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300 win mag in Browning rifle

 
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  #8  
Old 03-31-2009, 05:05 PM
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Re: 300 win mag in Browning rifle

I've been experimenting with the 200gr. AB, RL25, Fed. 215, Norma brass. The results have have been pretty good, but not spectacular. I made up test loads ranging from 74gr. to 78gr. . 75gr. shot the best at 3/4" and the rest were right around 1 1/4". Velocity went from 2600 for 74gr. and 2770 for 78gr.

No pressure signs were evident, even at the very top with 78 gr. I'm gonna try a few more with higher powder charges. I almost wonder if RL25 is a little on the slow side for the 300 Win Mag. The rifle shoots consistently with it, but I feel I could get a bit more velocity with RL22. But, I'm not going to cry over 100 fps. Hopefully I can get it to group tighter yet with heavier charges.


I need to go out to my garage now to finish building the steel gongs I've been working on so I can practice farther than 300 yds. Eric
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  #9  
Old 03-31-2009, 09:21 PM
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Re: 300 win mag in Browning rifle

Hey eric

The low velocity is a function of the short mag and not being able to load close to the lands. IME the 200 gr Accubond shoots well at close to 2900 fps but that could vary with each gun.

Going to a faster powder like RL22 may be actually going the wrong way if you are looking for velocity. The more of a slow powder you can stuff in the case the more velocity you will get. H1000 or IMR7828 are a little faster than RL25 but a lot slower than RL22 so you may find something your gun likes there.

Also since you have a big jump you might try the 180 gr TTSX since it likes a large jump to the lands and you will get better velocity than the 200 gr. TTSX's or the regular TSX can be very accurate bullets.
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  #10  
Old 03-31-2009, 10:58 PM
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Re: 300 win mag in Browning rifle

Quote:
Originally Posted by woods View Post
Hey eric

The low velocity is a function of the short mag and not being able to load close to the lands. IME the 200 gr Accubond shoots well at close to 2900 fps but that could vary with each gun.

Going to a faster powder like RL22 may be actually going the wrong way if you are looking for velocity. The more of a slow powder you can stuff in the case the more velocity you will get. H1000 or IMR7828 are a little faster than RL25 but a lot slower than RL22 so you may find something your gun likes there.

I understand all of this. I have alot of freebore, lowering pressure, and velocity.
I loaded up some more just now. They went from 78.5 to 80.5gr of RL25. The 80.5 is getting compressed, but not too bad yet. I've already been to 78gr. so I'll start at 78.5 and go up. How high have you loaded the 200gr. AB with RL25. I'm gonna go up in charge weight until the case is too full to properly seat a bullet, or I see any sort of high pressure signs. So far the Norma brass I'm using is doing well. I would really like to get up to 2900 or so. I do know that every rifle is different, I'm just curious how high you've loaded it to. Thanks for your help Woods.
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  #11  
Old 03-31-2009, 11:55 PM
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Re: 300 win mag in Browning rifle

The most I have loaded with RL25 and the 200 gr Accubond is 77 gr. That is loading close to the lands.

Please be careful and look for pressure signs cause you are over book max.
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  #12  
Old 04-01-2009, 12:03 AM
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Re: 300 win mag in Browning rifle

I will be cautious. I'll keep my OAL the same and watch carefully for trouble. I'll report back when I make it to the range. Eric
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  #13  
Old 04-01-2009, 09:11 AM
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Re: 300 win mag in Browning rifle

In my Browning a-Bolt I had the same issue with the magazine as well. I also modified the box magazine as you did. Using a 190gr Berger VLD I am able to get to a COAL of 3.530. The load I am using is Win Brass H 4831sc 74.5gr Fed GM 215M primers. 2970 fps MV. My average group size is .5" at 100 yds.
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  #14  
Old 04-02-2009, 05:49 PM
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Re: 300 win mag in Browning rifle

Well, I shot the new batch of test loads today. 79gr. gave me a group of 0.8" and 2800fps. I'm pretty happy with that, but would still like to get up to 2900. 79.5gr. had a group of 1.2" and a speed of 2810fps. 80.5gr had groups of 3.25" and a velocity of 2840fps. They really opened up. I would say that 79gr. of RL25 is the sweet spot with this combo. I may just stick with it. I see no need to go higher in charge weight than what I already have, as groups are opening up and velocity is jumping quicker than before. I noticed no signs of pressure on my brass, but I see this as a max.

I may try a few with IMR 7828 to see what the results are.
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