300 WSM FreeBore length for Tikka Custom?

[Timgunner]

I'm building a 300wsm custom off of a Tikka T3 to take advantage of the medium magazine length. I am wondering if there is a sweet spot for this cartridge as far as freebore or throat length? I'm planning on shooting the big Hornady 225 Eldm or 230 Atip bullets.

 

[rsmithsr50]

does a max mag length round, still have the bullet dia below the case shoulder ?

 

[dmoran]

@Timgunner
Below is a 300-WSM loaded round in a Tikka T3 clip with a Berger 190-VLD seated at an OAL of 2.860".
The two sectioned cases and bullets below it are a Berger 175's.
As can be seen, the T3 300-WSM clips do not have much room for long bullets.

 

[dmoran]

@Timgunner
And below is a cartridge schematic I generated of the Berger 190-VLD seated to a COAL of 2.860"

 

[Timgunner]

I should have mentioned that I am running the tikka long action magazines with a long action bolt stop. I don’t know why in the world tikka uses shortened magazines for their WSM chamberings?

 

[Timgunner]

It looks like the long action magazine will allow a Cartridge OAL of roughly 3.25” which is a huge increase over the short action magazines

 

[FeMan]

I should have mentioned that I am running the tikka long action magazines with a long action bolt stop. I don’t know why in the world tikka uses shortened magazines for their WSM chamberings?

I would make a dummy round with the the two bullets with the base at the case neck/shoulder junction. Measure the CBTO on each, and order a reamer with 0.020" or so more freebore of the longest one. I would however check dummies rounds made with a few other good LR bullets. You don't want to order a reamer that accommodates only one bullet and find that you don't like it and the other bullets are too far off the lands for you. That case seems a little small to me to be optimal with 225s, but I haven't checked it out so maybe its ok.

I am running the same thing in my factory Tikka T3 300wsm. It allows me to shoot any bullet I want. I found I had to sand down the inside of the Tikka factory LA mags a few thousandths. The factory short mags were a little fatter. Once I stuck more than one wsm round in the factory LA mags, they would bind and create feeding issues. If you pop the bottom off and remove the follower, you can easily access the inside and create any extra "room" if needed. It did not take much.

 

[Timgunner]

I would make a dummy round with the the two bullets with the base at the case neck/shoulder junction. Measure the CBTO on each, and order a reamer with 0.020" or so more freebore of the longest one. I would however check dummies rounds made with a few other good LR bullets. You don't want to order a reamer that accommodates only one bullet and find that you don't like it and the other bullets are too far off the lands for you. That case seems a little small to me to be optimal with 225s, but I haven't checked it out so maybe its ok.

I am running the same thing in my factory Tikka T3 300wsm. It allows me to shoot any bullet I want. I found I had to sand down the inside of the Tikka factory LA mags a few thousandths. The factory short mags were a little fatter. Once I stuck more than one wsm round in the factory LA mags, they would bind and create feeding issues. If you pop the bottom off and remove the follower, you can easily access the inside and create any extra "room" if needed. It did not take much.

Thanks for all the helpful tikka info!

 

[No i deer]

Are you sure a 300wsm case will fit in a tikka long action mag..
I've got a 284 built on a T3 long action which has loads of room on the length but I'm not sure that fat 300wsm case will fit in..
I will try a 7mm saum case later

 

[No i deer]

My T3 5 shot mag was originally from a Tikka T3 in 25-06. I had it rebarreled to 6.5-06 then into a 284 which will only hold 4 x 284 cartridges..
The internal measurement is 3.374 and I just tried a 7mm saum case inside and it touches the sides and wouldn't work properly..
Not sure how different the 7mm saum and the 300wsm are..!!
You may need a mag from a Tikka T3 that was chambered in 300wsm unless you intend on using different bottom metal..
I hope this helps...
Atb No I deer

 

[FeMan]

Are you sure a 300wsm case will fit in a tikka long action mag..
I've got a 284 built on a T3 long action which has loads of room on the length but I'm not sure that fat 300wsm case will fit in..
I will try a 7mm saum case later

Yes, the 300wsm fits with a little sanding on the sides as stated above with length to spare touching the lands. The 284 fits with no mag mods. The Tikka factory 300 WSM mags are the short action variety. They can't take the longer bullets without jamming them way into the case.

 

[No i deer]

Single feed them then...

 

[Timgunner]

This is a hunting rifle I will not be single feeding it, that’s why I’m using a Tikka instead of a Remington action.

 

[Scalloper]

I have a Tikka T3 I re-barreled in 7mm Mag shooting Berger 168 VLD's. I can get one in the chamber and one in the mag. Its a hunting rig that shoots very well so far one in the chamber was all that was needed.