25 - 47 Lapua
- Thread starter greisdor
- Start date
Blackjack bullets' Facebook page has some pics of targets shot with the 25x47L. But until the next batch of reamers become available this month, still not a lot of shooters out there yet. Haven't heard anything negative on builds made around it. Waiting on barrel and reamer myself to give it a go.
Have been shooting them (25x47 Lapua) in BR competition since 2010, and have done reasonably well using 1:9" twisted barrels and 110 Gr. BT - a pair of 200 yard wins, one Grand Aggregate , and several more top5/10s in Yardage/Grand Aggs., at NBRSA Hunter Nationals.
It's a very good capacity for .25 Cal. - capacity & performance is similar to a .250/3000 Ackley Imp.
RG
It's a very good capacity for .25 Cal. - capacity & performance is similar to a .250/3000 Ackley Imp.RGI've been messing with some 138 Gr., via a .257 Ack. Imp 40* - show promise: 25/308 should be decent. RG
P.S. I forgot, the length of the experimental 138s dictated the use of 1:8" twist. I don't recall the bullet length - if any interest, I measure again, and run the numbers through Tioga.
RG
P.S. I forgot, the length of the experimental 138s dictated the use of 1:8" twist. I don't recall the bullet length - if any interest, I measure again, and run the numbers through Tioga.
RG
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pikespeakgoat
Gold $$ Contributor
Hmmm... I've got a 25/308 AI reamer just begging to be used.
Not the x47, but I have a 25 Creedmoor being chambered right now for PRS. the cartidge is really determined by the use. For what I'm using it for, I can run around 3000fps and have a very good bc. I looked at the 25x47 and then doing a 257-260AI, but the numbers just didn't line up for me. The 25-260AI should run that bullet very well.
Getting the stuff together to do another .25 Souper Improved with an 8 twist. The one I have now is a 10 and is lights out with 115 Bergers. This is where I am finding that the Berger 115's are very scarce now so I am hoping the 131's are the ticket. Just got my oal for some Nosler Silvertip 115's to go try when the snow stops later. We definitely need the creed moor thing to happen in 25 caliber so bullets won't dry up...
What free bore does your reamer have?
pikespeakgoat
Gold $$ Contributor
FB is only .096, so I'll just throat it longer if needed.
This pic is a screen shot of the Tioga Engineering bullet design calculator/comparator, for a pair of 25 Cal. bullets, both from the same tangent 10 ogive, 0.050” me’plat, point die: left is 110 Gr. BT; Rt. 138 Gr.BT. I used 3000FPS for the comparison, and slightly denser than Std. sea-level. Note that I didn’t alter the atmospheres from past use, thus, 1.018 vs 1.020 - but that is of little consequence. My primary goal is to obtain a solid twist rate for a particular bullet, and Tioga (William C. Davis Jr.) does just that. This program calculates only the G1 BC - it’s forte is being able to adjust the specific gravity of construction to match the actual bullet - regarding the overturning moment, that does make a difference!
I have followed the BlackJack threads with interest, in the hopes that someone would deliver a means of preventing the total demise of the .25 Cal cartridges.
While there is no compelling reason to have one, I confess to being a life-long 25 junkie, and have always wondered why one of the BIG rifle manufacturers never pursued a HIGH BC 20 Cal bullet/BBL/Cartridge 
- such a combination would rival, or exceed anything else. Winchesters 25WSSM was a complete waste - a full-blown 25/300WSM, now, that’ll work. BlackJack may be the savior . . .My own pursuit has taken a while, and I am set to explore 25 Cal. bullets of up to, 138 GR., but, for the length to which I pinched the jackets, will likely cut the weight back to around 135, or, 136GR (the reasoning for that is another topic). No one will be willing to pay what I’d want to get for the heavy weights, as the making of them entails almost double the labor, and precious few will pay for top quality 25 Cal. bullets now . . . and, regrettably, 25 Cal. BR quality jackets are going to become almost unobtainium sooner than later.
