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Hmmm... I've got a 25/308 AI reamer just begging to be used.I've been messing with some 138 Gr., via a .257 Ack. Imp 40* - show promise: 25/308 should be decent. RG
Hmmm... I've got a 25/308 AI reamer just begging to be used.
FB is only .096, so I'll just throat it longer if needed.What free bore does your reamer have?
Tell me more about the 138’s.
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.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, 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"!I hope their efforts bear fruit. RG
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Has anyone shot light bullets, like the 87grs out of a fast twist barrel?
I was just wondering if they would hold tother and be accurate.
Hal
RG thanks for the reply.
I was thinking about making a 257 Weatherby with a quick twist.
I would like to try a few of the heavy bullets but wanted to be able to shoot some of the light bullets also.
What barrel would you try ?
Hal