270 & 19 3/4 in tube

mahony1977

mahony1977

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I have only worked up a few loads so far I'm useing hornady 140 grn BTSP interlocks & RL 22 . I started at 52 grns up to 58 one grn increments . Best group was just under 1.4 with 58 grns & 52 grns was about 2.9 , acuracy increased with the heavier loads .

So what i'm wondering is should i work it up to the max or will i just be waisting powder ? I have a bit of IMR 4064 & 4350 , maybe the 4064 would be a better choice ? There is only 19 3/4 in of rifleing it's been cut down & breaked .
 
the more powder you add, the faster it will go, doesn't matter how long or short the barrel is. In a 19.75" tube you'll probably be about 125 fps slower than a 22-24" barrel 270. Not a big deal. Probably a loud mofo with that brake though
 
Up to 60 grns then , just wondered if the 4064 would be better in the shorter bbl , seems so it burns faster ?

& it's loud ! I do bevieve it would make you'r ears bleed without ear muffs . Luckily i got a muffler with it . Simply slides over the muzzle & redirect the gas out the front .
 
If the gasses from the muzzle brake are directed forward, how can that be a brake?
Me thinks you are far better off with a 270 of 22 or 24 inch barrel. Normal noise, better velocity, no muss no fuss.
 
H4831 said:
If the gasses from the muzzle brake are directed forward, how can that be a brake?
Me thinks you are far better off with a 270 of 22 or 24 inch barrel. Normal noise, better velocity, no muss no fuss.
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It still acts as a break the gasses go out to the side and then forward . It's about 1.5 in diameter x 2.5 long there is a chamber the length of it & ports in the face around the muzzle so the gas can still escape . hard on the blueing around the brake though .I bought it set up like this for cheap with the intention of re bbl but I kinda like it .
 
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Even the slowest rifle powder is fully burnt in the first foot of barrel length.

The longer the expanding gas can push on the bullet however the faster it will ultimately go. This is why longer barrels - to a certain point - will propel a bullet faster than a short one regardless of the powder used.
 
This is true. I have a Sako .300 Winchester Magnum with a 22.5 inch barrel. I'm still getting a solid 3,050 over the chronograph with a stout charge of Vihtavuori N560, but the blast and fireball are beyond belief. (Fortunately, it puts three shots into about an inch at 200 metres...) It makes me almost think that the Finns mix a bit of Plutonium into N560!
 
Why not? said:
If the gases end up going forward, there will be little, if any, brake effect. :runaway: Newton's third law of motion.

The noise will be substantially reduced, however, and the perceived recoil certainly less.

Ted
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Maybe all in my head . Still dosn't seem to kick a lot for an M70 featherweight , the only other rifle i have that should be of comparable recoil is a BSA CF2 in 308 . Id say they are about the same with the gizmo on the 270 .
 
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