We can definitely load that little fifty five and maintain four thousand feet per second without any pressure signs
Will those little burgers hold up?That's the question
Will those little burgers hold up?That's the question
Yeah Baby !! 204 Slingshot time
- Thread starter Shotafterdark
- Start date
urbanrifleman
Site $$ Sponsor
I don't mean to second guess, but, why a 7 twist?
Terminal spin for an 8 twist is 3500 fps. 4000 is way over terminal spin in an 8 twist. Terminal spin is 3000 fps in a 7 twist. So, you'll be 1000 over terminal. The bullet will be deforming on the way to the target.
7315br
Silver $$ Contributor
The answer is...probably not. Years ago I tried what you are trying to do now. I even did a .20-.223WSSM... "a really stupid move". I recall it took another 12 grs of powder to go another 190 fps faster than a .20 BR with the 55 gr Berger! I was trying to get to a 1000 yds + with a .20 cal. for Praire Dogs. I never made it with the .20-.223WSSM. It was a Royal PIA to make brass! I finally cut the barrel back at about 50 rds and made a .20 PPC. Much better...lol!
I did make the 1000yds + on PD's with the .20/.250...but it proved not worth the effort. I did manage to smack a number of PD's (I recall 1135 yds as the furthest kill)...but the 55 gr Berger started to pencil on hits beyond 800 yds. One had to break bone or a headshot beyond the 800 yd distance. All of my barrels were 9 or 10 twist bbls. Folks back then were complaining of the 55gr Berger having failures after 300 rds or so with even 8-twist bbls (much less a 7-twist) on this forum.
I then went to the .22/.243 Improved. Problem solved!!
I spent a ton of money to find all this out. You will too...lol! Best of luck in your endeavor.
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AckleymanII
Gold $$ Contributor
OP, did you order a die reamer(S) for full length sizing Ger'r done!
What happens if you exceed “terminal spin?”
I did NOT ,,I Have already made a custom die and dropped a Redding bushing die on top of it at the neck juncture and the top of the shoulder..
I will do this for the 250 as well
I'm not worried about the shoulder set back
when that time comes and the bolt starts to close a lil tight
I already have a shell holder with a few thousand ground off
see how easy that was to remedy ?? lol
I'm not spending another $250 when it's not needed.
See that surface grinder in the back room ? he has 3 of them ...
cylindrical grinder as well.... We have a full tool room to play in.
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Hey Brad always a pleasure to have you around I have decided to just use the 55's in the 20 sploder you sent me in my Tikka ,
I've already played with that and I can keep it at 3500 no problem
I Have decided to take an exit ramp and avoid any problems Just got off the phone with Don and he is going to supply me with some 62 and heavier, that he says people are using daily at 3900 feet per second without any incidents going out to 1000 yards.
He said "they are hitting coyotes with them and doing a devastating job" on them
his words,
He has some 60 grainers I believe on hand right now that I'm going to get sent ASAP
And we will move forward with this project without worry
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LOL !! Spent a ton of money pursuing an endeavor that you set out on ...
Nothing wrong with that ,,,,at least you had the drive to do it...
I think that is commendable in itself
All right I just got off the phone with Don I gotta tell you he is an American treasure
I honestly don't think Boots Obermeyer had anything over on Don
After talking to him about his custom reamers he has made to match the ojive to his barrels and his bullets
He also has a step at the datum line on the shoulder he calls a dual radius
And we talked in detail about that He is certainly a wealth of knowledge
I'm gonna have him make me up about 4 barrel blanks after the first of the year right after he makes me a batch of 500 63 grainers
I have 200 63 GR VLD on the way
100 57 VLD
200 55 VLD
He said 63 is as heavy as he can go in a 20
And that's quite alright with me That little thing is over an inch long
His cell number is 804 221 0161
If anybody decides they want some of these bullets as well That's the best way to get a hold of him and his landline is still available he says he will always have that maintained.
I honestly don't think Boots Obermeyer had anything over on Don
After talking to him about his custom reamers he has made to match the ojive to his barrels and his bullets
He also has a step at the datum line on the shoulder he calls a dual radius
And we talked in detail about that He is certainly a wealth of knowledge
I'm gonna have him make me up about 4 barrel blanks after the first of the year right after he makes me a batch of 500 63 grainers
I have 200 63 GR VLD on the way
100 57 VLD
200 55 VLD
He said 63 is as heavy as he can go in a 20
And that's quite alright with me That little thing is over an inch long
His cell number is 804 221 0161
If anybody decides they want some of these bullets as well That's the best way to get a hold of him and his landline is still available he says he will always have that maintained.
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