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Old November 2nd, 2017, 01:28 PM #31
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Quote:
Originally Posted by BryanR View Post
Do you think the Leatherhead 220grn woulb be good to start with ? I think they are coated and some people had an issue with the coating shaving of a little.
I have been very happy with Leatherhead 220gr for plinking rounds for subsonic .300 Blackout.
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Old November 2nd, 2017, 02:17 PM #32
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Quote:
Originally Posted by squaregrouper View Post
I have been very happy with Leatherhead 220gr for plinking rounds for subsonic .300 Blackout.
I did order the leatherheads 220 yesterday. Right now I am just waiting for all my pieces to be delivered.

Only thing left is the primers which I will just get at Cabela's.
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Old November 2nd, 2017, 09:04 PM #33
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Quote:
Originally Posted by K31 View Post
What floating firing pin and what need of milspec primers? The OPs shooting a bolt gun!
I am assuming you are referring to my post, since I think I was the only one, other than the OP, that mentioned a floating firing pin.

Please, allow me to highlight a few sections of my entire post...
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I would go with standard small rifle primers to start with. I have had no issues with them and I shoot em out of an AR, where the mil spec primers would theoretically be more appropriate, due to the floating firing pin. You don't have a floating firing pin in a bolt gun, so you don't need mil-spec. I haven't had to go magnum or ever tried small pistol in the 300, the std primers always worked fine for me with both subsonic and supersonic.
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Old November 2nd, 2017, 09:09 PM #34
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I also agree with those in regards to cast boolits, coated or not, and using an expander to bell the case mouths, which one normally doesn't do for rifle using standard jacketed projectiles.

There is another option to the M-die or standard Lee expander... that is to get the standard Lee expander and use NOE expanders in place of the Lee version. This is what I do so I can use one cheap die and a handful of expanders to exactly form the case mouth to the different calibers of casts that I make and shoot. That setup works very well for me.
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Old November 2nd, 2017, 10:10 PM #35
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...There is another option to the M-die or standard Lee expander... that is to get the standard Lee expander and use NOE expanders in place of the Lee version...
Thanks for that tip. I'll look into it.
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Old November 7th, 2017, 08:25 PM #36
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First Dummy Round

Went through the process and everything seems to be fine. Before crimping, the round hung a little in the Sheridan Gauge. With the tiniest amount of crimp it went in easily.

Which brings me to the question...how much crimp? Just enough to get it in the gauge easily, or more ?
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Old November 7th, 2017, 08:47 PM #37
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First Dummy Round

Went through the process and everything seems to be fine. Before crimping, the round hung a little in the Sheridan Gauge. With the tiniest amount of crimp it went in easily.

Which brings me to the question...how much crimp? Just enough to get it in the gauge easily, or more ?
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Old December 7th, 2017, 12:57 PM #38
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Chronograph results

Here are my results from a recent range trip.

I used the 1680 and small rifle primers.

It looks like 10.0 grains is about right.....unless I am missing something.

Also, as this is my 1st time.... are there anything from these numbers that are out of parameter's or looks like it needs correcting?

Is this much deviation and spread normal ?

Thanks....Bryan



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Old December 7th, 2017, 01:20 PM #39
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How'd they group for you?

I'm about to try out the Berry's 220 gr plated, but my go to are the King Shooter's Supply PC
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Old December 7th, 2017, 01:33 PM #40
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I only was concerned about the speed and didn't really check the accuracy other than to eyeball the target when I was done. Also, my target was only about 40 yards away. Generally, all shots were pretty close together at that range, and I shot 10 different powder loadings. After 50 rounds there was a hole about the size of a 50 cent piece and scattered out to about pie plate diameter. I was not really aiming for accuracy as much as I was trying not to kill my chrono.

Next I will probly take 9.9, 10.0 and 10.1 and shoot more rounds of each to check for accuracy or see if it makes a difference.

Also, I weighed each LEATHERHEAD bullet and they where all between 224.4 and 226.8 and one at 228.2
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