deye243 wrote:Wapiti cup and core bullets are fine in a 300rum IF used for the cartridges designed purpose.
Actually you might like to enlighten me where I'm going wrong, what exactly is this designed purpose? Not being a smartarse here either.
Boring explanation coming up...
My hunting-weight 300RUM in a 26" barrel throws 150gn bullets out at 300-350fps faster than in my 24.5" 300WM's, which if shoulder shooting large boars with thick gristle shoulder shields, makes a HUGE difference in instant kills. Not talking about thin-skinned sows and half-grown things either. In fact for me, I stopped using the 300RUM until I solved this issue.
The sheer speed of the 150gn cup&core projectiles @3500+fps in the 300RUM (from using a chrony, and using 2217 or 2225 powder) sees them blow into pieces by the time they've gotten through the shoulder pad, and nothing is left but little shards that basically shotgun through the chest cavity. I'm talking conventional soft points or "protected points" here, forget about Ballistic Tips etc as they are hand grenades in the RUM. Crow bullets. The pigs take off like all hell and can run for 500m+ and can be really hard to find in our hilly and rocky gully country. Sure, they die, but I'm not into that at all.
Same projectiles in the 300WM @3200 drops them like a schoolbag at the front door, with maybe the odd issue of the above if the shou;lder bone does something weird to them. But hardly never do they move from the shot point.
Same projectile again in the 308Win, and I've often found the bullets on the offside, and they never run.
Slow the projectiles down in a smaller cased cartridge, and with cup&core bullets the instant-drop performance actually goes up.
Go over 3100-3200fps and they get a bit erratic, and at 3500+ they are failing.
I gut every pig and use it for something or someone, and there aren't any organs in there intact with cup&core, and to see the offside internal rib cage with hundreds of imbedded copper and lead pieces that sprayed everywhere sticking out inside tells the story.
Whereas the shock of one single piece mushrooming and travelling through all the broken bones makes a huge difference and an instant anchor.
The only way I've solved it is to go to up the weight, to slow them down a bit, and use only bonded-core projectiles. I've had excellent results with the Nosler Accubonds in 180gns, they do the bang,flop just like a 150-165 in a 300WM in cup&core.
I tried 165gn bonded-cores and maybe a little improvement. 180 bonded/solid is the minimum.
There's no shortage of pigs here, so I've done heaps of testing as my favourite cals all use .308 projectiles, and I drag one around every day.
I have a 28" Stiller actioned, Lilja barrelled A5 stocked monster 300RUM that shoots 250gn Matchkings with 8+MOA less drop at 1000m than my 338LAP with 250's, at the same muzzle velocity. Incredible cartridge, worth playing with.
So that's why I'm trying the solid copper projectiles. They are actually cheaper, posted to my door, than American Accubonds that I have to chase stock all over the place, if I can even get any, and an Aussie is making them.
Maybe, the designed purpose for the 300RUM is much heavier bullets than 180, 200-220 perhaps to up the mass to slow them down. But then, what's the point? Fun I guess.