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7mm stw problems!!

 
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  #1  
Old 12-23-2005, 09:26 PM
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7mm stw problems!!

hey everyone I have some questions about my stw. I am loading for a ruger no.1 with 26" barrel. My load consists of 160gr accubond with 80gr of H-1000 and fed 215M primers , the bullet is seated .020" from the lands. My problem is i can't touch 3200fps like I want to with this load. I am already getting flattened primers. I don't know how to measure case head expansion so I don't know about that. My velocity was around 3090fps. I have bought some RL-22 but I don't know were to start with this powder. Should I try a different primer or what here. My brass is winchester brass also if that helps. help me out here people..
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  #2  
Old 12-23-2005, 11:35 PM
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Re: 7mm stw problems!!

Exchange that can RL-22 for some RL-25. I would try IMR-7828 too.
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Old 12-23-2005, 11:48 PM
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Re: 7mm stw problems!!

I agree w/HG.

Alliant says a 160gr Aframe w/80gr of RL-25 gets you to where you want to be. A 160gr Nosler partition and 79gr RL-22 get the same published velocity. Pressures are listed as 62k

Also, flat primers are a subjective thing. You largest concern with the #1 is sticky cases. The #1 doesn't have much camming ability.

I'd kind of sneak up on a max load and watch for just a hint of stickness then back off a bit. Then you have what you have. I'd be a real bummer to need a second shot and have a stuck case.

I've tried this in my #1 375 H&H but get to too much recoil before I get anywhere near too much pressure with the 300gr bullets.
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Old 12-24-2005, 01:08 AM
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Re: 7mm stw problems!!

just curious are the alliant powders "extreme" powders like the hodgon powders? does temp effect them like some other powders? Also what primers do you recommend?
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Old 12-24-2005, 07:09 AM
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Re: 7mm stw problems!!

I had the same problem when I first began load developement for my stw, a tech from sierra said that flattened primers when using fed 215's by itself was no big deal, they have a soft cup.check for sticky extraction and case head expansion. I can achieve 3200 fps with wc872 and 160 accbds. always used 140's with the H1000.
JS
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Old 12-24-2005, 07:19 AM
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Re: 7mm stw problems!!

[ QUOTE ]
just curious are the alliant powders "extreme" powders like the hodgon powders? does temp effect them like some other powders? Also what primers do you recommend?

[/ QUOTE ]

Short answer: Nope....

Longer answer: Alliant powders are fairly temperature sensitive. For example an RL-22 270 Win load and a 140gr Hornady w/a MV of 3200 during the warm months reduces to 3070 in the winter months.

Rumor has it that RL-22 is the floor sweepings from Norma's MRP. By floor sweepings I mean a lower grade.

All powders are temp sensitive to some extent. RL-22 shoots best in all of my rifles, I just compensate the load for the season.

I also use Federal primers and don't worry much about flat primers until they start filling that small beveled ring around the primer pocket. When it gets to that point, pressures are a bit beyond what they should be.
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Old 12-24-2005, 07:55 AM
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Re: 7mm stw problems!!

[ QUOTE ]
I also use Federal primers and don't worry much about flat primers until they start filling that small beveled ring around the primer pocket. When it gets to that point, pressures are a bit beyond what they should be.

[/ QUOTE ]

I shoot a #1 in 7mm Wby and use the Fed 215M and I watch that small bevel too. When I get that I back down one notch (sometimes). Ha Ha

I would be cautious about using the 160 partition loads for the Accubond. The parttions have a softer lead core, a softer copper jacket and a shorter bearing surface. Less pressure needed to get them to go down the barrel.


What I have found in 7mm wby is as follows:
Because of the "toughness" of the AB it resists deforming when it hits the lands.

I can get maybe a 100fps (1.5 grains more of RL22)more speed out of the "softer" Hornady 162 gr SST than than the 160AB.

The AB was more accurate and I wanted the accuracy and ability to break through lots of bones more than the speed.
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