20 Sploder
- Thread starter urbanrifleman
- Start date
TA
The bolt head is fine. Soft brass won't indent the harder steel. They don't make brass center punches.
The test load was high enough pressure that it left brass on the face of the bolt. You could read what case was used for a test load.
The brass deposite wore off with a little use.
Hal
The bolt head is fine. Soft brass won't indent the harder steel. They don't make brass center punches.
The test load was high enough pressure that it left brass on the face of the bolt. You could read what case was used for a test load.
The brass deposite wore off with a little use.
Hal
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Ackman
Gold $$ Contributor
Some time back, early 1990's I believe, there was an article in Precision Shooting. If memory serves, the author's last name was White. (No, I'm not gonna search for it) He and another fellow tested the effect of less body taper, ie if the Ackley thing of less case taper had any bearing on bolt pressure. They set up a device to hold a T/C barrel, just the barrel, chambered in 30-30 and fire it remotely, safely. The 30-30 case has a lot of taper. That case shot out the back. Rechambered to 30-30AI and repeated.....the case didn't come out. It was a long time ago and I don't remember if it stayed in completely or came part way out. But I do remember the results. Ackley-ized chamberings do have less back thrust than parent cases with more body taper. And top end loads work well, they like to be pushed, where the standard cartridge very often doesn't.
About velocity. Well, I've tested 3 different 223AI. All chambered by the same riflebuilder with my reamer - .250nk, 0 FB.. The good one - 25" Schneider 14tw - with 40 BT's and 2015 powder, IMI brass, 7-1/2 primer. Accuracy /working loads chrono about 4100 to nearly 4200. Same exact 4100 load was 3900 in those 2 other 14tw. barrels. Those slower barrels should have been similar, but they weren't.
About velocity. Well, I've tested 3 different 223AI. All chambered by the same riflebuilder with my reamer - .250nk, 0 FB.. The good one - 25" Schneider 14tw - with 40 BT's and 2015 powder, IMI brass, 7-1/2 primer. Accuracy /working loads chrono about 4100 to nearly 4200. Same exact 4100 load was 3900 in those 2 other 14tw. barrels. Those slower barrels should have been similar, but they weren't.
PO Ackley did a similar test. He used a lever action IIRC. Been a couple decades since I read his books.
TAJ45
Silver $$ Contributor
Dave, l remember reading one of your way, way previous posts about bbl speed differences. Something that can really mess with logical thinking when deciding powder/primer xyz does or doesn't measure up to previous results after an identical chambering.
urbanrifleman
Site $$ Sponsor
20 Sploder. My large shank Savage barrel. Jim is from my club in Tulsa (Red Castle).
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Oklahoma Jim
Silver $$ Contributor
DISCLAIMER
These loads worked in my rifle. They may not work or be safe in your rifle. Work up your loads and watch for pressure signs.
These loads worked in my rifle. They may not work or be safe in your rifle. Work up your loads and watch for pressure signs.
urbanrifleman
Site $$ Sponsor
It's a 20-223 Ackley. I didn't invent it. I just gave it a name.
Mark M.
Silver $$ Contributor
It must be close then to a 20 Tactical?
urbanrifleman
Site $$ Sponsor
No. It is an improved 20 Practical. 40 degree shoulder like a 223 Ackley. You would fireform 20 Practical
Mark M.
Silver $$ Contributor
Interesting
Ackman
Gold $$ Contributor
Nice accuracy. The velocity will surely mess with one person's mind.
urbanrifleman
Site $$ Sponsor
Tikka t3 nut barrel. 1.07 straight with suppressor.
Majday
Silver $$ Contributor
28.7 tac
From what I gathered, nearly all the charges shot pretty well. I'm eager to see how the 40s shoot as well from him.
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