I have never reloaded or shot the barnes bullets, but want to give them try. I am wondering if there is any advantage to going to anything other than the lightest weight per caliber. I understand that heavier grain bullets will carry more energy, but with a bullet with a high weight retention, like the barnes, wouldn't you need the higher velocity for it to expand? These will be a deer load, but wouldn't the same hold true fro larger animals, as well? Thanks
It really depends on the caliber and the bullet weights. Lighter weight bullets in my .22-250 will go thru a brake drum at 100 yards. Lighter weight bullets in my 7mm Mag will push the brake drum deeper into the gravel pile. Will your lighter bullet have time to expand and expend it's energy, or will it go right on thru whatever it hits? Welcome to the grayest area of reloading. You can write books trying to answer this question.
When I am working up loads for my hunting rifles I rarely use a light for caliber bullet. I want the animal to expire in the most humane way as possible. BUT, you have to consider your gun, the quarry, altitude, temperature, distances, etc. A load I use for elk in E. WA may not be the load I would use for elk in N.M. The bullet I use in my .30-30 may not be the bullet I use in my 30-06 nor the bullet I would use in a 300WM.
Necchi talks about using 120 and 140 bullets in 7mm. For most of my 7mms, those are varmint weight bullets. I wouldn't even load them in my 7mm Mag, period. 140 is lightest I would use hunting deer size game. For some of 7mm caliber guns I hunt with, this is the bullet weight I would use for deer: 7TCU (150), 7x30W (140), 7BR (168), 7-08 (140), or 7x57 (150).
So, it depends on the caliber you are going to hunt with, the bullets weight you are considering, the distance you will be shooting, the firearm, etc.
Steve