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  #1  
Old 12-19-2017, 01:23 AM
410gauge 410gauge is offline
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Guys, Just finished this one up. It's a 20/250 set-up to shoot the 55 gr Bergers.

Last edited by 410gauge; 09-10-2018 at 06:55 PM.
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Old 12-19-2017, 02:18 PM
Knifeman Knifeman is offline
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Great looking rig. Would be nice to know what it does at 500 yards plus!!!
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Old 12-19-2017, 03:45 PM
B23 B23 is offline
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It's a little surprising you're getting that kind of results shooting the 55's out of a 1-10tw. Curious, what elevation are you shooting from? I'm going to guess you're a few thousand feet above sea level which could help explain why that 1-10 is working for you but maybe not.

I have a 20-250 build it the works right now that will be finishing up a little after the first of the year but I went with a 1-8tw Krieger to be safe at all elevations.

Have you considered trying any RL16? I think RL16 will yield a little better velocity and be more temp stable than RL15.
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Old 12-19-2017, 06:55 PM
B23 B23 is offline
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Quote:
Originally Posted by 410gauge View Post
I will keep the load development to a minimum on this rd., as I don't except the barrel to go much further than 600 rds.

Agreed, these 20-250's are not going to be long with barrel life that is for sure which is why, shortly, after I had my gunsmith order the first barrel, I had him go ahead and get another one on order.
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  #5  
Old 12-19-2017, 07:36 PM
steve123 steve123 is offline
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Quote:
Originally Posted by 410gauge View Post




Guys, Just finished this one up. It's a 20/250 set-up to shoot the 55 gr Bergers. It is a rare RFD precision action RBLP, Jewell trigger, Kreiger 1:10 twist, McMillan (pillar bedded). I shot it today...(9) break-in shots cleaning after each shot...then a three shot group (picture attached). Velocity averaged 3775 fps (right in the area I was looking for). I'm hoping this will be a long range PD and GS rifle beyond 700 yds. There was a thread a few weeks ago about barrel twist with the 55 gr Berger. "So far" it looks like the 10-twist Kreiger will work. I need to do more testing at longer ranges to see if these bullets stay stabilized at the longer ranges. It needs to warm up here though...pretty cool today LOL! 410gauge
I used to have 2 RFD's. Be careful with pressures because the bolt faces are soft causing them to peen in making the firing pin stick.

Bob Dodd still owes me $150 bucks which he refused to pay back, speaking of paybacks, lol.

Keep us posted how the bullets are holding together in about 300 rounds.

Looks like a shooter, is the good news!
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Old 12-20-2017, 02:32 PM
steve123 steve123 is offline
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steve123, a very interesting comment about the bolt-face on the RFD. Opened up the bolt-face .003" to work the Lapua brass a little better. Could barely cut it with a carbide tool. Squealed like a pig. Seemed harder than the hubs of h--l! I've had a couple of light firing pin strikes. Changing primers to see if that helps. Only have (16) rds through it, so I'm kinda feeling my way along. Haven't seen any peening of the bolt-face so far. It's been a interesting project. As I'm sure you are well aware (having owned a couple of them)...it takes some pretty good concentration just to get the bolt into the receiver. A very smooth action in my opinion. Thanks for the info. 410gauge
Back then, It could be that the pressures that the 6x47l cases could handle caused the problem I had??? It's VERY!!! hard to tell when to stop putting more powder in because the primers were only slightly flat and no ejector smear/no ejector present, and bolt not sticky yet. Later on, when I bought a chrono, that load was 3250 fps/105gr out of a 29" barrel, so pretty high pressure.

When I wanted a repeater for tactical matches I sold them. I bought a M700 and had to back off pressure until I got Gre-tan to bush the bolt, then back to higher pressure with 115's at 3000 fps.

My load now is at 3172 fps in a 28" using a Mausingfield action. The Mausingfields have a super hard bolt head so I don't expect problems.

With 22-250 brass, the brass will let you know about pressure sooner than the x47L brass will so you'll probably be fine.

But that's interesting the RFD bolt was hard, maybe he used harder steel once he realized there was a problem, don't know.

Yes, other than that the RFD's were a nice action. Bob, not so much.
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  #7  
Old 12-21-2017, 02:10 PM
L.Sherm L.Sherm is offline
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Nice to see RL15 worked for you Dave. Theres alot of debate about what twist for the 55"s you and I have spoke about it. My 9 works awesome. My personal feeling is a 9 is plenty for the big 20's if you need a faster twist for a slower 20 then a 39-40 would be a better fit because the velocity loss versus B.C gain is a wash or loss unless of course you just wanna do it. Anyway just my 2 cents.
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Old 03-07-2018, 10:48 PM
Alycidon Alycidon is offline
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Quote:
Originally Posted by L.Sherm View Post
Nice to see RL15 worked for you Dave. Theres alot of debate about what twist for the 55"s you and I have spoke about it. My 9 works awesome. My personal feeling is a 9 is plenty for the big 20's if you need a faster twist for a slower 20 then a 39-40 would be a better fit because the velocity loss versus B.C gain is a wash or loss unless of course you just wanna do it. Anyway just my 2 cents.
1 in 9 Bartlein with 39gr SBKs works great for me at about 3700.

A
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Old 07-07-2018, 10:11 PM
Dan Brothers Dan Brothers is offline
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WOW.. those are some very long pokes for a PD size target..... but I never doubt the ability of the 20-250...GOTTA LOVE'EM


https://photos.google.com/u/1/photo/...wfgtMChwijp2ND
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  #10  
Old 02-10-2018, 04:50 PM
DannoBoone DannoBoone is offline
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Default Rl17

Beware of the pressures of RL17! It is a pretty good powder, but it's the most
temp sensitive of any I have tried. I had unbelievable velocity differences from
cool to hot temps in a lot larger capacity case, the .25-06.
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