: 1.125

    Hodgdon manual: 115gr LRN
    start: 4gr
    max: 5gr
    oal: 1.100
    "The millions of people, armed in the holy cause of liberty, and in such a country as that which we possess, are invincible by any force which our enemy can send against us." Patrick Henry 1775

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  15. #14
    Member Array heylin's Avatar
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    My test round came out at 1.14 OAL, ive also loaded at 4.3-4.4gr starting. Does this all sound OK ?

    My Lee Perfect powder is quite consistant did 5 lots of 10 test loads and all averaged at 4.3 - 4.4 gr

    My 10 test rounds I loaded at 4.3gr weighed individually.
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  16. #15
    Senior Member Array boscobeans's Avatar
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    Sounds good to me.. Let us know how your test rounds work out.

    bosco

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