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N320/clays- zero 165gr minor data


motosapiens

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I notice there's not much 165 gr data out there, and lots of 180 gr data, but my supplier was out of 180's and had lots of 165's so I got some last year, and have stuck with them since I can't feel any difference anyway (my wife says i'm insensitive).

anyway, just got a chrono finally, so I provide the following data to my reloading brothers free of charge. Hopefully someone will find it as useful as I find so much stuff on this forum.

I'm impressed with the consistency of the pro-autodisk powder measure. Single-digit standard deviation on 2 out of 3 loads today (plus my 9mm load was even tighter). I only wish the gaps weren't so big between sizes, but that's what sandpaper is for. As you can see, i'm pretty much there on the minor loads (but going to do a little sanding to get about .1 gr more for safety's sake), and still have a little work to do on the major load. I'm pretty conservative, so I'm thinking of trying n340 for major since I won't be right at the published max load then (n320 max is 5.2gr at 1.126 oal for 165gr bullet according to VV).

These are all shot out of a cz75b. I forget the barrel length, but y'all have google.

Feb 2012 .40

4.2 gr n320 (.53 autodisc)

165 gr zero jacketed

1.130 oal

wsp

avg velocity 854

140 pf

Feb 2012 .40

4.0 gr n320 (.49 autodisc)

165 gr zero jacketed

1.130 oal

wsp

2/7/12 chrono avg 763, sd 8, pf 125.9 :o

Feb 2012 .40

5.0 gr n320 (.61 autodisc)

165 gr zero jhp

1.125 oal

wsp

2/7/12 chrono avg 984, sd 7, pf 162 (need to try 5.1)

Feb 2012 .40

3.2 gr clays (.49 autodisc)

165 gr zero tc

1.125 oal

wsp

2/7/12 chrono avg 770, sd 14 pf 127

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Hey motosapiens,

Do you have any load and chrono data for your N340 / 165 grain load?

From a feel perspective, did you notice more lift / vertical recoil with ( a ) your N320 / 180 gr load or ( b ) your N340 / 165 gr load?

I'm thinking of switching from my current N320 / 180 grain load to N340 / 165, for the same reason (i.e., seems easier/safer to get to major without maxing out loading specs).

Thanks.

Edited by SirLoin
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Hey motosapiens,

Do you have any load and chrono data for your N340 / 165 grain load?

From a feel perspective, did you notice more lift / vertical recoil with ( a ) your N320 / 180 gr load or ( b ) your N340 / 165 gr load?

I'm thinking of switching from my current N320 / 180 grain load to N340 / 165, for the same reason (i.e., seems easier/safer to get to major without maxing out loading specs).

Mr Loin, Sir, I never ended up trying the n340. After shooting a few hundred rounds and carefully examining the brass, I concluded that VV's manual is probably even more conservative than I am, and the 5.1-5.2 of N320 shows no signs of pressure whatsoever.Primers are very slightly flatter than the ones from my minor loads, but there is no appreciable difference in the brass. The difference between my major load primers/brass and the primers/brass from factory SD loads is quite dramatic, and so is the recoil, so I concluded that n320 is probably very safe, even for me.

Note also that I haven't shot any 180's. I thought about it since czcustom has 180's but no 165's, but i mostly shoot minor anyway, and I'd rather go with a little lighter bullet for minor to keep the velocity up.

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