| Posted: Sun Oct 25th, 2009 03:49 AM |
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TnTom
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can anyone shed information on reloading specs for the .220 Rocket in bullet weight greater than 77 gr. using a 1:8 twist barrel.
Tom
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| Posted: Sun Oct 25th, 2009 04:23 AM |
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wheezengeezer
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The rocket is a very slightly improved 220 swift ackley.220 load data will be a safe starting point for it.I am not sure but a 1 in 8 may not be good for the heavier stuff.
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| Posted: Sun Oct 25th, 2009 05:17 AM |
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TnTom
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wheezengeezer wrote: The rocket is a very slightly improved 220 swift ackley.220 load data will be a safe starting point for it.I am not sure but a 1 in 8 may not be good for the heavier stuff.
Its a little like apples and oranges. tell me if you think so. When shooting the .220 Swift, for example, the common bullet weight is about 45 gr to 60 gr with a 1:14 twist.
Sierra has a warning on the box of .224 dia 62 Gr. HPBT "for use with 1:9 twist or faster. I have learned is the slower twist will not stabilize the heavier bullet. I loaded 5 up and they hit the target sideways at 100 yds.
The .223 Rem shoots the same dia. bullet for example 69 gr - 80 gr typically in a 1:7 twist. If a bullet in the 45 - 55 gr bullet if shot in the 1:7 twist barrel it will explode before it hit the target shooting 600yds. You can see it as it travels down range. just a POOF.
The .224 dia 90 - 105 gr bullet is usually shot in a 1:6.5 twist barrel.
Most .220 Swifts are cambered in 1:14 twist barrels and most load data top out at 70 grs. And from experience I have found anything over 62 grs won't fly in a slow twist barrel.
To shoot the .220 "Rocket" at a bullet weight of greater than 69 Gr will require a twist in the 1:7 - 1:8 - 1:9 twist. I'm just not finding any load data specifically for the Swift in weights 70 gr and over.
My initial load for the Rocket is a 77 gr bullet with 31.5 gr of H-Varget. The closest .220 Swift load in the manual is 31 gr of Varget usin g a 70g using the cci-200 primer with an 3247 speed and a 59140psi.
I haven't taken it to the bench yet but I have loaded 5 rounds and would like to find some history using the heavier load and the barrel specs.
I think the only improvement of the Rocket is easier extraction. No measurable performance to speak of, so I here.
My plan is to shoot it in the 400 yd to 600 yd range with a heavier bullet as I found that is what it took to gain accuracy with the .223 Rem and I'd like to accomplish similar accuracy with the rocket.
Doesn't seem to be a lot of load history available from users.
Thanks
Tom
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| Posted: Sun Oct 25th, 2009 12:43 PM |
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choppersdad
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When it was the 220 Rocket's day to shine, most people weren't shooting the heavier bullets. They stayed with the 50-55 gr bullets and tried to make them sizzle. If your barrel is truely 1-8 then it should shoot the 77 gr. bullet o.k.
I would endeavor to find data for a standard swift using the bullet that you choose and work from there. Call Sierra and talk to one of their techs, he might have some good info for you on the swift or the AI version.
Mark
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| Posted: Sun Oct 25th, 2009 04:46 PM |
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TnTom
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I'll give them a call and see what they say. Never even thought of that.Thats I appreciate it.
Tom
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| Posted: Mon Oct 26th, 2009 01:38 AM |
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choppersdad
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TnTom wrote: wheezengeezer wrote: The rocket is a very slightly improved 220 swift ackley.220 load data will be a safe starting point for it.I am not sure but a 1 in 8 may not be good for the heavier stuff.
Its a little like apples and oranges. tell me if you think so. When shooting the .220 Swift, for example, the common bullet weight is about 45 gr to 60 gr with a 1:14 twist.
Sierra has a warning on the box of .224 dia 62 Gr. HPBT "for use with 1:9 twist or faster. I have learned is the slower twist will not stabilize the heavier bullet. I loaded 5 up and they hit the target sideways at 100 yds.
The .223 Rem shoots the same dia. bullet for example 69 gr - 80 gr typically in a 1:7 twist. If a bullet in the 45 - 55 gr bullet if shot in the 1:7 twist barrel it will explode before it hit the target shooting 600yds. You can see it as it travels down range. just a POOF.
The .224 dia 90 - 105 gr bullet is usually shot in a 1:6.5 twist barrel.
Most .220 Swifts are cambered in 1:14 twist barrels and most load data top out at 70 grs. And from experience I have found anything over 62 grs won't fly in a slow twist barrel.
To shoot the .220 "Rocket" at a bullet weight of greater than 69 Gr will require a twist in the 1:7 - 1:8 - 1:9 twist. I'm just not finding any load data specifically for the Swift in weights 70 gr and over.
My initial load for the Rocket is a 77 gr bullet with 31.5 gr of H-Varget. The closest .220 Swift load in the manual is 31 gr of Varget usin g a 70g using the cci-200 primer with an 3247 speed and a 59140psi.
I haven't taken it to the bench yet but I have loaded 5 rounds and would like to find some history using the heavier load and the barrel specs.
I think the only improvement of the Rocket is easier extraction. No measurable performance to speak of, so I here.
My plan is to shoot it in the 400 yd to 600 yd range with a heavier bullet as I found that is what it took to gain accuracy with the .223 Rem and I'd like to accomplish similar accuracy with the rocket.
Doesn't seem to be a lot of load history available from users.
Thanks
Tom
Actually you can get 100 or so FPS gain as well as a heck of a lot less case stretch.
Mark
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| Posted: Mon Oct 26th, 2009 03:58 AM |
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stevekoozer
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Warning! Notes: These loads were maximum in a Weatherby rifle with a 26-inch barrel, and a one-in-14-inch twist. Due to its extremely long freebore, these loads may be excessive in other rifles. This data is intended only to indicate the potential performance of the cartridge. Owners of rifles in .220 Rocket are advised to use starting loads shown in various handloading manuals for the .220 Swift and work up only if pressure signs indicate it is safe to do so. This load data was developed in Hornady .220 Swift cases after they had been fireformed to the .220 Rocket. CCI-200 primers were used in all loads with extruded powders and CCI-250 primers were used with Ball and spherical powders. Velocities represent an average of five shots measured 12 feet from the muzzle with an Oehler Model 33 Chronograph. (Handloader Issue 143)
Be Alert: Publisher cannot be responsible for errors in published load data.
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| Posted: Mon Oct 26th, 2009 05:45 AM |
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TnTom
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Thanks Steve,
I did see this and what I find puzzling is the range in bullet weight all with the 1:14 twist barrel.
It has been my experience that .224 dia bullets greater than 62 gr will not stabilize in the slower twist barrel (1:4) The performance is not good at all. Sierra has a warning on their bullets to fire 62 gr and heavier only in barrels with a 1:7 - 1:9.
I need to find load history for the Rocket with bullets weights 69 gr to 80 gr fired in a
1:8 barrel. Not much available.
I'm calling sierra to see what they suggest. Should be interesting.
thanks Again
Tom
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| Posted: Tue Oct 27th, 2009 04:12 AM |
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stevekoozer
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I would look at either of the 4831's or RL-22 for those bullet weights perhaps even Imr-7828 ssc hell ya never know H-1000 might also work. Large improved case with a small bore screams slow powder to me.
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