Vihtavuori N105 is relatively slow burning in class of handgun powders but I wouldn't use LP Magnum primers with it in summer. If you will anyway, drop down starting load for at least 10% and carefully observe for overpressure signs.
And it burns quite better in summer, I measured 50 - 80 fps higher speeds (depending on load and bullet weight) on warm days although ammo wasn't exposed to direct sunlight or left in car for hours. Too bad I didn't write down all those data.
Stay safe and take care. And don't forget to use good ballistic glasses and kevlar/spectra gloves. It's much easier &cheaper to buy a new gun than new fingers.
I am planning to chrono some of my 10mm pet loads this summer just to compare with winter numbers, will post it here.
Better be judged by twelve than carried by six.
Last edited by robert91922; 07-17-2011 at 14:06..