| Posted: Thu Oct 1st, 2009 08:40 PM |
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ar15fanboy
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I am going to use some 7.62 cases from HSM M118LR equivalent rounds. I think HSM use Winchester brass. I am going to use varget as my powder and going to start from 42.0 grain and work my way up. I was wondering if anyone used the same components and know if I can get upto 46 grains in 7.62x51 cases. Thanks.
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| Posted: Thu Oct 1st, 2009 08:55 PM |
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smacks
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One of my manuals is showing 47.0 grains as the never exceed load, compressed.
I have both the powder and both cases, commercial and LC brass but haven't checked to see how much difference there would be in that Number of grains In filling the NATO case.
You are approaching the never exceed load either way you go.
What I would do is start with the starting load with the NATO brass and work up one grain at the time with 4 or 5 cases at the time. When you reach the mid range level start your increase at 1/2 grain to approach the never exceed load.
Only if You know your rifle is in good condition and has a tight chamber would I try using a never exceed load.
By the way, what kind of rifle is this for? smacks
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| Posted: Thu Oct 1st, 2009 09:06 PM |
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smacks
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For got to ask. What weight bullet.
The info I gave is for 150 grain bullet. another manual gives 44.9 grains as the never exceed load.
If your starting with the starting load and don't want to compress then I don't see any problem.smacks
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| Posted: Thu Oct 1st, 2009 09:52 PM |
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ar15fanboy
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This is for a factory remington 5R. I am planning to use 168 grain bullets.
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| Posted: Thu Oct 1st, 2009 10:15 PM |
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smacks
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If the case performs in the rifle, other than factory warranty issues I don't see any problem.
That said, I do wish some others would chime in. smacks
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| Posted: Sat Oct 3rd, 2009 04:08 AM |
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Dragon88
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Bottom line up front: You are in dangerous territory. My manual shows a max charge of Varget behind a 168gr is 43.5gr. This is for a 308 case. Your 7.62x51 case will have reduced capacity. Even 42gr is much too high for your starting load.
Most manuals recommend to back off 1-2 gr for military brass. I tried 1.5 under a couple weeks ago and the load was still hotter than I wanted, using LC brass. Please check your load data again for suggested starting and max loads and reduce those figures by 2 grains in 7.62x51 brass.
Be safe.
Dan
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| Posted: Sat Oct 3rd, 2009 04:34 AM |
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fryboy
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dragon pretty much nailed it ...mil-surp brass is indeed thicker , heavier with a reduced capacity ,add to that any decent reloading manual will state to reduce or consider max load 1-2+ grains below posted max loads for .223,.308,30-06 etc etc or many wildcats formed from such cases , again as they state " any time u change a component u should reduce ur loads and work back safely up " ,i love using 375 winchester brass for many cartridges formed from the humble 30-30 ...same outside dimensions but ...the case is much thicker and stronger reducing my powder capacity and when that happens pressure builds up faster and higher ,hornady has different loading data for the 308 vs. the 7.62x51
keep n mind that they use their own brass for both ( ie; identical) and both had a 22" barrel both used standard primers ( the 308 federals , the 7.62 winchester)
.308 165-168 gr. bullet, powder varget
start 32.6 fps 2100
max 44 fps 2600
7.62 168 gr. bullet, powder varget
start 35.6 fps 2100
max 42.7 fps 2600
both max loads should be worked up to as one can find that a gun's max load is below published max loads ( and once in a great while it can be higher)the max loads above were obtained in a controlled lab( a very good a nice lab at that -i'm so jealous !! )
in a 7.62 nato case i would consider 40.7 max (recall hornady used .308 cases instead of mil spec cases which are thicker) until u work up and only then would i consider a larger charge if pressure and velocities are safe ,while there is lots of cases ,bullets and powder we only have one of u , be safe amigo !
edit for add...
keep in mind that quite often boat tail bullets set deeper also decreasing powder space( double ditto for the copper bullets )
____________________
(happy shootin'-the best way to get empty brass!)
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