Hi @caberslash
Could you tell me why, just for my own interest. I’ve got a Sako .243 and love it, but wondered what the rationale was for your statement. I’ve heard of difference in tolerances between Sako and Tikka but I’m not sure how true that is?
Thanks,
Rob
Hi Rob,
All Tikka T3/T3x are based off the same receiver, so you could order one chambered in .204 Ruger and one chambered in 7mm Rem/300 Win Mag and the receiver is the same. Bolt lengths are the same as well, but bolt faces differ for different case head diameters.
The difference in cartridge size is accommodated via a shorter/longer magazine and bolt stop.
Some see this as a benefit, as the additional (theoretical, before modification) magazine length will allow for a longer loaded round when combined with a suitable chamber, so the Tikka T3/T3x action has found it's place among many custom rifle builds.
Now, why would you want a 'mated' action length? Because there are a few cartridge families which can be sorted by length.
1. 'Intermediate' cartridges (.222, .222 Rem Mag .223 Rem, 7.62X39, with later incarnations such as 204 Ruger 6.5 Grendel, 6ARC etc.) designed primarily around 'assault' rifles (think AR15), these cartridges have found their place among varmint, benchrest and even 'big' game hunters. There is a nominal overall cartridge length of 2.260" (to fit in AR15 mags), which makes the seemingly dimunitive round fit nicely in smaller rifles, yet pack a sizeable punch when loaded specifically for bolt action rifles (no concerns about cycling under semi or fully automatic fire).
Notable actions in this category: Sako Vixen (L461/A1), Howa Mini action, CZ 527, Zastava/Interarms M85
2. 'Short Action' cartridges (think everything based off the .308 Win, 243, 260, 7mm/08 and more recently 6.5 Creedmoor and derivatives) Nominal length around 2.8" (to accommodate the AR10 platform and magazines, see a pattern here?)
Notable mentions: Remington Model 7, Sako Forester (L579/A2), Howa Short Action and Remington 700 Short Action
3. 'Long Action' cartridges (think 30-06 family, and longer magnums).
There are a few 'in-between' rounds like the 284 Win and 6.5x55 which we won't mention

Now, Sako, Howa (arguably copying Sako!) and a few other manufacturers offer rifle actions which are 'mated' to each family, roughly speaking, as above. So I can't stick a .223 magazine into a Sako 75 chambered in 308 and vice versa.
What are the benefits of this system? Weight savings on the smaller actions with a shorter bolt throw, better round feeding, theoretically (nominal) shorter lock-times. That's pretty much it.
Costs? Well, costs. It is a lot cheaper to make a 'one size fits all' rifle, especially if the accoutrement which are required to change the chambering are all plastic (barring the barrel).
When you are making a different action length for each cartridge family, the requirements also mean a different stock, magazine, bolt, firing pin assembly, and trigger-guard.
Once you handle a Tikka T3 in .223 and compare it to an action that was meant for the .223 (like a Sako Vixen), the positive differences are self-evident.
However, with the trend for rifles being used more and more from a bench/truck/bipod/tripod, the heavier weight and reduced manoeuvrability of the 'one action' concept is no longer seen as a negative, but a benefit, as it also allows rounds to be modified for a longer length, longer bullets seated further out, more powder capacity and hence greater reach (as mentioned earlier).
It also means that aftermarket components can often be made to this 'one-size-fits-all' blueprint.