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270 WSM 165gr VLD load help

 
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  #36  
Old 10-17-2011, 08:04 PM
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Re: 270 WSM 165gr VLD load help

Quote:
Originally Posted by emmagator View Post
Any load data updates for the 165 270wsm?
I tested 2 loads:
These loads correspond to Nosler Partion 160gr starting loads minus 3 gr of powder.
  1. startind load of 54gr of H4831
  2. starting load of 62gr of Retumbo
Work your way up carefully!

For the time being, I've abandonned my 270 WSM 165 VLD experiments because of excessive barrel heating and large recoil/blast which is too much for serious F-Class shooting in a 14lb 24" rifle.

Alex
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  #37  
Old 10-17-2011, 08:17 PM
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Re: 270 WSM 165gr VLD load help

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Originally Posted by 270 Sender0 View Post
The numbers you use for stability factor, 1-10 twist at 1.49, is the lower number better or the 1-8 twist at 2.33?
270Sender0,

not sure if you got an answer

using the JBM calculator, you want to be in the 1.3-2.0 range for stability factor

anything less is undesirable as it may not stabilize thus accuracy will suffer and more won't help

-- richard
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  #38  
Old 10-17-2011, 11:02 PM
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Re: 270 WSM 165gr VLD load help

Quote:
Originally Posted by rscott5028 View Post
270Sender0,

not sure if you got an answer

using the JBM calculator, you want to be in the 1.3-2.0 range for stability factor

anything less is undesirable as it may not stabilize thus accuracy will suffer and more won't help

-- richard
I checked that in 1-10" 2900fps the 165gr VLD was adequately stable over 15C (59F) at 0ft above sea level. This means that I can't use it for moose hunting in my part North East Canada at this time of the year. (Stability depends on air density which is a function of altitude and temperature - and I live in a cold low spot in North America).

As for the stability factor, even 3 works well for a match bullet but not so great for a cheap millitary FMJ in which case 2 is the maximum value.

Finally, Krieger barrels made a small batch of 0.270" barrels with a 1-8.5 barrel which is optimal for Matrix Ballistics 165gr VLD and 180gr VLD.

Alex
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  #39  
Old 10-17-2011, 11:26 PM
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Re: 270 WSM 165gr VLD load help

How many shots over what time period do you shoot for F class, I've been thinking about taking some kind of target shooting up but I was thinking about chambering up a 270 win barrel instead of using my 270 WSM.
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  #40  
Old 10-18-2011, 12:05 AM
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Join Date: Apr 2011
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Re: 270 WSM 165gr VLD load help

Quote:
Originally Posted by bigngreen View Post
How many shots over what time period do you shoot for F class, I've been thinking about taking some kind of target shooting up but I was thinking about chambering up a 270 win barrel instead of using my 270 WSM.
The problem is not the number of shot during a match (often 3 x (15 shots + 2 sighters in 17 minutes)) but the fact that I often shot 75 rounds in 1 day and that even at a slow fire rate the barrel gets really hot after 5 shots! Remember that 270WSM accurate, 1/2 MOA or better at long range, barrel life is 750-1000 rounds.

Another larger issue is recoil/blast which degrades my accuracy after 5-10 shots fired from a 13.5lbs rifle. My groups go from 5 shots 1/2 MOA to 5 shots 3/4 - 1 MOA! This never happens with a similar weight 243 Win driving a 105gr VLD at 3000fps or a 223 Rem driving a 73gr VLD at 2900fps.

The F-Open class is a race between 7WSM, 284Win, 300WSM and other 7mm Wildcat magnums (the biggest issues here is performance and barrel life).
The only inexpensive way to shoot F-Class competively is F-TR Class in 223 Rem or 308 Win.

Alex
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  #41  
Old 10-18-2011, 08:13 AM
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Re: 270 WSM 165gr VLD load help

Quote:
Originally Posted by AlexF View Post
The problem is not the number of shot during a match (often 3 x (15 shots + 2 sighters in 17 minutes)) but the fact that I often shot 75 rounds in 1 day and that even at a slow fire rate the barrel gets really hot after 5 shots! Remember that 270WSM accurate, 1/2 MOA or better at long range, barrel life is 750-1000 rounds.

Another larger issue is recoil/blast which degrades my accuracy after 5-10 shots fired from a 13.5lbs rifle. My groups go from 5 shots 1/2 MOA to 5 shots 3/4 - 1 MOA! This never happens with a similar weight 243 Win driving a 105gr VLD at 3000fps or a 223 Rem driving a 73gr VLD at 2900fps.

The F-Open class is a race between 7WSM, 284Win, 300WSM and other 7mm Wildcat magnums (the biggest issues here is performance and barrel life).
The only inexpensive way to shoot F-Class competively is F-TR Class in 223 Rem or 308 Win.

Alex
A couple more questions if you don't mind, can you use a muzzle brake and what is the weight limit? I'm finding the idea intriguing!
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  #42  
Old 10-18-2011, 09:05 AM
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Re: 270 WSM 165gr VLD load help

Quote:
Originally Posted by AlexF View Post
The problem is not the number of shot during a match (often 3 x (15 shots + 2 sighters in 17 minutes)) but the fact that I often shot 75 rounds in 1 day and that even at a slow fire rate the barrel gets really hot after 5 shots! Remember that 270WSM accurate, 1/2 MOA or better at long range, barrel life is 750-1000 rounds.

Another larger issue is recoil/blast which degrades my accuracy after 5-10 shots fired from a 13.5lbs rifle. My groups go from 5 shots 1/2 MOA to 5 shots 3/4 - 1 MOA! This never happens with a similar weight 243 Win driving a 105gr VLD at 3000fps or a 223 Rem driving a 73gr VLD at 2900fps.

The F-Open class is a race between 7WSM, 284Win, 300WSM and other 7mm Wildcat magnums (the biggest issues here is performance and barrel life).
The only inexpensive way to shoot F-Class competively is F-TR Class in 223 Rem or 308 Win.

Alex
Depending on how competitve you want to be...

One of the more cost effective ways to get into F-Class would be to use a Savage 12F in 6.5x284 or 6br. The latter will give you excellent barrel life, but a hair less competitive in the wind.

Then again, it's not much of a dual purpose target/hunting rifle either.

-- richard
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