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what velocity your getting ???

 
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  #1  
Old 02-17-2014, 08:29 AM
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what velocity your getting ???

Does anyone honesty have and chronograph a 7mm mag in a 30" barrel ???

Is so what speeds are you getting ??
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Old 02-17-2014, 08:47 AM
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Re: what velocity your getting ???

What bullet weight are you talking about?

I only have #s for a 26" barrel though.
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Old 02-17-2014, 08:59 AM
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Re: what velocity your getting ???

140 ballistic tip
162 amax
168 bvld
180 bvld
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Old 02-17-2014, 09:14 AM
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Re: what velocity your getting ???

Quote:
Originally Posted by HunterGreen View Post
Does anyone honesty have and chronograph a 7mm mag in a 30" barrel ???

Is so what speeds are you getting ??
I used to shoot a 7 mag in competition that had a 29.4" barrel. I used 168gr SMKs and loaded 66.5
grains of H 4831 for 3200 ft/sec. I bumped it a little and got 3254 but in hot weather it would blow the primers (To Hot) so I would be VERY careful when you get in this neighborhood.

Also I used DWM cases because regular brass would not hold up for 2 or more shots.

I do not recommend using loads this hot and would suggest that you start low and work up until you see pressure signs and back off 1 grain. Velocity will be different in different barrels so you will just have to live with what you get.

If you are not sure about the chroney results, do a bullet drop test from 100 to 600 yards and this will verify velocity.

J E CUSTOM
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"PRESS ON"
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  #5  
Old 02-17-2014, 09:27 AM
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Join Date: Jan 2014
Location: Good ol USA
Posts: 202
Re: what velocity your getting ???

Quote:
Originally Posted by J E Custom View Post
I used to shoot a 7 mag in competition that had a 29.4" barrel. I used 168gr SMKs and loaded 66.5
grains of H 4831 for 3200 ft/sec. I bumped it a little and got 3254 but in hot weather it would blow the primers (To Hot) so I would be VERY careful when you get in this neighborhood.

Also I used DWM cases because regular brass would not hold up for 2 or more shots.

I do not recommend using loads this hot and would suggest that you start low and work up until you see pressure signs and back off 1 grain. Velocity will be different in different barrels so you will just have to live with what you get.

If you are not sure about the chroney results, do a bullet drop test from 100 to 600 yards and this will verify velocity.

J E CUSTOM
Wow thats smokin,

I have 1 month to make up my mind on barrel taper and contour.

It will @30 , I measured the stock barrel on Remy and its 1.230 at breach. Would like to have that for 7-8 inches than taper to .900
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  #6  
Old 02-17-2014, 09:41 AM
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Join Date: Dec 2005
Location: Tucson Az
Posts: 1,373
Re: what velocity your getting ???

I had one. Got up to 3085 fps with 180 Berger VLD and RL-25 with bullet firmly into rifling. Accuracy was best at 3055 fps

Later the 1 in 7 twist 3 groove caused the VLDs to diverge from POI and much to my dismay at round count 236 while shooting at a coues wt!!! ( Lesson learned about too much twist with a 3 groove)I had to borrow another rifle to finish off the wounded animal. You can imagine how happy I was at that moment. Good old Murphy's law.....

Switched to target VLDs which lasted another 75 rounds then THEY became damaged. Moly coated them and within 50 rounds THEY were damaged too! Finally moved to moly coated 150 E-tips, 140 and 160 accubonds and used them for a while till I got bored with the ho hum wind drift numbers and rebored/rerifled it to a 338 RCM. It was retired with 875 rounds through it and it still shot very accurately.

moly coated 140 accubonds were very accurate velocity 3422 using RL-17
moly coated 150 E-tips also accurate velocity 3350 using RL-17
Also tried some moly coated 160 accubonds velocity 3320 using RL-25

Ross
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  #7  
Old 02-17-2014, 10:25 AM
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Join Date: Jan 2014
Location: Good ol USA
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Re: what velocity your getting ???

Interesting lessons,

I will stick with 1-9 twist
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