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  #11  
Old 02-10-2017, 09:08 AM
visiter1 visiter1 is offline
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Quote:
Originally Posted by jepp22 View Post
Why not go with a 20 Bobcat? Higher velocity, longer case life, higher "cool" factor.

what case is the 20 bobcat bassed on ? or whats the diffrence?
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  #12  
Old 02-10-2017, 01:57 PM
Bill K Bill K is offline
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Default Sako L461 20-222

That Bobcat looks like a Ackley improved, but with out the shoulder set back as Parker did for his 20-222 ai. Is that about right ? Bill K
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  #13  
Old 02-10-2017, 04:54 PM
Chuck Miller Chuck Miller is offline
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Default 20 Bobcat

The 20 Bobcat is a Kevin Weaver creation, basically a 222 necked to 20cal with a 40* shoulder and the sides blown out. For a single shot or bench rifle it's a good one. You'll never get it to feed from a magazine though.
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  #14  
Old 02-14-2017, 09:59 AM
Branxhunter Branxhunter is offline
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Ok, looks like I have worked out the photo posting thing. This is the donor rifle:





Marcus
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  #15  
Old 02-14-2017, 10:20 AM
Branxhunter Branxhunter is offline
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The components were sent away to Ziersch Custom Rifles in South Australia:



And a month or two later it arrived back at my LGS. I hurried it home and put it into an old varmint stock for a few snaps:








Marcus
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  #16  
Old 02-14-2017, 03:17 PM
Bill K Bill K is offline
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Default Sako L461 20-222

Looks like it will turn into a very fine weapon too use on the critters. Now for more, follow up, photos of the rifle and the critters it takes down. Bill K
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  #17  
Old 02-14-2017, 04:47 PM
visiter1 visiter1 is offline
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cant wait to here how it does mate
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  #18  
Old 02-14-2017, 05:13 PM
jds jds is offline
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I guess the Bobcat doesn't interest me on this particular rifle because I want to keep in the "mild" zone. If I hadn't already had all the 222 stuff, I probably would have gone with Vartarg.

I've already got a 22 BR if I want to ramp things up, and a 218 Bee, if I want to get way down. I think the Plain Jane will be a good compromise between the two.

I just ordered an old 40X rimfire stock from Numrich, that I may use for this build if it's decent enough. Still have about a month to wait for my barrel.jd
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  #19  
Old 02-14-2017, 08:54 PM
Branxhunter Branxhunter is offline
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I use Australian ADI powders for my reloading as they are more widely available here, and they have a reputation for being fairly stable over a range of temperatures.

I started by using AR2207, which is equivalent to Hodgdon H4198. The front of the ADI reloading book has an equivalence chart in it:

http://www.adi-powders.com.au/handlo...quivalents.asp

I am using 32gn v-maxes in this rifle. Brass is Winchester .222 that has been run through an Redding FLS S-type die with a .227" bush. I just use my old Super Simplex press with .222 seating die to seat the z-maxes.

I started by using CCI small rifle primers with a reasonably mild load and saw some flattening. After discussions with a couple of friends I have switched to Remington BR small rifle primers and the flattening disappeared.

In all I shot thirteen 4 shot groups with AR2207 for an average group size of 0.57".

After some more valued input I tried the slightly slower Benchmark 1 (BM1), which doesn't seem to have a US equivalent. The ADI comparison chart suggest N133 is the closest match, which from Fireball's various posts seems to be a good thing in this case. The rifle really started to shine. I have shot ten 4 shot groups with charges of BM1 ranging from 22.0gns up to 24.7gns (fills about 2/3 up the neck, with the only pressure sign being a very slight cratering on primers) for an average group size of 0.45". A lot of the groups included one annoying driver-induced flyer - if I ignored those and took the overall average for the best 3 shots of each group it is 0.20".

I'll add some more details around velocities over the chrony and post some pics up tonight (hopefully),

Marcus
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  #20  
Old 02-15-2017, 01:36 AM
Branxhunter Branxhunter is offline
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These were some of the BM1 load development groups:









More to follow.

Marcus
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