#1
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22-284
Anybody have any data for a 22-284? My project gun should be done just in time for pd season. It is going to have a 1 in 8 shilen match barrel and i want to shoot 75 grn v-max. With that being said I might also try the 60 grn nosler or some other bonded bullet for late season coyote. I really hope that it will shoot the 70 ish v-max or ballistic tip.
Thanks John Last edited by ogallala_1; 04-01-2008 at 10:53 PM. |
#2
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I have owned a few 22/284's, and they all have their own quirks. I still shoot one, currently with a 1:210mm twist polygon barrel.
A lot depends on what twist the barrel is, and what weight bullet you want to shoot. A bit more info about the rifle would be good. B. |
#3
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I would stick with a 9" twist barrel for the 22/284 if you must use the 75gn pills. If you go to 8" twist to use the 75gn A maxs, you will start to get bullets coming apart when you get the velocity up. You will then have to back off to 22/250 imp velocities to get the bullets to hang together. The 75gn A maxs will stabilize in a 9" twist at the velocities you will get out of this cartridge. Even with a 9" twist, you might start to get some of the bullets coming apart if you push it too much. The sierras (80gn MK)are a bit tougher in the jackets , but then ,these wont expand the same as the A maxs.
If I buid another of these type of rifles, I might go back to a 12" twist and shoot the 60 V maxs at 4000 fps+ |
#4
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Oh yeah, loads. 54gns of H1000 is a good starting load with 75gn bullets and 51gns of 4831sc. Standard primers, not magnum primers. Magnum primers give too high velocity spread.
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#5
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Ogallala:
You might have seen a faster reply if you had replied to my post - rather than editing your original post to answer my question. 1:8 will do fine with the A-Max. You can shoot the lighter stuff in a fast twist, but may need to back down if they blow up on the way to the target. Obviously the slower powders give good results, have had good luck with IMR 4350 & Reloader 19 - and slower powders. 220 swift max loads with slow powders usually are a good place to start developing loads for a new weapon. Currently I am shooting 60 grains of H870 with an 85 grain bullet from the 1:210 with great results. Of course, 870 is discontinued, but I have enough on hand to wear out a couple of barrels... B. |
#6
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bohika, what twist was your barrel, is it a 1:210mm? That would be about an 8.5" twist I take it. I tried the 75gn A maxs in a few 8" twist barrels, moly and non moly, but I couldnt get the velocity up above 3600 fps without them coming apart, sometimes at lower velocites than this. When I went to a 9" twist, they were still stabilized, but I could drive them quicker without them coming apart at the 200 yd line.
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#7
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CR:
Yup, 1 turn in 210mm. The polygonal bore seems to be easier on the bullet - with no sharp groove cut in the bullet they stay together a little better. Like I said, 22/284's tend to be quirky. 75 A max's in an 8 inch twist will work just fine, but much better in some barrels. I have had barrels from 1:16 to 1:8 (inches) in my 22/284's over the years, all with different results. I bought a new reamer when I started that project, and I cut only chambers for that rifle with it. Salt Bath Nitriding seems to help with barrel life. B. |
#8
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Thanks for the info, the company that is building the rifle lost there reamer and had to order a new on so now i am three more weeks out. I also have a bunch of h870 bought on clearance so i am totally excited I can use it in the 22-284
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#9
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You wouldn't have any Idea were to start with H870 and 75 grain bullet?
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#10
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Ogallala:
I am running 57 grains of H870 behind an 85 grain 12L14 bore rider right now. You should probably start down around 50 to 52 grains of H870 with a 75 grain bullet. You will need to fire your formed brass & break in the barrel a bit anyway, so start a bit low & work up. Throat & lead differences make it hard to just swap loads for these rifles. I had one barrel that would quite happily shoot 55 grain bullets parked on top of 55 grains of IMR4350. A friend tried it with a different rifle and wound up with a face full of gas & a badly extruded case head. B. |
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