packgoatguy
WKR
It also bears pointing out that this combo (the 77grtmk/223) is yardage dependent. "Form" may have taken animals out beyond 450 yards with it, but he has noted a number of times across several different threads that he recommends the tmk/223 combo out to 450 yards.I was thinking the same thing. The complete and total ignorance in his statement is staggering. A bad shot is a bad shot. A gut shot with a 300 WM isn't going to turn out much (if any) different than a gut shot with a .223 and 77 TMKs. Having seen first hand (and I'd bet anything that none of the naysayers have any experience with the 77 TMK) the devastation of the .223/77TMK combo, I would use it on any game in North America as well.
However, he further clarifies this with his own personal minimum velocity criteria of 1800fps impact velocity
"As long as I achieve 1,800fos at the range I require, I want as short as possible. If it doesn’t hit 1,800fps at range, than I go bigger cartridge"
Which he has further clarified usually correlates to a 22 inch factory length tikka 1/8 twist barrel... using 8208xbr hand loads, getting 2840fps MV.
However, if you do the math, that MV coupled with the BC of the 77gr tmk, at 450 yards is actually 2000fps impact velocity (which implies that when Form makes his recommendations, he is adding in a 200fps minimum velocity buffer). Personally, I feel more comfortable with a 2000fps minimum velocity threshold for ANY bullet I shoot, and some I would argue would need even higher minimum velocities (like some monos, which also has been pointed out a number of times here). Perhaps the tmk CAN perform adequately down to 1800fps, or even less... but anomalies are limited with a higher self imposed minimum.
So... the point here...
If your .223 has a shorter barrel length than the standard proposed here, then velocity will be reduced, and the max reliable range is reduced.
For example, if your 22inch tikka can produce 2840fps with your handloads, then a 16 inch AR barrel might only produce 2600fps with the same load... so if the max range with the 2840fps is 450 yards, then the max range to get the same impact velocity (starting at 2600fps) would be reduced to 325 yards.
However, if you are limited to factory 77tmk ammo (as many new hunters dont reload) you might only get 2750fps with your 22inch barrel, your max range by comparison is reduced to 400 yards... and the 16 inch barrel velocity is likely reduced to around 2550fps, and your max range reduces to 300 yards.
Then consider... perhaps you are like many, and you can't find 77tmk... so you decide to shoot 73eldm hornady match factory ammo. I can personally get about 2725fps out of my 22 inch tikka... which hits my 2000fps impact velocity threshold at about 375 yards at my temp/elevation... out of a 16 inch barrel, this bullet combo drops to around 2500fps... which means a 265 yard max range with a 2000fps minimum impact velocity threshold.
Of course... if you are comfortable imposing a lower minimum velocity threshold... say 1900 or 1800fps, then you can add yardage.
By comparison,
The readily available 147gr match hornady ammo out of a 6.5 creedmoor (with its much higher BC) will give you around 2700fps out of a factory tikka, which gets to 635 yards with a 2000fps minimum impact velocity threshold. If your 16 inch barrel gets 2500fps MV, then it doesn't fall below 2000fps impact velocity until beyond 465 yards.
So, yes... a 77tmk could be a good option for some... within certain yardage and velocity constraints... but other light-recoiling alternatives exist that offer ballistic advantages and extended range by comparison.
Personally, I hunt in open country out west, where an experienced shooter could reasonably expect shot opportunities out to 600 yards (my own self imposed limit) and beyond... and so if I want a shorter barreled rifle to pack around... I'm going to likely reach for one that can lob bullets with a higher BC.