(Also in Medium Bores)I have just sprung for some 175gr 7mm Swift A frames for my 7x57. I had planned to use VV data for for N160 which talks of a max load of 45.9gr for 175gr bullets in this calibre.

This sort of ties in with the Nosler partition loads which allthough not having data for VVN160 has the same data for VVN165 as the VV book.

However all the Swift data (phone conversation with technichian)seems much more conservative in general than the Nosler data - 2,300fps vs 2500fps.

Could someone just run these load combinations through Quickload to help me minimise wastage - these bullets are $2US each and I only have 50 of them.

Swift A frame 175gr spitzer
Vihtavuori VVN 160
COL - bullet seated to cannelure, haven't measured assume industry standard?

Max charge weight to give 50,000psi, likely velocity out of 24" barrel. Obviously I would work up to it.

Hope somebody can help

I am showing 46.21 gr VVN160 with 175 gr Nosler partition 284 [1.317" bullet] [3.071" OAL] in 7x57mm 24 inch gives 2544 fps and 50009 psi, 94.3% case fill below bullet.

Alternativly, 48.5 gr H4350 gives 2630 fps at 49965 psi 99.9% case below bullet fill.

Very many thanks guys.

On the range at lunch today (only 3 miles from work) 45gr at COL 3.020 gave 2430fps and 46gr gave 2463fps. I'm going to go 45.5gr.