Is any body that built one of these still shooting them and what is your favorite load. I built mine to run the 131s but now that's not going to happen. I've tried some 135gr Berger's with pretty good luck with retumbo. Now I'm going to play around with the 145gr blackhole bullets.
250-7 Blaser (0.340 G7 @ 3400-3500 fps)
- Thread starter Romulus
- Start date
B23
Gold $$ Contributor
What about the new Hornady 134 ELD-M, have you tried any of those now that they are available? If you can get your hands on any Viht N570 with the 25 caliber heavies should be a very good powder choice for this size case. N570 is a little bulkier then even Retumbo but it'll produce better velocities too.
With 7mm Blaser mag brass not very easy to get anymore and ADG is going to be making 7PRC brass and the two are so very similar a 25 PRC based off of the necked down 7PRC could make for a near twin to the 25-7mm Blaser.
With the 7mm Blaser case having a pretty long neck and a bit of case taper I always thought a "improved" version with the shoulder blown out to 40° would make a pretty cool cartridge. Some years ago over on LRH forum I recall someone building a few 7mm Blaser Improved versions and I think their version had a 40° shoulder but I don't recall how much it increased case capacity. I wanna say it bumped it up to around 90gr H20 but I could be mistaken on that, I just don't remember all the particulars.
The 7 Blaser mag is a well designed case with kind of that Goldilocks size case capacity. Hornady must have thought so too because their new 7PRC is practically an identical twin to it.
No I have not tried the 134s yet do to I haven't found any yet. So your saying 570 would be a better choice? I have plenty of it to try.What about the new Hornady 134 ELD-M, have you tried any of those now that they are available? If you can get your hands on any Viht N570 with the 25 caliber heavies should be a very good powder choice for this size case. N570 is a little bulkier then even Retumbo but it'll produce better velocities too.
With 7mm Blaser mag brass not very easy to get anymore and ADG is going to be making 7PRC brass and the two are so very similar a 25 PRC based off of the necked down 7PRC could make for a near twin to the 25-7mm Blaser.
With the 7mm Blaser case having a pretty long neck and a bit of case taper I always thought a "improved" version with the shoulder blown out to 40° would make a pretty cool cartridge. Some years ago over on LRH forum I recall someone building a few 7mm Blaser Improved versions and I think their version had a 40° shoulder but I don't recall how much it increased case capacity. I wanna say it bumped it up to around 90gr H20 but I could be mistaken on that, I just don't remember all the particulars.
The 7 Blaser mag is a well designed case with kind of that Goldilocks size case capacity. Hornady must have thought so too because their new 7PRC is practically an identical twin to it.
B23
Gold $$ Contributor
Yes, I think you'll find N570 will give you somewhere in the neighborhood of 75 +/- fps over Retumbo at the same pressure. In larger magnums or things that are fairly overbore that have a lot of case capacity N570, often, produces some of the best velocities.
blue collar reloading has them and at the best price. I've ordered from them a lot over the years and they are top notch place to deal with.
Hornady 25cal 134gr ELD #2561
Product Information Caliber: 25 cal Bullet Diameter: 0.257” Bullet Weight: 134 Grains OAL: TBD" Bullet Style: ELD Match G1 BC: 0.645 Part Number: 2561 Quantity: 100 or 500
www.bluecollarreloading.com
Thank you!Yes, I think you'll find N570 will give you somewhere in the neighborhood of 75 +/- fps over Retumbo at the same pressure. In larger magnums or things that are fairly overbore that have a lot of case capacity N570, often, produces some of the best velocities.
blue collar reloading has them and at the best price. I've ordered from them a lot over the years and they are top notch place to deal with.
Hornady 25cal 134gr ELD #2561
Product Information Caliber: 25 cal Bullet Diameter: 0.257” Bullet Weight: 134 Grains OAL: TBD" Bullet Style: ELD Match G1 BC: 0.645 Part Number: 2561 Quantity: 100 or 500
CJ6
Silver $$ Contributor
There is a 6.71 Blackbird already...A 257 Blackbird may confuse "some"
B23
Gold $$ Contributor
Absolutely agree, certainly would be an easy peasy neck down. Does anyone make a neck bushing die for the Weatherby 6.5 RPM?
In a stand bolt face Rem 700 build, OAL would be to long for a Tikka, using a 26in pipe, something like a 25 RPM would be about as good as it gets. My only concern would be brass quality. If Weatherby's RPM brass is good stuff that'd be great but if it's not, wellll maybe not so great then.
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