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300 RUM load development questions

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  #71  
Unread 03-15-2013, 07:25 AM
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Re: 300 RUM load development questions

Cerwin, did you mention in an earlier post your were sizing cases to have a snug fit in the chamber when the bolt closed? And that the case necks were size almost to the shoulder but left a small ridge next to the shoulder?

If not, the please forgive my asking; it then had to be someone else.
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  •   #72  
    Unread 03-15-2013, 07:37 AM
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    Re: 300 RUM load development questions

    Quote:
    Originally Posted by cerwin View Post
    Did you switch to different brass?:
    Yes Sir, I wnt back to Rmington Brass. Dont get me wrong I loved the Nosler custom because it came preped and ready to go but after you have fired them then you are kind of back to home plate. What happened im my case was everyone on LRH was saying how they could load close to max and was getting a high MV , so I decided to try and find my accuracey node on the high side of the load chart but I could never make it because I would get rough ejector marks and very tight boat lift . Almost so tight that I could barely eject a spent brass with my hands. I was told by a pretty competant shooter from this site that the Nosler Brass is softer than the remington and thats why I had these Issues . So I switched and never had this problem thus far . Maybe I had a soft batch . But I started noticing that the guys loading on the high side was using remington brass . I kind of always wondered why Carlock didnt use it in his Edge

    Are you loaing on the high side ? And are they working fine for you ?
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      #73  
    Unread 03-15-2013, 07:38 AM
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    Re: 300 RUM load development questions

    Quote:
    Originally Posted by Bart B View Post
    Cerwin, did you mention in an earlier post your were sizing cases to have a snug fit in the chamber when the bolt closed? And that the case necks were size almost to the shoulder but left a small ridge next to the shoulder?

    If not, the please forgive my asking; it then had to be someone else.
    I think Rifleman said that earlier in this thread, but that is basically what I'm doing
    Bart, I responded to reply from you on another thread I'd started. I'm interested in your thoughts on it
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      #74  
    Unread 03-15-2013, 10:38 AM
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    Re: 300 RUM load development questions

    Quote:
    Originally Posted by bigbuck View Post
    Yes Sir, I wnt back to Rmington Brass. Dont get me wrong I loved the Nosler custom because it came preped and ready to go but after you have fired them then you are kind of back to home plate. What happened im my case was everyone on LRH was saying how they could load close to max and was getting a high MV , so I decided to try and find my accuracey node on the high side of the load chart but I could never make it because I would get rough ejector marks and very tight boat lift . Almost so tight that I could barely eject a spent brass with my hands. I was told by a pretty competant shooter from this site that the Nosler Brass is softer than the remington and thats why I had these Issues . So I switched and never had this problem thus far . Maybe I had a soft batch . But I started noticing that the guys loading on the high side was using remington brass . I kind of always wondered why Carlock didnt use it in his Edge

    Are you loaing on the high side ? And are they working fine for you ?
    I have noticed that Nosler brass tends to be a little soft in comparison. Thanks for the tip. I have just started with a moderate charge 88 gr Retumbo. Have not pushed it up higher yet. Hopefully this weekend I'll be bumping it up, and see what happens

    Last edited by cerwin; 03-15-2013 at 10:43 AM. Reason: added text
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      #75  
    Unread 03-15-2013, 12:41 PM
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    Re: 300 RUM load development questions

    Cerwin, best accuracy with arms and ammo only happens when everything is as repeatable as humans can make it. This includes the bolt closing and locking up in exactly the same place for every shot. If there's any binding when the bolt's closed on a round with a "snug" fit in the chamber, the bolt won't be in the same place every time this happens. When the round fires, any strain, however slight, on the barreled action effects how it wiggles when fired.

    Benchresters neck only sizing would notice this after a case had been neck sized 4 or 5 times; sometimes less. So they sized such cases with dies that set the shoulder back so there's at least a couple thousandths extra room length wise for the round to chamber without the bolt binding.

    Therefore, I suggest you do something to ensure your fired case shoulders are set back at least .001" when sized. Here's a link to something very handy for making very accurate changes in sizing die height:

    http://thefiringline.com/forums/atta...2&d=1259689721

    Was that ridge on the neck at the shoulder junction intended to better center the case neck in the chamber neck?
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      #76  
    Unread 03-15-2013, 01:09 PM
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    Re: 300 RUM load development questions

    Quote:
    Quote:
    Originally Posted by Bart B View Post
    Cerwin, best accuracy with arms and ammo only happens when everything is as repeatable as humans can make it. This includes the bolt closing and locking up in exactly the same place for every shot. If there's any binding when the bolt's closed on a round with a "snug" fit in the chamber, the bolt won't be in the same place every time this happens. When the round fires, any strain, however slight, on the barreled action effects how it wiggles when fired.

    Benchresters neck only sizing would notice this after a case had been neck sized 4 or 5 times; sometimes less. So they sized such cases with dies that set the shoulder back so there's at least a couple thousandths extra room length wise for the round to chamber without the bolt binding.

    Therefore, I suggest you do something to ensure your fired case shoulders are set back at least .001" when sized. Here's a link to something very handy for making very accurate changes in sizing die height:

    The Firing Line Forums

    Was that ridge on the neck at the shoulder junction intended to better center the case neck in the chamber neck?
    Yes, that's the intension and it seemed to work well enough in my 300 RUM, also know another guy who does it in his 300 WSM with good success.

    It could be another one of those things up for experiment.
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      #77  
    Unread 03-15-2013, 02:12 PM
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    Re: 300 RUM load development questions

    Regarding a ridge on a case neck to better center it in the chamber neck......
    Quote:
    Originally Posted by MontanaRifleman View Post
    Yes, that's the intension and it seemed to work well enough in my 300 RUM, also know another guy who does it in his 300 WSM with good success. It could be another one of those things up for experiment.
    A case neck fully sized back to the shoulder will never touch a chamber neck when the round's chambered and fired. As long as the case neck's well centered on the case neck, it'll float free of contact in the chamber neck as the case shoulder's pressed hard into and well centered in the chamber shoulder.

    Full length sizing case necks all the way to the shoulder bumping the shoulder back a thousandths better centers the case neck on its shoulder anyway.
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