Swift A-Frame pressure

[analog_peninsula]

Hi everyone,
Have you found it necessary to reduce your load when switching from conventional bullets (dgx, for example) to the a-frame? I’m specifically looking at the 400 grain .416.

Any data points are welcome.

 

[BourbonTrail]

I had to reduce it for brass solids, but A-Frames should use similar load data to Nosler Partitions which is on Nosler’s website. I haven’t reloaded A-Frames because I still have 2 boxes of factory Ammo (416 Rem).

 

[Wyatt Smith]

When switching any component it’s best to back off to a starting load and work up.

 

[analog_peninsula]

In answer to my original question, Norma data suggests a-frames generate slightly more pressure that standard cup and core bullets.

416 WEATHERBY MAGNUM | Reloading Data for hand loading

www.norma-ammunition.com

 

[Monski]

I forget which caliber this pertains to but I had a load with Partitions and tried the same powder charge, etc with Aframes and the velocity was the same. I mentioned this at the SCI convention to somebody while I was at the Swift booth and Swift's owner overheard me and just about lost his mind. He said that you can't do this! I remember it wasn't a max load with the Partition so figured the experiment had plenty of room for safety. That being said, the Aframes should give higher pressures than other lead core bullets and Wyatt Smith's advise should be followed.

 

[Hififile324]

Safety First! Do not guess or extrapolate based on anecdotal evidence. Use the Swift manual, start low and work up. Remember you want to be holding a rifle, not a harp!

 

[meigsbucks]

No matter the bullet, you need to work up the load. As far as Swift AF’s, I haven’t noticed an appreciable difference in what constitutes a MAX load versus other bullets. The only one I can think of is the 286gr in the 9.3x62. I can use a grain more powder with the Hornady.
I can switch to the Swift 180gr in the .30/06 and .300Wby, 225gr in the .338 RUM, 300gr in the .375 HH and 400gr in the .416 Ruger without adjusting powder charge, although accuracy and POI may vary.

 

[Jefferry404]

FYI, here is link to info and data I posted. Per Harmut Broemel, developer of QuickLoad, the shot start pressure for Swifts in about 7kpsi higher than regular copper jacket bullets.
Steve

J

Post in thread 'Need help, Load discrepancy Swift vs Hodgdon'

Apr 1, 2024

GRT shows same starting pressure for swift, talked to them about it on their discord channel because my MVs weren't anywhere near what GRT and QL say it should be, like a couple hundred fps slower than predicted

10k starting pressure is just wrong. My LD with A Frames shows them with an initial pressure of every other jacketed bullet I've ever worked loads for - 3625 psi

10k should be expected from monolithics, not from jacketed bullets.

Well, as the saying goes "a man with one watch knows what time it is but a man with 2 watches never knows" or as Bob Vyne of Motorola used to...

• Jefferry404

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