Modern Sporting Rifle Evolution
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BandGEasy

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Reply with quote  #1 
Hi guys I'm hoping to get some information on barrel length on the 7mm var. I was wondering what your thoughts were on performance from an 18 inch barrel out to 400 yards vs a longer barrel, say 20 or 22 inch barrel. The goal would be deer size out to 400ish yards. Suggestions and ideas and options are welcome. I have a blank slate with the main goal of getting to 400 yards with stopping power so for now nothing really is off the table.
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BIGGDAWG

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Reply with quote  #2 
the valkyrie looses 28 fps per inch of barrel we have tested it a lot. 

here is one of the tests

barrel length compare.jpg 





My rule of thumb is if you are running an 18 i try to stay in the 120-130 class bullets 14 is ok but you drop in to the 2650 range for velocity.  the 20 inch barrels are 2700-2725 with the 140's  for me 20-24 i run 130-168 bullets in. i use the 140 accubond out to 300 yards and the 140 balistic tip past 300 yards both bullets shoot the same with the same load for me in 3 of my guns.   in the 18 i use the 110 tnt for varmint. the 120 nbt and 130 speer.   all that said for deer size game any length barrel from 18-24 will have over 1k energy at 400 yards.

i think the best all around length is a 20 inch with ranger profile it is about the same weight as an 18 spr profile. and you don't sacrifice the free velocity.


this is 24 inch barrel data


var compare.jpg 




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BandGEasy

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Reply with quote  #3 
Thank you BD. I was wondering where I would need to be. I appreciate the help.
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JohnOD

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Reply with quote  #4 
I shot this buck in Colorado at a lazered 360 yards with a 140 Ballistic Tip from my 7VAR. Hard quartering angle and a complete pass through (hit a rib on the exit). Barrel length was 20". At the elevations I hunt at it will still be skipping along over 1,800FPS at 500 yds. 

  IMG_20191109_103658.jpg 

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BandGEasy

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Reply with quote  #5 
JohnOD thanks for the reply. After looking at the data so for, I'm liking the 20 inch more than the 18.
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BIGGDAWG

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Reply with quote  #6 
just a little food for thought  a 20 inch with a target crown won't be much longer than an 18 with a brake and weight will be about the same.   hunting rigs i use target crown on unless i plan on using a suppressor.
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BandGEasy

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Reply with quote  #7 
That's good info. So far I only have a can for my 300BO, with no plans to use it on my next rifle build. Maybe on my 6.8 pistol but not this. I have time so I will give this rifle some consideration. Thanks for All of your help. I believe you and JohnOD have given and shown me enough info that i think that I will be more satisfied with the 20" rather than the 18".
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BIGGDAWG

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Reply with quote  #8 
I just got in a new blank from x caliber it is 3 groove 8.5 twist. i am making myself a 20 inch today to test thinking the 3 groove may give us more speed if that is the case ya might not loose as much with an 18.  i will report back in a few weeks after testing. will probably take it to the group shoot too.
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RangerJoe

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Reply with quote  #9 
BD - that is certainly an experiment I want to follow!
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BandGEasy

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Reply with quote  #10 
Great keep us posted.
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