I can't seem to get anymore speed 3320 with 80.5 berger 4831sc. I keep blowing primers and breaking triggers. Question is my Smith used a bore rider throat reamer when he chamber. I have no clue what this is. It shoots good just not getting speed I would like. Also its a tight neck. 250 so I turn brass. 012 which leaves me at. 248. Why am I spiking in psi so early. Peterson brass
22 creed
- Thread starter 75vmax
- Start date
What other problem are you referring to?
B23
Gold $$ Contributor
There's a lot of unknown variables here but if I was shooting eight shot groups that looked like the one you posted a picture of I think I could live with being a little down on velocity.
You say it's a tight neck so did the smith that cut the chamber give you a copy of the reamer print or tell you what you needed to turn the necks to?
Has it formed a carbon ring? Do you have a bore scope and if not one of the best 50 bucks you've ever spend would be to get yourself a Teslong borescope.
As was mentioned above RL26 and Viht N565 will likely gain you 50-100fps over the 4831sc that you're currently using but again your eight shot group is excellent so I'm not really sure what you're complaining about.
You mentioned the GS said your gun has a borerider throat, a borerider throat, in theory, is meant to allow higher load amounts to increase velocity while flattening and or lowering the pressure. It's kind of a strange thing as they seem to be more affective in some cartridges than others.
You say it's a tight neck so did the smith that cut the chamber give you a copy of the reamer print or tell you what you needed to turn the necks to?
Has it formed a carbon ring? Do you have a bore scope and if not one of the best 50 bucks you've ever spend would be to get yourself a Teslong borescope.
As was mentioned above RL26 and Viht N565 will likely gain you 50-100fps over the 4831sc that you're currently using but again your eight shot group is excellent so I'm not really sure what you're complaining about.
You mentioned the GS said your gun has a borerider throat, a borerider throat, in theory, is meant to allow higher load amounts to increase velocity while flattening and or lowering the pressure. It's kind of a strange thing as they seem to be more affective in some cartridges than others.
STOMP442
Gold $$ Contributor
Looks and sounds good to me. 3320 seems about right for that bullet weight in that cartridge. In my old .22-250 shooting 69gr Match Kings I was getting similar velocities with Reloader 17 so your velocities seem to be about what I would expect. Slow hits are always better than fast misses. I say shoot it and be very happy with the results you are seeing.
B23
Gold $$ Contributor
Do you want to rechamber to something else or just a different 22 CM chamber?
If you're looking for speed and it sounds like you kinda are Defensive Edge Rifles built me a 224 Terminator, their version of a 22-243 Improved. I'm using an 8tw Krieger finished at 28in shooting the 80gr ELD-M 3650fps with 48.5gr RL26. They have Redding dies and Lapua formed brass so I'll I have to do is load it up and start shooting. If you're looking for something different or faster maybe give them a call. It shoots pretty good too.
B23
Gold $$ Contributor
A bore rider throat design, unlike freebore, doesn't completely remove the lands for a specified distance it actually leaves a little bit of land height in place to slightly engrave the bullet, I believe this purpose is so the bullet can't yaw as it enters full land engagement, but does so without adding pressure so you get the benefit of freebore but without the negative affects of freebore.
I think if you were to try and go in and just remove the bore rider throat what you'd end up with would be excessive freebore which you don't want. If you want to go back to a conventional throat design you'll likely have to set the barrel back a bit and have it rechambered.
Ranger188
Silver $$ Contributor
Anytime you run a bullet's RPM's over 310 - 320,000+
it's usually just a matter of time before you see some bullet blow-ups.
When the 22 creed first came out, everyone wanted to run the heavier
bullets, well to stabilize them you had to run a fast twist. Running such
a fast twist and running them 3300 fps+ is going to cause jacket failure
after 400+ rounds caused by in part to the overbore of the 22 creed
Any fire cracking and ruff spots in the throat will harm the thin bullets.
You don't see many people rebarreling a 22 creed for the heavy bullets
just going to a lighter one with a slower twist for hunting purpose.
Some are looking at a case with a little less powder, 22x47, 22BR, 22GT
and such.
it's usually just a matter of time before you see some bullet blow-ups.
When the 22 creed first came out, everyone wanted to run the heavier
bullets, well to stabilize them you had to run a fast twist. Running such
a fast twist and running them 3300 fps+ is going to cause jacket failure
after 400+ rounds caused by in part to the overbore of the 22 creed
Any fire cracking and ruff spots in the throat will harm the thin bullets.
You don't see many people rebarreling a 22 creed for the heavy bullets
just going to a lighter one with a slower twist for hunting purpose.
Some are looking at a case with a little less powder, 22x47, 22BR, 22GT
and such.
Peterson Cartridge published 80.5 Berger data for .22 Creedmoor with 2 different 24" barrels. They only managed 3300fps at 62,000psi with two powders much slower than your 4831sc. Use a slower powder if you want more velocity with less pressure. You probably have enough room for a max pressure charge of Retumbo or Re23.
This is where twist comes in. Many guys feel they need a 7 twist to run 80-90 grain bullets in these big case .224 guns. Not true. An 8 twist and a little elevation gets the 90 stabilized and still runs 70-90s without blowups. I'm getting into the 3500s with 80s in my 22-250AI with an 8 twist barrel and never lost a 69-80 grain bullet yet. I don't shoot 90s much so can't speak about them however they do stabilize in my 8 twist at 1500' ASL.
I am on my 3rd 22Creedmoor barrel and FWIW all the info above has been spot on from my experience.... which is not always the case when it comes to wildcats that there is little published tested data on.
OP your 28 inch barrel should maybe do a little better but not much with H4831...as I mentioned above playing with some other powders will probably get some gains. Reloder 26/ N 565/ 4000 MR/ 6.5 Staball have all gave me better velocity than H4831. I have lost count of powders I have tried but 8-10
I too am ready to get after the coyotes as that’s pretty much all I use mine for except an occasional doe cull day.
OP your 28 inch barrel should maybe do a little better but not much with H4831...as I mentioned above playing with some other powders will probably get some gains. Reloder 26/ N 565/ 4000 MR/ 6.5 Staball have all gave me better velocity than H4831. I have lost count of powders I have tried but 8-10
I too am ready to get after the coyotes as that’s pretty much all I use mine for except an occasional doe cull day.
You may just have a slow barrel and you won't be able to make it do something it won't. If it bothers you, I'd say get a new barrel made and put this one on a the shelf for later, cause it clearly shoots!
My 22BR in a 28" barrel with take the 85.5 Hybrid to 3300fps with RL-17 but the accuracy up there sucks and this barrel is faster than most. It runs them much better slowed down to 3100fps and using IMR-4350 instead. Just a data point from my experience to consider.
If you're wanting more speed, there was an old member on here (Fredo) who put together what was essentially a 22-7mm SAUM and called it a 220 Redline. https://forum.accurateshooter.com/threads/gentlemen-i-present-the-220-redline.3934327/ He was shooting the 75 ELD at 3750fps. It's a really fun read!
My 22BR in a 28" barrel with take the 85.5 Hybrid to 3300fps with RL-17 but the accuracy up there sucks and this barrel is faster than most. It runs them much better slowed down to 3100fps and using IMR-4350 instead. Just a data point from my experience to consider.
If you're wanting more speed, there was an old member on here (Fredo) who put together what was essentially a 22-7mm SAUM and called it a 220 Redline. https://forum.accurateshooter.com/threads/gentlemen-i-present-the-220-redline.3934327/ He was shooting the 75 ELD at 3750fps. It's a really fun read!
AlNyhus
Silver $$ Contributor
What is the case neck diameter with a seated bullet?
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