219 Zipper Imp

[WANTASHOOT]

I have been researching some load data for the 219 zipper improved. Keep finding loads for IMR3031 and IMR4320. I don't currently have either. Would anyone know how to convert to Varget based on a quick look it appears Varget and IMR4320 are similar. Do I just back down 10% or is there a formula etc.. or if any of you have this cartridge and have worked up a load with Varget and would share, that info would be amazing.

 

[Webster]

I have been researching some load data for the 219 zipper improved. Keep finding loads for IMR3031 and IMR4320. I don't currently have either. Would anyone know how to convert to Varget based on a quick look it appears Varget and IMR4320 are similar. Do I just back down 10% or is there a formula etc.. or if any of you have this cartridge and have worked up a load with Varget and would share, that info would be amazing.

The Sierra Reloading manual list loads for the 219 Zipper for 4320. 4320 is listed next to Varget in the burn rate chart. 3031 is a lot faster burning. Sierra has data for the 219 Donaldson Wasp for 3031. I don't see any loads for Varget for any smaller cartridges. PM if you want me to sent data from the manual.

 

[WANTASHOOT]

If anyone cares I went with 26grns of Varget which is also the starting Load for IMR4320 and there were no pressure signs, will work up from there.

 

[WANTASHOOT]

I have continued my efforts one more tiny step. I went all the way to 31.5gr of Varget today with no pressure signs. Got some really nice groups at 30.5 and 31.5. Couple pulled shots in those groups, I was having trouble flinching cause the eye relief is so short the scope was hitting my safety glasses.