Hard bolt closing for .284 vs easy for the Shehane

[TAJ45]

I just read here the interview re Henry Pasquet and his 1000yd 2013 win. He mentions that the 284 Win has a much harder bolt closing than the 284 Shehane he shoots.
I encountered the same feel at a clinic recently, empty chamber, dry firing, SEB, rear bag, all up. This .284Win rig belonged to a First place finisher at a national shoot, 2016.
I can not reconcile that physically or mathematically with two guns properly smithed, properly ground reamers, which would certainly be the case for both gents.
Hep me out here please. It just seems counter intuitive. What do I not know?

 

[carlsbad]

If you are dry firing, then it doesn't matter what cartridge. You could even swap bolts in the guns and the bolt closing force required is all in the bolt.

Variables:
Spring rate.
height of the detent
cocking ramp slope
lubrication
threads and thread lubrication
? did I miss anything?

--Jerry

 

[TAJ45]

If you are dry firing, then it doesn't matter what cartridge. You could even swap bolts in the guns and the bolt closing force required is all in the bolt.

Variables:
Spring rate.
height of the detent
cocking ramp slope
lubrication
threads and thread lubrication
? did I miss anything?
--Jerry

OK, looks like I need some tutoring or a gunsmithing school.
1). Spring rate = firing pin? - assuming cock on close?
2). Detent hgt.....At a total loss here
3). Cocking ramp slope - I feel I understand
X work being done over varying distance
4). Thds & lube - what threads are being rotated with bolt closing?
Thanks for the reply Jerry.

 

[carlsbad]

OK, looks like I need some tutoring or a gunsmithing school.
1). Spring rate = firing pin? - assuming cock on close?

Yes, firing pin spring. cocking.

2). Detent hgt.....At a total loss here

When you cock the firing pin ramp brings the firing pin back and then it falls into a well where is stays when cocked. I call the bump between the well and ramp the detent.


3). Cocking ramp slope - I feel I understand
X work being done over varying distance

Right. Steeper slope means harder cocking. Some rifles are short throw bolts so they have a steeper slope. Most are standard and match the original remington.

4). Thds & lube - what threads are being rotated with bolt closing?

the threads on the firing pin assembly (bottom of the shroud) that screw into the bolt when you put the bolt together rotate when the bolt is cocked. Make sure these threads are well lubed.



Thanks for the reply Jerry.

 

[TAJ45]

I capuche and thanks for the patient, quality reply.
Now, I guess my next "Why" will fall into a large grey area of assuming two very top flight competitors would be working with such different mechanical characteristics.