I just assume that if you need to ask if it's enough gun, it probably isn't.~Muir
An interesting comment Muir.
Maybe it’s more an issue of psychology rather than physics. Confidence is everything, after all.
In terms of the physics, I was updating my Quickload files last night after several reloading sessions in prep for next year. I had some components I picked up a while ago as a job lot, so I developed a new load for the .243 Win using RL-19 and the 95gr Hornady SST, which immediately gave me 0.7MOA at 100yds, so a little bit of tweaking and I ended up at book max and an easy 0.5MOA. I also went in search of a higher accuracy node for the ProHunter load after some advice from members here, so now I have two new loads to compare against my normal mild load, in terms of terminal performance on deer. On large-ish goats, this new ProHunter load knocks them for six and exits with a 2” hole.
When I looked at this new ProHunter load compared to my other ones in .243 Win, I had a thought… what about Muir’s recent CZ 6.5 Grendel acquisition? I quite liked the look of that. I remember you saying that you thought the cartridge is a real gem for deer hunting, so I suggested to my mate yesterday that he look into it, as he’s in for a nice light recoiling deer rifle for next autumn.
Here’s how things compared – this is using chronographed numbers for my .243 Win vs. the published Hornady data for the 6.5 Grendel Black ammunition.
Howa 20” barrel .243 Win
46.3gr AR2209, Hornady V-Max 75gr*, MV 3189fps, 1,392ft-lb @ 100yds
44.0gr RL-19, Hornady SST 95gr, MV 2,985fps, 1,561ft-lb @ 100yds
40.0gr AR2209, Sierra ProHunter 100gr, MV 2,766fps, 1,404ft-lb @ 100yds
43.0gr AR2209, Sierra ProHunter 100gr, MV 2,942fps, 1,601ft-lb @ 100yds
* I don’t use this one for deer, it’s a goat load.
CZ 527 American 24" barrel 6.5 Grendel
? Powder, Hornady ELD-M 123gr, MV 2,580fps, 1,586ft-lb @ 100yds
My mild ProHunter load rarely exits on large red hinds, but fragments extensively leaving a ±50% weight base and petals against the opposing hide having destroyed the lungs. I will be curious to see what the SSTs do, as past experience suggests they will be more violent. I also assume (???) that hand loading could probably extract a bit more out of the 123gr ELD-M? I’ve no idea how the Black is loaded.
This is just a desktop study, field experience will determine the real facts for the new loads in .243 Win. But I’m pretty confident they will slay the red hinds just as effectively as the more mild load I’ve been using. I suppose, if you have to ask the question, is it enough gun, then maybe confidence is the underlying issue. The modelled physics suggests there are likely a few cartridges in the 6mm, .257, 6.5mm range that are in probably quite close to each other, in terms of energy at the point of impact, within normal hunting ranges. Ultimately, the shooter’s ability to put the right kind of projectile in the right place is what will make the difference.