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Reloading 300WinMag Questions ???

 
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  #1  
Old 11-20-2010, 02:36 AM
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Reloading 300WinMag Questions ???

Hello people.....i have been searching for this info but in the last 3 hrs haven't come up with enough to start my reloading Debut.......i have recently aquired all my gear for reloading and instead of practicing what the manuals say i thought i'd ask some of You experts.......I have a Sendero SFII .300Win Mag and have been using Remington ACCUTIPS till now......with my "Once Fired" Rem brass i have bought the following which was ideas from you guys.....

* H-1000 powder (AR2217)
* CCI250 Mag Primers
* Berger VLD 190gr proj.
* SMK 190gr Proj.

I have measured a case with a Projectile "Loosely" fitted to the rifling and have come with an OAL of 3.595"

Firstly, with my once fired brass, What length should they be trimmed to ?
Secondly, what powder ranges should i load From and To ?
Thirdly, Should i load both types of projectiles the same in order to find which one the Remmo likes best ?
Finally, what is the best distance off the lands or rifling to start my test loads ??

All data gathered will be posted up to help others in the same boat.

Thanx for any help in this, I think this is an Awesome site for info !!
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Old 11-20-2010, 09:03 AM
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Re: Reloading 300WinMag Questions ???

I have not used the 190 Bergers in a 300 win. But I have used the 210's a lot. So you can probably use my data for a starting load. I would start around 72 gr of H-1000 and .040" off the lands. From this I would pic a bullet and work up the powder charge to where I find the best accuracy. Once this is achieved I would then move to .030" off the lands and also some .050" off the lands to get a direction on what your rifle likes with the chosen bullet. Once you have a direction go with it until the groups open up or acceptable accuracy is obtained.

I trim to the book (reloading manual) length.

Jeff
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Old 11-20-2010, 10:50 AM
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Re: Reloading 300WinMag Questions ???

I'm using the 185 VLD
81g H1000
CCI BR2 primers
Nosler brass

Trim to length the manual says. Start with a safe load 81g H1000 is max in most books. You need to also read the Erics essay on the home page loading for VLD bullets. He suggest a 24 round seating depth test. It is what I used to get my load.
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Old 11-20-2010, 04:04 PM
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Re: Reloading 300WinMag Questions ???

You should go to the Hodgdon Data website for load data.

For your first loads why not use the recommended COL from the bullet manufacturer? My first-ever handloads were for a 300 Win Mag. Quite a pucker factor first time pulling the trigger. I ended up using Retumbo, it was more accurate and repeatable than H-1000.
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Old 11-21-2010, 12:28 AM
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Re: Reloading 300WinMag Questions ???

Quote:
Originally Posted by ICANHITHIMMAN View Post
I'm using the 185 VLD
81g H1000
CCI BR2 primers
Nosler brass

Trim to length the manual says. Start with a safe load 81g H1000 is max in most books. You need to also read the Erics essay on the home page loading for VLD bullets. He suggest a 24 round seating depth test. It is what I used to get my load.
81gr ?? Thats more than the manuals max....... wow...
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Old 11-21-2010, 12:34 AM
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Re: Reloading 300WinMag Questions ???

.25MOA,
I got good accuracy from my .300WinMag using the 190gn SMK's and H1000 w/CCI 250's. I started at 79.0 and went to 80.5gn in 1/2gn increments.

79.0gn gave the best accuracy (.142") and veloctiy averaged 3078fps, ES 7.83, SD 4.12

While shooting the 80.5gn load the chrono went bonkers for some reason, but accuracy ran .4185" (3shot).
Tried 80.5gn again four days later and velocity averaged 3145fps and accuracy was .5245" - 5shot group.
I was pleased with this load's (80.5gn) performance and it would only get better by adding a 190Berger to it. This was my first experience with H1000. Needless to say, I will be buying more!
JohnnyK.
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  #7  
Old 11-21-2010, 02:56 AM
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Re: Reloading 300WinMag Questions ???

Quote:
Originally Posted by johnnyk View Post
.25MOA,
I got good accuracy from my .300WinMag using the 190gn SMK's and H1000 w/CCI 250's. I started at 79.0 and went to 80.5gn in 1/2gn increments.

79.0gn gave the best accuracy (.142") and veloctiy averaged 3078fps, ES 7.83, SD 4.12

While shooting the 80.5gn load the chrono went bonkers for some reason, but accuracy ran .4185" (3shot).
Tried 80.5gn again four days later and velocity averaged 3145fps and accuracy was .5245" - 5shot group.
I was pleased with this load's (80.5gn) performance and it would only get better by adding a 190Berger to it. This was my first experience with H1000. Needless to say, I will be buying more!
JohnnyK.
Thanx Johnny.......isn't that a pretty Hot load, my manual says 79gr Max.......what is your rifle ???

I have 2 reloading manuals, neither list the 190gn proj. One of the manuals states a Max load of 81gr for the 180gr and 77gr for the 200gr, the other manual states 79gr for the 180gr and 77gr for the 200gr......confused.... although one manual is using H-1000 and the other AR2217
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Last edited by .25MOA; 11-21-2010 at 03:16 AM.
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