Varanger wrote:.... Toying with the idea of changing out the stock and trigger, and having it rechambered for .260 rem......
I don't recall if you posted what caliber your Howa is, but you were looking for a 223 so that's what I assume it is.
Three issues with converting to 260...
1) re-chambering
2) boring & re-rifling barrel
3) modifying the magazine.
I had a Winchester model 70 short action carbine in 223 bored & rechambered for 250-3000 Ackley.
This is an "improved" wildcat, with the shoulder diameter & shoulder angle increased.
The boring & re-rifling was fine, the tricky part was properly modifying the magazine for the longer, fatter cartridge.
IMHO it might be a lot easier, cheaper, & more satisfactory for you to keep the Howa as is, or sell it,
and just buy another rifle in a bigger, more suitable caliber.
You said the 6.5x55 is "super common", I'm thinking it isn't too much below the 260 Rem in practical killing power.
Esp if you handload it, for a stronger, more modern bolt action rifle than the old Krag.