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bam4k
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Posted: September 05 2006 at 12:01pm | IP Logged Quote bam4k

I was wondering if anyone had any pet loads for the .458 win mag using a 300-350gr bullet at 45-70 velocities. Thanks for any input.


Has anyone tried Trail Boss in the 458 win mag yet??

Edited by bam4k on September 05 2006 at 1:22pm
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Paul5388
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Posted: September 05 2006 at 7:47pm | IP Logged Quote Paul5388

Bam,

I don't actually know a reduced load for the .458, but I would be willing to say 25.0 gr of Blue Dot will be a pleasure to shoot with a 300 gr Rem JHP. 23.5 gr in a .45-70 with that bullet will produce 1640 fps, but the .458 is .4" longer and will produce less velocity with a .45-70 load.

If you fill your case completely full to the mouth with Blue Dot and strike it level with a straight edge, that would be the weight to base your calculations on. Take 40% of that weight and that will give you a starting weight. It doesn't hurt to go lighter with the load, but make sure the bullet exits the barrel!

I wasn't very clear with those suggestions. It's 40% of the powder weight without the case.

Edited by Paul5388 on September 05 2006 at 7:49pm
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bam4k
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Posted: September 06 2006 at 10:04am | IP Logged Quote bam4k

Thanks for the help, I am hoping to find someone who has tried a load with good results.
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Paul5388
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Posted: September 06 2006 at 11:12am | IP Logged Quote Paul5388

Bam,

Just about every Blue Dot reduced load I have tried has shot close to 1" at 100 yards, including the .45-70. I usually consider that to be pretty good results.
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bam4k
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Posted: September 07 2006 at 2:49pm | IP Logged Quote bam4k

I tried 25.0gr of Blue do at the Range this morning. It shot well and was grouping under 2" @ 50 yards with open sights. Next time i will bring my chrony with me and see what velocity they are at.


Thanks for your help in this matter.
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Paul5388
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Posted: September 07 2006 at 6:50pm | IP Logged Quote Paul5388

Blue Dot gives some pretty amazing results and recoil is very mild compared to most loads. IMO it's a winner for situations like this!   
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blackhawk44
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Posted: September 08 2006 at 10:21am | IP Logged Quote blackhawk44

Not really a reduced load but a lighter recoil deer load from Ken Water's Pet Loads, 72gr of RL7 behind the 350gr Hornady. Very good accuracy in two rifles.

Edited by blackhawk44 on September 08 2006 at 2:12pm
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bam4k
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Posted: September 08 2006 at 12:09pm | IP Logged Quote bam4k

Thanks for the input blackhawk44, but that is not really a reduced load. According to the hornady load book that puts the 350gr bullet at about 2400fps. I'll try it sometime though for accuracy.
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bam4k
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Posted: September 08 2006 at 12:37pm | IP Logged Quote bam4k

I called IMR and got load data for Trail Boss in the 458 Win Mag. They are:

300gr
Start: 19gr
Max: 23gr
Vel: 1282fps

385gr
Start: 16gr
Max: 19gr
Vel: 1123fps

405gr
Start: 18gr
Max: 21gr
Vel: 1082fps

485gr
Start: 13gr
Max: 19gr
Vel: 962fps

Of course these are all lead bullets, and anyone wanting to try this data should confirm it with IMR. I will try some of these loads out and post my results.




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Paul5388
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Posted: September 08 2006 at 3:04pm | IP Logged Quote Paul5388

Bam,

It would be interseting to see if those TB loads are any better than Blue Dot loads. They certainly should be closer to a full case of powder.
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bam4k
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Posted: September 09 2006 at 8:54pm | IP Logged Quote bam4k

I tried some trail boss loads with 300gr and 405gr bullets this morning. I got slighty better groups than i did with blue dot, but it could just be me as i was shooting with open sights. The loads were a pleasure to shoot and would be good on the small deer down here in Texas.
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Paul5388
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Posted: September 09 2006 at 9:03pm | IP Logged Quote Paul5388

Bam,

Did you happen to have run those TB loads through your chrony?
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bam4k
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Posted: September 10 2006 at 7:54am | IP Logged Quote bam4k

Yes i did. They were very close to the numbers given from IMR. The 300's averaged 1293fps and the 405's 1079fps. They were shot out of a 23" ruger M77.
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