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- Oct 22, 2014
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By my “poof” comment, I meant of smoke from the oil. Not bullet blow up.
Search up 22 Hardaway Hammer, basically this.22-300 WSM (22 FORM) is inevitable now.
-J
One has been built although he may have moved the shoulder forward slightly and shortened the neck to gain capacity.22-300 WSM (22 FORM) is inevitable now.
-J
Did you decide the retumbo was too hot on the 1st blown primer or the 3rd??![]()
Form, what cover are you running on the Xero? Any good?The first barrel (a rechambered Tikka) was questionable. There were issues and it wasn’t certain if it was a brass issue or a barrel issue. It turned out to be at least partly a brass issue. Got different brass, and a new barrel to rule that out.
As expected, it’s a bit picky to start. I believe that I stated 40 rounds from brand new to find a load to hunt with- and it will be under that. 20 inch barrel.
H1000 load with 80gr ELD-X, 3,612fpw average
View attachment 754974
N570, 3,626fps MV average-
View attachment 754975
Retumbo, 3,708 fps MV-
View attachment 754976
Do not copy these loads. This is experimentation, and we don’t know what is correct yet. Clearly the Retumbo was too hot.
Dropped 2 grains on Retumbo and tried again- 3,556fps MV
View attachment 754978
All groups are ok and usable, but not great. I believe it is primarily a not using the correct powder issue, and the brass is a potential problem (reusing 6UM brass as no new is available). But I expect this to settle in at around 3,550fps MV with 80’s (maybe a bit faster). Recoil is a same/same to a 6cm.
Looks like Gray Ops bump cover?Form, what cover are you running on the Xero? Any good?
Hmmm, makes me wonder if there is a point of diminishing returns.
My 22-250AI with a 25” barrel shooting 90 grain A-Tips has gone over 3400fps during load development. This is with Lapua LRP brass.
I’m currently playing with fireformed 22CM Alpha SRP brass to check results with them.
I also have some necked down and trimmed 277 Fury hybrid brass that I’m working on getting loads for. I expect to be able to hit 3500+ with under 50 grains of powder. The primer will be the weakest part in this setup.
I think the whole point is to shoot even heaviers in the 22UMWhen do you start stuffing the golden god (77 tmk) in there? You're going to be 1,000fps faster than my 16" .223s. Crazy.
When do you start stuffing the golden god (77 tmk) in there? You're going to be 1,000fps faster than my 16" .223s. Crazy.
You dont think they'll go poof at those velocities?Tomorrow. However, as @atmat stated the main goal was to shoot 88’s or 80gr ELD-M/X.
You dont think they'll go poof at those velocities?
So that would be 3,275 fps (ish) with a 20” barrel, and at around 80,000 psi.
At 65k chamber pressure and a 90gr bullet, it’ll still be around 3,150’ish with a 24” barrel. Of course if one ups the pressure, velocity will be much higher.
That is the way to do high pressure loads.