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working on 215 Vlds 300 ultra

 
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  #15  
Old 12-30-2012, 10:59 PM
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Re: working on 215 Vlds 300 ultra

Quote:
Originally Posted by Lefty7mmstw View Post
rl33 is just fine, rl50 is rather compressed by 2900 fps and 98 grains, by 3000 fps and 102 grains it is damn compressed but it still holds length(when left to sit for a spell) and shoots as well as 98 grains. I'm switching to rl33 for the heavies on it if they chrono well. Even at 3K fps rl50 is a rather mild load with the 225 in the rum. I hope rl 33 is faster as it seemed snappier when I shot them side x side. The wind was up too much last fall when I went out with the rum and rl33 to chrono it. I don't want to buy another chrono stand.
When Matthews built my RUM, I don't think 33 and 50 was available yet, at least I don't remember them. The slowest I did try was 50 BMG, a new powder, but could only squeeze about 102grns in the case if I remember right. My rifle didn't like Retumbo. I would like to try 33, may give a little more volume. Thanks for the ifo.
db
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  #16  
Old 12-30-2012, 11:18 PM
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Re: working on 215 Vlds 300 ultra

I finally found some info on how rl33 shot in my 30 rum last fall -- I couldn't find the targets but had been active on the rl33 thread for a spell.


90 rl33 produced a 1.080" 100 yard group with mild pressure
93 rl33 produced a 1.035" 100 yard group with slightly warmer pressure
95 rl33 produced a 0.675" 100 yard group with about max pressure
This is with the 225 hdy hpbt and rem brass lit with a 215. Groups were shot on a rather windy day at 100 yards.
I want to get it out again soon to verify cold weather accuracy before I lock in the top charge when hot weather hits.
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  #17  
Old 12-30-2012, 11:33 PM
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Re: working on 215 Vlds 300 ultra

How many reloads before you before your primer pockets go south?
db
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  #18  
Old 12-31-2012, 08:39 AM
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Re: working on 215 Vlds 300 ultra

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Originally Posted by dbhostler View Post
How many reloads before you before your primer pockets go south?
db
I don't loose primer pockets... I am still shooting necked up brass from my 7 rum( I retired that rifle 5 years ago when the throat went). I FL all my brass with headspace set for the action to just close well and invariably have neck cracks take the brass. The only pockets I've lost on rum brass were a couple with the 7rum pushing 8700 to top rated loads; that powder leaves a lot to be desired.
I refuse to push a rifle past normal working conditions for a few more fps; it's just too hard on things. If it can't be done with my toy and I deem it needs to be done, I'll get a bigger toy.
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  #19  
Old 12-31-2012, 09:01 AM
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Re: working on 215 Vlds 300 ultra

Do you aneal your brass?
db
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  #20  
Old 12-31-2012, 11:00 AM
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Re: working on 215 Vlds 300 ultra

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Originally Posted by dbhostler View Post
Do you aneal your brass?
db
No, but I may need to think about it in some cases. I had some virgin 7rums and made them into 30's off the bat and by firing two or three they were showing some losses from cracking. I'm migrating over to real 30 rum brass from re-forms but still have 100 or so reforms getting shot up. I don't get out enough with the rum lately as a few of the other rifles are still vying for my time. I also shoot the 180 and 190 hornady in the 300 rum so I've got established 1/2 moa loads without the 225. I do believe the 225 will net better results when you get past 500 yards or so and will pursue a good load for the bullet;I think I'm very close already.
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  #21  
Old 12-31-2012, 12:09 PM
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Re: working on 215 Vlds 300 ultra

What powder do you use for the lighter bullets?
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