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Normal Topic 7mm08 140BT help please. (Read 1865 times)
boowacker
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7mm08 140BT help please.
Sep 8th, 2019 at 2:28pm
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My Finnlight loves BT140s. Iíve shot heaps of fallow and reds with it. One serious issue is often I find I need a follow up shot especially on big reds. As a result I thought I would look for a replacement projectile assuming they are exploding and not getting enough penetration.
In the process, for the first time, I put a few shots of the BTs through a chrony. They were only doing high 2400s Shocked
Is this the issue? What do they do at these speeds under 300m?
The same day I fired 5 shots in a 15mm group at 100m so theyíre certainly accurate at this speed.
Thoughts?
  

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Micky Duck
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Re: 7mm08 140BT help please.
Reply #1 - Sep 8th, 2019 at 3:55pm
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personally...I would load up some 140grn partitions for bush/stag work and leave the load alone....its working and you were happy UNTILL you got the plurry chronicgraph out.... you COULD up your load and see if accuracy stays...or just be happy.
  
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Re: 7mm08 140BT help please.
Reply #2 - Sep 9th, 2019 at 5:53pm
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They wont be exploding at 2400fps. You may have the opposite problem at 300yds with lack of expansion.
  
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Re: 7mm08 140BT help please.
Reply #3 - Sep 9th, 2019 at 6:47pm
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where in the body are you aiming?that maybe more of an issue
  
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Micky Duck
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Re: 7mm08 140BT help please.
Reply #4 - Sep 9th, 2019 at 7:15pm
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rumour has it the federal blue box goes faster than other brands in the 7mm/08 for some reason..... it might be an option worth exploring.
  
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Re: 7mm08 140BT help please.
Reply #5 - Sep 10th, 2019 at 6:03am
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Are you reloading the 140NBT or using factory ammo?
  
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Re: 7mm08 140BT help please.
Reply #6 - Sep 10th, 2019 at 11:32am
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Micky Duck wrote on Sep 9th, 2019 at 7:15pm:
rumour has it the federal blue box goes faster than other brands in the 7mm/08 for some reason..... it might be an option worth exploring.

i can vouch  for the statement on the box,in my 300wsm on the box says 2980 and my chrony came up with 2982 in a 22 inch barrel
  

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Re: 7mm08 140BT help please.
Reply #7 - Sep 10th, 2019 at 4:38pm
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For  me  Wink139 grain sst in front of 2208 powder works well. mucked about with different powder charges till i found the best accuracy wise, dont worry too much about the bullet speed but a good first shot is the answer. a good group after that is a bonus,
  

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Re: 7mm08 140BT help please.
Reply #8 - Sep 17th, 2019 at 8:21am
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They are reloads. When I initially settled on the load this one really stood out.
Definitely better bullet placement would help, it always does.  I loaded some VLDs and they shot really well so I might try them knowing I have an accurate load to fall back on. I might just forget the chrony.
  

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Re: 7mm08 140BT help please.
Reply #9 - Sep 17th, 2019 at 11:01am
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Forget the chrony... go for accuracy first and foremost!

You could always drop down in projectile weight to a 120 gr BT as youíll find that projectile slightly harder with thicker copper wall.

I load for 2 x T3 7mm-08ís & my own Kimber 7mm-08 with 120 gr Sierras which have been used on fallow to huge red drags & just drops them.

From the recovered projectiles thereís been a good wound channel, beautiful mushroom & weight retention from the projectile as youíd expect

  

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Re: 7mm08 140BT help please.
Reply #10 - Sep 19th, 2019 at 1:20pm
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I can back up seventeenths on this, I have 120gr Sierra SP and also load 140gr BTs - Iím using 2206H for powder and getting 2800 FPS for the 120s and 2700 for the 140s - havenít had any issues. Seventenths had good load data for the 120s and I did the data for the 140s - Jakkos been using the 139 load for a long time so heís got it bang on for his gun.
  

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Re: 7mm08 140BT help please.
Reply #11 - Sep 20th, 2019 at 5:47pm
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Thanks. The VLDs are shooting spot on. If I have any issues Iíll try 120s. 👍
  

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