Notching the feed lips on a Tikka

[Trakker]

I have a Tikka T3 and enjoy shooting the 300 Win Mag out of it.
I have a question regarding the notching of the feed ramp that some people do - I believe it is to take advantage of the MAX OAL in the magazine.

It looks like I can get another 0.100" of length from the magazine, the mag well is too short.
Has anyone does this and to what rifle?
Does it really weaken the action?

[waveslayer]

Haven't seen that done, look into a chassis system with CIP mag length

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[Trakker]

I have a chassis system already and run aics magazines. The feed ramp in the receiver limits the length of the cartridge.


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[mike.h]

Before doing this, find out what shoots best. Do you need the extra 0.1000? or can you build a reliable reload without modifying you T3.

[ar15barrels]

I have a question regarding the notching of the feed ramp that some people do - I believe it is to take advantage of the MAX OAL in the magazine.

It looks like I can get another 0.100" of length from the magazine, the mag well is too short.
Has anyone does this and to what rifle?
Does it really weaken the action?

I think your terminology is off.
If you are running an AICS magazine, your magazine is the length limiting factor for the cartridges IF the receiver has been notched.
When the receiver has not been notched, then the reciever can get in the way, requiring you to run shorter OAL to get the bullet tips to clear through the receiver's bottom port.

A lot of actions have this same problem when installing detachable box magazines and it's primarily related to where the magazine needs to be located under the action without cutting the bottom port bigger.
If the magazine location were moved rearward under the action so that the action does not overlap the lower port, the ammo could be used full length.
Unfortunately, because the action was never intended to accept AICS magazines, you would have to machine the rear of the port to locate the magazine properly.
Nobody likes to machine their receivers so the DBM manufacturers all move the magazine forward under the reciever. so that no machining in the rear is necessary...

Notching does not significantly weaken the action as the feedramp area is already pretty thin and is not significantly contributing to the lower lug abutment's strength.

[ar15barrels]

Haven't seen that done, look into a chassis system with CIP mag length

It's the Tikka receiver that's the length limiting factor once you have CIP mags.
A Tikka T3 won't fit a CIP length mag through the bottom port in the reciever.

Here is an illustration that shows the problem:


The illustration is incorrectly labeled "feedramp" where it should say "receiver".

[pacrat]

I have no experience with Tikka rifles. And am only replying directly to these 2 questions.

[1] ... Has anyone does this and to what rifle?
[2] ... Does it really weaken the action?

[1] ... Yes, Mauser m98. And [2] ... Agree with Randall.

Notching does not significantly weaken the action as the feedramp area is already pretty thin and is not significantly contributing to the lower lug abutment's strength.

Some countries went much further, and NOTCHED the entire receiver for longer cartridges, including the top of the receiver ring. As illustrated in this vid. about re-arsenaled Turk mausers.

https://youtu.be/cD4FMEjiK5s

BTW .... ALL of Roy Weatherby's early magnum rifles, going back to IIRC, 1947/48, were built on Mauser actions. And the ramps were shortened to accommodate the WAY LONGER cartridges.

[waveslayer]

It's the Tikka receiver that's the length limiting factor once you have CIP mags.
A Tikka T3 won't fit a CIP length mag through the bottom port in the reciever.

Here is an illustration that shows the problem:


The illustration is incorrectly labeled "feedramp" where it should say "receiver".

What about RedSnake's bottom metal for Tikka allows 3.716" COAL to fit... how are they doing that if it hits the feed ramps?

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[ar15barrels]

What about RedSnake's bottom metal for Tikka allows 3.716" COAL to fit... how are they doing that if it hits the feed ramps?

I am not familiar with that specific bottom metal, but it probably requires cutting the action or the back of the magazines.
Ask the manufacturer to explain it.

[waveslayer]

I am not familiar with that specific bottom metal, but it probably requires cutting the action or the back of the magazines.

Ask the manufacturer to explain it.

They say drop in, interesting, there's a northern chassis that says drop in as well to improve OAL

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[ar15barrels]

They say drop in, interesting, there's a northern chassis that says drop in as well to improve OAL

Maybe they figured out how to move the magazine back and open the back of the magazine so it does not hit the reciever or they are using one of the AI mags that is already cut that way and positioning it properly to clear the reciever.

The action and chassis can be "drop in" but require modifications to mags.

[waveslayer]

Maybe they figured out how to move the magazine back and open the back of the magazine so it does not hit the reciever or they are using one of the AI mags that is already cut that way and positioning it properly to clear the reciever.



The action and chassis can be "drop in" but require modifications to mags.

I love modifications to mags, just so the shoulders on some bigger 30's will fit.

Or everyone can get a DT and not have to worry about mags and OAL

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