Long range with the 243

[Bret4207]

Your 50/50 should bump up, if that's even needed, at moderate pressures. Just my opinion, but it never made sense to me to try and produce perfect bullets and then mash them into a blob of putty in an attempt to get them to "bump up". Your mileage may vary.

 

[BudHyett]

Do bullets bump up with linotype or a 50/50 mix, which is about a BHN of 14? Maybe a soft alloy will work. So I'd like to hear what you guys think.

I've used an alloy of 94%Pb/4%Sb/2%Sn very successfully. This was both as-cast and heat-treated. This alloy as-cast seems to "bump up" in a number of loads, working especially well in the 1700 to 1900 feet-per-second range.

I've used Monotype and heat-treated Linotype to 2300 Feet-per-second in target loads. These may be too hard as they powder when striking steel backplate where the first alloy will only squish.