75 vs 90 degree bolt travel

[Phil]

Other that the obvious rotational bolt travel, what other differences are there between the 75 and 90 degree bolt throw??

Kelbly offers them both and I’d like to get some opinions before committing to the 75 degree throw.

Phil.

 

[Jud96]

Harder bolt lift on a 75 degree bolt. You’re compressing the same spring the same distance but with a shorter bolt throw

 

[ShtrRdy]

Less locking lug contact area, I think.

 

[Judd]

I’m pretty sure the reason they make them is some of the smaller objective scopes can be mounted low enough the bolt handle will hit them. I know a buddy of mine had that exact issue with a Defiance.

 

[Kracken McGraw]

Any more opinions on this?
Defiance Machine is offering both of these options now on their actions.

 

[Ruger15151]

Harder bolt lift on a 75 degree bolt. You’re compressing the same spring the same distance but with a shorter bolt throw

What he said ... exactly! ^^^^^^

 

[Jud96]

I will say, I don’t know about other manufacturers. But Pierce is making a 75 degree bolt now for their actions and I worked on making the top of the cocking ramp much more of a radius and it’s not ugly to open. I compared the old 90 degree bolt side by side to a 75, both with 24lb springs and it was hard to notice the difference when both actions were in a stock. I personally think for everything besides benchrest, I’d go 75 degree.

 

[Jonnyofalltrades]

I will say, I don’t know about other manufacturers. But Pierce is making a 75 degree bolt now for their actions and I worked on making the top of the cocking ramp much more of a radius and it’s not ugly to open. I compared the old 90 degree bolt side by side to a 75, both with 24lb springs and it was hard to notice the difference when both actions were in a stock. I personally think for everything besides benchrest, I’d go 75 degree.

By "radius" do you mean that the movement of the cocking piece up the cocking ramp slope is not linear? (Sorry, I'm having a hard time describing what I mean.)
I've recut a few ramps, and have spent way too much time daydreaming how to reduce bolt lift.
I could imagine that if the ramp had less aggressive slope at the portions of travel that usually feel harder...

 

[Jud96]

By "radius" do you mean that the movement of the cocking piece up the cocking ramp slope is not linear? (Sorry, I'm having a hard time describing what I mean.)
I've recut a few ramps, and have spent way too much time daydreaming how to reduce bolt lift.
I could imagine that if the ramp had less aggressive slope at the portions of travel that usually feel harder...

At the very top of the ramp where it ends it’s radius’d instead of being an abrupt sharp corner. The ramp is linear, but right before the cocking piece rotates out of the ramp and into the retaining notch there’s a rounded corner. It’s not drastic, but it improved the bolt lift.

 

[choprzrul]

Anything that gives me more room between the bolt handle and the scope with a gloved hand out hunting is a good thing....so I have Browning and Tikka hunting rifles.