My first range session, with the 138 GR, through a bartlein 1:8” 4-groove showed promise - 3/8ths” groups. I had only enough time to fire-form some .257 Ack. Imp. brass. Not horrible results for F-F with that cartridge.
HIGH BC 25 Cal. bullets have great potential - the “problem”, as I see it, is getting people to plunk down cash for the “unproven”. Success will require people, solely because they, “want to”, slapping down some dinaro and taking the gamble. "Because they want to", is how pioneers discover stuff . . .
GO BlackJack - they are expressing a lot of, "dare to be different"!
I hope their efforts bear fruit. RG
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nakneker
Gold $$ Contributor
Nice post Randy, your a big reason why I own a 25x47L and your 110s are lethal little dudes. I’m with you, someone help the quarter bores revive and thrive.This pic is a screen shot of the Tioga Engineering bullet design calculator/comparator, for a pair of 25 Cal. bullets, both from the same tangent 10 ogive, 0.050” me’plat, point die: left is 110 Gr. BT; Rt. 138 Gr.BT. I used 3000FPS for the comparison, and slightly denser than Std. sea-level. Note that I didn’t alter the atmospheres from past use, thus, 1.018 vs 1.020 - but that is of little consequence. My primary goal is to obtain a solid twist rate for a particular bullet, and Tioga (William C. Davis Jr.) does just that. This program calculates only the G1 BC - it’s forte is being able to adjust the specific gravity of construction to match the actual bullet - regarding the overturning moment, that does make a difference!
I have followed the BlackJack threads with interest, in the hopes that someone would deliver a means of preventing the total demise of the .25 Cal cartridges.
My own pursuit has taken a while, and I am set to explore 25 Cal. bullets of up to, 138 GR., but, for the length to which I pinched the jackets, will likely cut the weight back to around 135, or, 136GR (the reasoning for that is another topic). No one will be willing to pay what I’d want to get for the heavy weights, as the making of them entails almost double the labor, and precious few will pay for top quality 25 Cal. bullets now . . . and, regrettably, 25 Cal. BR quality jackets are going to become almost unobtainium sooner than later.
My first range session, with the 138 GR, through a bartlein 1:8” 4-groove showed promise - 3/8ths” groups. I had only enough time to fire-form some .257 Ack. Imp. brass. Not horrible results for F-F with that cartridge.
HIGH BC 25 Cal. bullets have great potential - the “problem”, as I see it, it getting people to plunk down cash for the “unproven”. Success will require people, solely because they, “want to”, slapping down some dinaro and taking the gamble. "Because they want to", is how pioneers discover stuff . . .
GO BlackJack - they are expressing a lot of, "dare to be different"!
View attachment 1085204 View attachment 1085205
This - the high velocity tolerance - may well depend upon as much about an individual barrel, or even family of barrel, as opposed the bullet/jacket. I have a pal, who has shot my 88 Gr. BT @ about 4K FPS via his 257Idiot Mag (I loaned him my reamer - .257/300WSM) with very good results . . . well, except from a coyotes perspective - his dead coyote pics are grim, ineed.
I have shot only a few prairie dog with those bullets via the 257IdiotMag - just to see how gruesome the result would be: the result was predictably devastating. Way too much gun for PDs.
I use the 88 BT for BR competition via 25BR. I'd bet that many (most?) of the 87 Gr. (+/- a little) bullets available would hold up to around 4K FPS. RGP.S. Oooops - I forgot - the pal, above, has a 1:10" twist PacNor on his IdiotMag rig.
Presuming that you mean brand/maker, for button barrels I lean toward PacNor SSSM, and Hart,
for cut, Bartlein. Regarding twist rate, I'd leave that up to the bullet maker's recommendation - twist rate is more about length than weight - I have no idea of how long the BlackJack bullets are,
or, even if they have polymer tips, which, for a given weight, usually substantially increases the length, thus dictating a faster twist. RG
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