6.5 PRC vs 257 WBY Mag

[Ironworker]

I was thinking of getting a 6.5 PRC ,but even though the .264 bullet has a superior B.C over the .257 The velocity of the .257 Hornady 110 ELDx at 3600 trumps the 6.5 PRC even with 150gr Sierra at .713 BC .... But my 6mm Creedmoor with its fast twist Bartlien bbl will shoot circles around my Bartlien bbl 257 WBY . Is that because the 6mm CM simply isn't a fire breathing dragon like the 257 is ?

 

[wboggs]

I suspect the .257 Wby has a very short barrel life when loaded like that. I used to have a .257 with a krieger target barrel and could never get good groups. But, they are plenty good enough for hunting and will.never be used for matches. Half your barrel life will be gone developing loads and fast long strings will finish it off quickly.

 

[Ironworker]

I'm careful about how many and how often I shoot it. Great hunting accuracy ,but definitely not a target rifle.

 

[Beruisis]

when I reloaded for the 257 Roy, I couldn't develop anything more accurate than their factory ammo.

 

[Ironworker]

I'm getting 3 shot 3/4-1 MOA at 100yds then let the bbl cool down for a week.With my 6mm Creed I can get 1/4 MOA all day long.

 

[Beruisis]

Best I could reload was 1.25" groups in the Roy but 25 Crd gives me 3/8" everytime.
Yeah I only shot 3x & gave it a rest too. That Roy was a slow twist Kleingunther & I sold it back to the original owner. Thinking about getting another but 10T.
Would you go with the Remington or Mark V? I lean towards the V.

 

[AckleymanII]

The Roy with a zero to .030 freebore chamber shoots tiny groups. All that freebore does nothing for bullet alignment.

My load was 71.5g of R#22
Fed 215
100g Nosler ballistic tip, touching the lands
3850 fps out of a 26" Pac Nor three groove barrel, 10T
Bug holes were normal, on the sendero weight fluted barrel.

Today, I would go 9T, throat for a 115g for 3600 fps

 

[Ironworker]

Best I could reload was 1.25" groups in the Roy but 25 Crd gives me 3/8" everytime.
Yeah I only shot 3x & gave it a rest too. That Roy was a slow twist Kleingunther & I sold it back to the original owner. Thinking about getting another but 10T.
Would you go with the Remington or Mark V? I lean towards the V.

Mark V and mine has a 10"twist .

 

[AckleymanII]

Buddy of mine killed 6 nice bull elk with his Mark 5 shooting factory ammo. Then a guide told him it was not an elk rifle.

 

[Beeman]

To make a more fair comparison, run the numbers on a 131 Blackjack out of the 257WBY. You may be surprised.

 

[wboggs]

The Roy with a zero to .030 freebore chamber shoots tiny groups. All that freebore does nothing for bullet alignment.

My load was 71.5g of R#22
Fed 215
100g Nosler ballistic tip, touching the lands
3850 fps out of a 26" Pac Nor three groove barrel, 10T
Bug holes were normal, on the sendero weight fluted barrel.

Today, I would go 9T, throat for a 115g for 3600 fps

Many gunsmiths will not use this throat due to liability concerns. Who knows what the.pressure of factory ammo would be

 

[Ironworker]

Clocked my loads today 69grs of IMR 7828 SSC pushed a Hornady 110 ELDx 3520 . 69grs of Re#19 pushed a 90gr Sierra green tip 3505 ? I was expecting faster .

 

[Nomosendero]

Clocked my loads today 69grs of IMR 7828 SSC pushed a Hornady 110 ELDx 3520 . 69grs of Re#19 pushed a 90gr Sierra green tip 3505 ? I was expecting faster .

Which barrel length? I would work up slow of course with the 110 ELDX, I have a Lipsey Number 1 with a 28" tube, that should be a screamer.
Have you shot any game with that 110 as yet?

 

[AckleymanII]

Many gunsmiths will not use this throat due to liability concerns. Who knows what the.pressure of factory ammo would be

No worries, factory ammo will not chamber, bullet is seated deep in the case.

 

[Ironworker]

Which barrel length? I would work up slow of course with the 110 ELDX, I have a Lipsey Number 1 with a 28" tube, that should be a screamer.
Have you shot any game with that 110 as yet?

26"bbl Haven't been able to draw a tag. But I'll take it out for coyotes .

 

[wboggs]

No worries, factory ammo will not chamber, bullet is seated deep in the case.

Good point. The gunsmiths I have talked with must be ultra sensitive to any problem using non factory specs.

 

[AckleymanII]

After seeing how accurate and fast the Roy was with zero freebore, I had a reamer ground. A gunsmith out of San Diego gave the info that the Winchester brand of 264 Winchester could be necked down in one swipe with a 257 Weatherby full length sizer. Sure enough, the double radius is formed perfectly. The neck is a tad shorter which fixes any mix up in any factory ammo ever being able to be used in the chamber.

Winchester 264 brass is tough, they key is to neck down three rounds and send to Reamer maker with bullet seated the length you want.

 

[86alaskan]

If you're going to rebarrel, go ahead with the 257WBY and get a good 8 twist to let it shine with the 131's. I've yet to meet anyone shooting them that can't get great performance. The 257 out a a 26-28" barrel should be able to chuck those bullets out at least 3400fps, and no 6.5 is gonna keep up with that. I run those bullets around 3200 from my 25-06 and 7.5 twist barrel and it shoots flat and straight out to 3/4 mile all day.

 

[DesertDrifter]

257 Weatherby has more case capacity but will not be quite as friendly as a high volume shooter. If you rebarrel, doing the 1 in 8" twist to shoot the Blackjack's would put it ahead in trajectory and energy dump. The 6.5 PRC is pretty much a rebirth of the 6.5x284 which also another great cartridge.

 

[AckleymanII]

Many gunsmiths will not use this throat due to liability concerns. Who knows what the.pressure of factory ammo would be

Factory ammo will not chamber with .030 freebore.

concerning liability, neck down 264 or 7 REm mag factory brass for the 257 weatherby FL sizer, perfect cases. Now, send this brass off to have a 257 weatherby made with it's shorter neck with .030 freebore.