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?'s on load I'm shooting

 
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  #1  
Old 02-12-2007, 01:22 AM
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?\'s on load I\'m shooting

I'm shooting a 7mm sendero w/ the following load that works great in this rifle but I'm afraid it's a little hot and may wear my barrel out prematurely. Here's my load data: H4831sc powder 64.5 grains. SMK 168's. Rem brass. Fed 215 primers. Aproxx velocity is around 3100 fps. No high pressure signs. Barrel is noticably hotter. I let it cool down before each shot. Accuracy is excellent. Also anybody hunt w/ this bullet and what were your results. I know Shawn Carlock used the 250's in his .338 w/ excellent results but I'm unsure w/ these smaller bullets.
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Old 02-12-2007, 07:04 AM
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Re: ?\'s on load I\'m shooting

Looking at Quickload for that recipe and a 26" barrel gives just under 2900fps and almost 56000psi (which is in the safe range). According to Quickload, you'd need a 36" barrel to get 3100fps from that load. Was the velocity an estimate or shot over a chronograph?

Hope that helps.

Don
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Old 02-12-2007, 11:14 AM
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Re: ?\'s on load I\'m shooting

You've got a nice rifle with a good load. If you're letting it cool and taking the necessary precautions, shoot it like it is and enjoy. You've got a hotrod magnum caliber, so barrel life is expected to be less. When it burns out, have it rebarreled. If you want a rifle that will take 4000+ rounds, you may want to consider buying a 308.
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Old 02-12-2007, 01:45 PM
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Re: ?\'s on load I\'m shooting

I get a lot higher vel. than all the books say because of my elevation here. I am sure in Idaho, he might be seeing the same thing... I usually run 100 to 250 fps faster than what the reloading manuals say.

Like hornady info is shot in Neb. at 1300 ft or similar. I shoot at 5125 ft. at the local range.

My 168 Bergers are at 3041 avg. on 5 shot string. According to the manuals I should be around 2752... Almost 300 fps difference. 289fps to be precise.

Does anyone else see this where there at ?
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Old 02-12-2007, 02:36 PM
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Re: ?\'s on load I\'m shooting

The altitude doesn't really affect muzzle velocity, the velocity downrange is affected because of the less dense air.

What make of brass are you shooting? If you take a once fired round and weigh it, then fill it with water and weigh it, that will tell us how big it is compared to others. I use Norma brass in my 7mm and it holds 86.3gr of water, which is larger than some other brass I've used. I get less velocity and pressure signs using this brass for moderate amounts of powder than I do when using 'smaller' brass. In my experience, the smaller brass will give higher velocities with lower powder charges, but will 'top out' at a lower ultimate velocity due to the smaller ultimate volume. I notice high pressure signs at a lower powder charge with 'smaller' brass.

Hope that helps,
Don
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Old 02-12-2007, 02:38 PM
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Re: ?\'s on load I\'m shooting

I have the same rifle but am shooting Berger VLD 168s. I have had the best luck with RL19 so far (3000 fps actual). Both RL25 and RL22 seemed to "top out" early. I am also testing RETUMBO as soon as the weather gives me a break. I have read some really good reviews for the RETUMBO with 7mm Rem. Great rifle!
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Old 02-12-2007, 02:51 PM
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Re: ?\'s on load I\'m shooting

I shot the 168g VLD comfortably at 2950fps out of a 24" bbl and 63g RL-22 using Rem brass. I ran it up to 3050fps, but accuracy wasn't any better. Of course, these velocitys are over a CHRONY, I dont know how well I trust it anymore....

I have played a tiny bit with RETUMBO and 162g AMAX. I started at 70g and went to 73.5g. Velocity was 3000fps on the low end (70g) and 3175fps on the high end (73.5g) Accuracy at 100 yards was rought 3/4" for all 3 loads tested. Again, velocitys over a CRHONY so I take it for what its worth anymore. I can tell you though that the 73.5g at 3175fps was MAX in my rifle.
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