New Berger 25cal 135gn LRHT

sierracharlie338

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They finally joined the 25 caliber party. What are y’all’s thoughts?
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West Calamus

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what twist rate would one need for these? 1-8 ? What would be the ideal case? Could a 257 weatherby get it up to 2900 fps?
 

VLD Pilot

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what twist rate would one need for these? 1-8 ? What would be the ideal case? Could a 257 weatherby get it up to 2900 fps?
Well at 2900 and roughly 1000' elevation with an 8 twist barrel, you'd be right at bullet stability. 1.5 is your number. Guessing your 257 Wby mag will push that bullet closer to 3300 in at least a 24" barrel. It becomes 1.56 at 3300 fps. Altitude is your friend unless you speed up the barrel twist
 
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VLD Pilot

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I'm waiting on a 7.5 barrel for my 25-284 build. I'm right around 1000 ft ASL. Looking at around 3100-3150 fps. The 257 Why mag is much faster but speed alone won't help the stability issue much. A little altitude or and half inch faster twist will do wonders.
 

West Calamus

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Well at 2900 and roughly sea level with an 8 twist barrel, you'd be right at bullet stability. 1.5 is your number. Guessing your 257 Wby mag will push that bullet closer to 3300 in at least a 24" barrel.
So a 1-7.5 would probably be ideal. My 25-06 usually pushes 120 gr at 2950 so would the 06 push the beger at maybe around 2800 to 2850fps
 

West Calamus

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2950 is super conservative for a 120. A 7.5 is perfect for the 06 cartridge with the 131 or new Berger. You'll easily get 3000+ with the 135
let me guess you use RL powder. Out of 24 inch barrel my 25-06 with max charge of 50.2 of IMR4831 only does 2950 fps with 120 gr speers.
 

VLD Pilot

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let me guess you use RL powder. Out of 24 inch barrel my 25-06 with max charge of 50.2 of IMR4831 only does 2950 fps with 120 gr speers.
I personally do not but RL26 is what I'm quoting. I use it in some cartridges but not many. It's a great option but H4831 is also
 

BEEMAN

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VLD pilot you are dead on with your velocity hopes with the 25-284. I’m getting 3151 FPS with the 131 BJ out of a 26” Helix6 1-7-25” twist. I agree the 25-06 should be running a 120 way faster than that. My 25-06AI used to shoot 115 Berger’s at 3350 FPS with H1000. I would refer to Blackjacks site as they recommend varying twist rates for certain cartridges. I would error on the faster twist than the slower twist.
 

VLD Pilot

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VLD pilot you are dead on with your velocity hopes with the 25-284. I’m getting 3151 FPS with the 131 BJ out of a 26” Helix6 1-7-25” twist. I agree the 25-06 should be running a 120 way faster than that. My 25-06AI used to shoot 115 Berger’s at 3350 FPS with H1000. I would refer to Blackjacks site as they recommend varying twist rates for certain cartridges. I would error on the faster twist than the slower twist.
My barrel order was for a finished 24". Tried to change it but it was too late. It's gonna arrive at 25" as a Bartlein Carbon wrapped model. I think I can keep it at 25" without removing any length unlike an all steel barrel. There trimmed down to use pretty much at full length. That's why I figured a bit slower than a 26-28" barrel pushing the 131s.
 

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