The Firing Line Forums - View Single Post - 250- 3000 and other quarter bores

std7mag · October 13, 2021, 07:38 AM

Hoofmender,

What bullet weights & powder burn range are you using in the 257 Roberts AI?
I recently built one on a Savage 111.
I'm trying to use the 115-120gr bullet weights.
Did a ladder test with 120gr Sierra HPBT GameKings & Norma MRP powder. About same burn rate as RL22.
I'm less than happy with the MRP. Seemed too slow burning. Lots of carbon around the necks.
I'm leaning towards RL19, or Ramshot Hunter.

Has anyone tried Super Performance in the AI?
I ask because it's readily available in my area.

October 13, 2021, 07:38 AM	#85
std7mag Senior Member Join Date: June 23, 2013 Location: Central Taxylvania.. Posts: 3,609	Hoofmender, What bullet weights & powder burn range are you using in the 257 Roberts AI? I recently built one on a Savage 111. I'm trying to use the 115-120gr bullet weights. Did a ladder test with 120gr Sierra HPBT GameKings & Norma MRP powder. About same burn rate as RL22. I'm less than happy with the MRP. Seemed too slow burning. Lots of carbon around the necks. I'm leaning towards RL19, or Ramshot Hunter. Has anyone tried Super Performance in the AI? I ask because it's readily available in my area. __________________ When our own government declares itself as "tyrannical", where does that leave us??!! "Januarary 6th insurrection". Funny, I didn't see a single piece of rope...