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Fireforming the 6.5 Gibbs

 
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  #1  
Old 10-14-2007, 07:22 PM
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Fireforming the 6.5 Gibbs

what fireform loads do y'all use? I blew another primer today and got a face full of powder residue, this makes 2 just fireforming. The first one broke the extractor.
I'm using the reccomended load from the guy who built the action,
(necked for a crush fit, 54 gr H-4831/140 gr bullet)
I tried a batch with cornmeal but the necks end up thicker with that method.
Is there a way I can tell if I'm under pressure or over?
would mid-level 6.5/06 loads be ok to fireform with? anybody got any ideas?
RR
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  #2  
Old 10-14-2007, 07:40 PM
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Now I'm really confused, hodgdon's data for the 6.5/06 with a 140 and H-4831 says 49.5 max load
But for the 270 win and 140 gr/H-4831 it lists 58.0C as a max load
RR
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Old 10-14-2007, 09:17 PM
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Hello: To start with I use 142 gr. SMK for fireforming and regular loads and both at COL = 3.445". The first time I had used 54.0 gr. H4831SC to fireform my 6.5 Gibbs and it was too hot. It made the primer pockets just a little bit loose. I dropped down to 52.0 gr. H4831SC for fireforming and it seems to be OK. Cases are formed good. For my regular loads I use 58.0 gr. H1000 but I hadn't check the velocity on that load. I had checked 59.0 gr. H1000 at 3,075 fps. I don't need the high end velocity and am trying to extend case life. You mentioned confusion on the lower powder loads for the 6.5-06 vs. the 270. It has something to do with the smaller diameter causing higher pressures even in the same basic case. Someone else who is smart could probably tells us why. I found out (almost the hard way) in trying to develop loads for my 6.5-300 Wby. by reasoning 300 Wby. loads and bullet weights would be the same for the 6.5-300. Well, no, it don't work that way. Real high pressure. Thankfully no damage, just a real tight bolt. Good thing I am very conservative when developing loads. By the way I really like my 6.5 Gibbs. It shoots great. Hope this helps. Sam.
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  #4  
Old 10-14-2007, 09:33 PM
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I used the 54 gr with rem and win cases, this batch is nosler, after fireforming I can get around 3250 fps with a number of powders with a 140 A-max. I got 3250 fps with 67 gr of H-1000 with no pressure signs whats-so-ever, and 60 gr of re22. mine shoots ok, it still needs a bit of work, shot a 300 yd group yesterday off a bipod with no rear bag that went 1.6", just trying to figure out how to make cases without having to neck turn. thanks for your response
RR
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Old 10-14-2007, 10:25 PM
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Ridge Runner,
I have used the 56.0 gr of H-1000 with a 140 gr bullet with good results as well as the tried and true magnum primer, 8.0gr of Unique, fill the case with cream of wheat to the neck and firmly seat some toilet paper on the top. Cases come out very good! Clean thoroughly after this method!
I do turn all my necks prior to fireforming.
Dave
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  #6  
Old 10-14-2007, 10:50 PM
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Fire forming

I recomend reduceing a standard load only 5% for fire forming

And also always seat the bullet at least 50 thousandth,s or more
Off the lands.

Check the fired brass and see if a 6.5 bullet will go in the neck, If not
necks may be to long (This will also cause over pressure with normal
loads) or to thick and need thinning down.

Try to find the problem before shooting any more rounds to prevent
injury to your self or to the bolt face.

J E CUSTOM
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  #7  
Old 10-14-2007, 10:58 PM
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Thanks dave, my cases came out ok, with the cornmeal or cow method, I used 11 gr of unique, cci 450? primer and 140's, but since I'm necking down with a fl sizer the necks were a bit uneven, and thicker when I used cow vs. a bullet, my only guess was that using a bullet pulled more brass from the neck to form the shoulder than the cow load, after fireforming I turned the necks down to .010, guess I'll go back to that method.
Thanks to all for the info
RR
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