Home Forums Reloading Reloading Software Load Data .338 win mag 225 gr. Scirocco/A-Frame needed...

Can someone please share Swift's reload data for both A-frames and Sciroccos (both 225 grain) utilizing Alliant RL19 powder.... Alliant's website provides very few examples... Thank you...

Not Swift data, but Speer has recently put out some new data and they have RL19 as giving the most velocity in the 338 WM with 225 grain bullets.

https://www.speer-ammo.com/download...er_338_dia/338_Winchester_Magnum_225.pdf

The Swift Manual #1 shows 65.1g of RL-19 at 2465fps and 70g at 2715fps from a 24" barrel.

This is for the A-Frame

Wow, quite a difference between Swift data and Speer data. Speer has 74 to 78 grains for a max velocity of 2944 fps. Granted it's for different bullets but still I'm surprised the Speer bullet is able to get 229 fps more than the same weight Swift A Frame.

Thanks for all of the replies....

I thought I read somewhere that there are higher pressures generated with the A-Frames compared to other similar weight bullets.....something to do with with the metal composition of the outer cup..... which would explain the need for less powder for similar weights.... Glad I asked as I'm VERY new to reloading and a little nervous at this time

Thanks again....

Yeah, well different max powder charges for different bullets makes sense but I'd still think you should be able to get similar velocity with either bullet, since more pressure should correlate to more velocity.

Guys,
Be vary careful when using this data and drop several grains back.
This is not intended to slander the data which will be fine "FOR THAT BULLET" which is short, with a small bearing surface. I found it could take powder charges up to 5 grains more that the 225gn Partition as a comparison because of that small bearing surface.

It was relatively easy to top 2900fps and come close to 3000fps in my paddle stocked Ruger of the day, but the old adage of start low and work up is prudent with using Speer Data that is applied to this bullet.
Let me repeat, this data is for the Speer 225gn Boat Tail bullet.

John

I know I'm late for this post but I have loaded for the 210gr Swift Sirocco II and found that do to longer bearing space and different jacket metal that Swift bullets develop high pressure quickly and powder charges should never be shared from other manufactured bullets.

I've had the same experience with Swift 225 gr. A frames generating higher pressure in my 338 as well. I shoot the 225 Gr. Nosler Partition. When I tried working up a load with the same weight A frame I ran into pressure signs long before I reached the same powder charge as the partition.

I shoot 74.0 grains with my 225 grain North Forks in my 1968 Sako, Bofors steel. The NF obviously has much less bearing surface than the Swift. I took it up to 76 grains with zero issues, but she showed a strong preference for 74, getting right at 2800 fps. Because of the differences in bearing surfaces, I’d certainly heed Aussie’s suggestions.

Yes, the A-Frame's drag through the rifling seems to be greater than other bullets. Maybe if Swift added more grooves to the A-Frame, then velocity could be increased. But as it is now, just follow the Switft reloading data. The Swift factory loads with the 210-grain Scirocco (tipped) is a little over 2,800 fps.

Probably because of the same reasons, all A-Frame bullets are loaded by Swift's data around 75 fps slower than other bullets. For example, below 2,600 fps for the .338, 250-grain A-Frame. It is the same for all other cartridges.