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.257 Roberts help?

Robtattoo

Robtattoo

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I'm about at my wit's end with this damn Kimber.
I was really wanting to shoot 100gn bullets, but it looks like that isn't in the cards. I've tried Partitions, Core-lokt & SGKs. I know there are others, but these 3 were what I wanted to work up for (pigs & bigger, range time & whitetail)
I've tried so many combinations around the 'magic' load with IMR4350 is not even funny. Nothing from 43 to 47gn will shoot under 3" whatsoever. I've dropped below book minimum to way above & nothing seems to do better than 3". I thought I'd found a happier spot at 46, but my last range trip slapped them all into 3" again.
I'm not seeing any group shift, all group centers are consistent (it's not the scope or mounts) it just doesn't seem to want to shoot 100 grainers.
Doing a bunch of online snooping, it turns out that this seems to be common, even with the 1:10 twist. They seem to like <90gn and >110gn. The mid weights don't get any love.

So. Has anyone had any success at all with 100gn bullets in the Bob? If not, what's the consensus on 80gn TTSX on accuracy & game? I've read a ton of very positive accuracy reports on the Barnes/4350 combo, but no dead stuff reports
 
115 Nosler Ballistic Tip or 120 Nosler Partition from my 20" Ruger Ultralite with a bunch of H4831 for fuel


mine didn't care for 4350
 
I think I saved a target, from long time ago. Remington Classic in 257 Roberts. Will be back.

Found it, and was with 100 grain. Only been 30 years ago..lol
 

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I would try a heavier bullet in the 110 to 120 range. The Hornady SST is very accurate in my 25-06. I know it is a different cartridge but the same caliber
 
Robtattoo said:
I just found 50 flat based, 100gn Speers & 2 boxes of 120 boat trail Speers I'm going to try.
I've had a rifle in the past that just flat out hated anything with a boat tail....
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I assume you've gone over the rifle, crown, scope action screws etc.
I have three Bobs and they all shoot. Kimber is a 1:10 twist, right? I'll dig through and see if I've got something different worked up, did you try 100g Ballistic Tips? also have a bunch of assorted 25 cal bullets from 75 to 120 grains let me know if there's something specific you can't find.
 

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Bunt said:
I assume you've gone over the rifle, crown, scope action screws etc.
I have three Bobs and they all shoot. Kimber is a 1:10 twist, right? I'll dig through and see if I've got something different worked up, did you try 100g Ballistic Tips? also have a bunch of assorted 25 cal bullets from 75 to 120 grains let me know if there's something specific you can't find.
Click to expand...
I sold the rifle in April. I got sick to death of fiddling with it & passed it on with full disclosure. The guy who bought it had the exact same issues, sent it back to Kimber & they told him it was 'within spec'. He ended up, IIRC shortening the front action screw & doing something with the mag & got it hitting around 0.5" groups.
 
IMR 4831 120gr Partitions if you can find em havent beat them on accuracy in 3 Bob's. 2 Win n 1 Ruger.. Kinda wish still had that one.
 

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